Initial import of statemachine branch from the old kinetic repository

36 files changed, 34531 insertions, 0 deletions

diff --git a/src/gui/graphicsview/graphicsview.pri b/src/gui/graphicsview/graphicsview.pri
new file mode 100644
index 0000000..02d9bb1
--- /dev/null
+++ b/src/gui/graphicsview/graphicsview.pri
@@ -0,0 +1,46 @@
+# Qt graphicsview module
+
+HEADERS += \
+        graphicsview/qgraphicsitem.h \
+        graphicsview/qgraphicsitem_p.h \
+        graphicsview/qgraphicsitemanimation.h \
+        graphicsview/qgraphicsscene.h \
+        graphicsview/qgraphicsscene_p.h \
+        graphicsview/qgraphicsscene_bsp_p.h \
+        graphicsview/qgraphicssceneevent.h \
+        graphicsview/qgraphicsview_p.h \
+        graphicsview/qgraphicsview.h
+
+SOURCES += \
+        graphicsview/qgraphicsitem.cpp \
+        graphicsview/qgraphicsitemanimation.cpp \
+        graphicsview/qgraphicsscene.cpp \
+        graphicsview/qgraphicsscene_bsp.cpp \
+        graphicsview/qgraphicssceneevent.cpp \
+        graphicsview/qgraphicsview.cpp
+
+# Widgets on the canvas
+
+HEADERS += \
+        graphicsview/qgraphicslayout.h \
+        graphicsview/qgraphicslayout_p.h \
+        graphicsview/qgraphicslayoutitem.h \
+        graphicsview/qgraphicslayoutitem_p.h \
+        graphicsview/qgraphicslinearlayout.h \
+        graphicsview/qgraphicswidget.h \
+        graphicsview/qgraphicswidget_p.h \
+        graphicsview/qgridlayoutengine_p.h \
+        graphicsview/qgraphicsproxywidget.h \
+        graphicsview/qgraphicsgridlayout.h
+                                       
+SOURCES += \
+        graphicsview/qgraphicslayout.cpp \
+        graphicsview/qgraphicslayout_p.cpp \
+        graphicsview/qgraphicslayoutitem.cpp \
+        graphicsview/qgraphicslinearlayout.cpp \
+        graphicsview/qgraphicswidget.cpp \
+        graphicsview/qgraphicswidget_p.cpp \
+        graphicsview/qgridlayoutengine.cpp \
+        graphicsview/qgraphicsproxywidget.cpp \
+        graphicsview/qgraphicsgridlayout.cpp
+
diff --git a/src/gui/graphicsview/qgraphicsgridlayout.cpp b/src/gui/graphicsview/qgraphicsgridlayout.cpp
new file mode 100644
index 0000000..1e21b54
--- /dev/null
+++ b/src/gui/graphicsview/qgraphicsgridlayout.cpp
@@ -0,0 +1,651 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*!
+    \class QGraphicsGridLayout
+    \brief The QGraphicsGridLayout class provides a grid layout for managing
+    widgets in Graphics View.
+    \since 4.4
+    \ingroup multimedia
+    \ingroup graphicsview-api
+
+    The most common way to use QGraphicsGridLayout is to construct an object
+    on the heap with no parent, add widgets and layouts by calling addItem(),
+    and finally assign the layout to a widget by calling
+    QGraphicsWidget::setLayout(). QGraphicsGridLayout automatically computes
+    the dimensions of the grid as you add items.
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsgridlayout.cpp 0
+
+    The layout takes ownership of the items. In some cases when the layout
+    item also inherits from QGraphicsItem (such as QGraphicsWidget) there will be a
+    ambiguity in ownership because the layout item belongs to two ownership hierarchies.
+    See the documentation of QGraphicsLayoutItem::setOwnedByLayout() how to handle
+    this.
+    You can access each item in the layout by calling count() and itemAt(). Calling
+    removeAt() will remove an item from the layout, without
+    destroying it.
+    
+    \sa QGraphicsLinearLayout, QGraphicsWidget
+*/
+
+#include "qglobal.h"
+
+#ifndef QT_NO_GRAPHICSVIEW
+
+#include "qapplication.h"
+#include "qwidget.h"
+#include "qgraphicslayout_p.h"
+#include "qgraphicslayoutitem.h"
+#include "qgraphicsgridlayout.h"
+#include "qgraphicswidget.h"
+#include "qgridlayoutengine_p.h"
+#include <QtCore/qdebug.h>
+
+QT_BEGIN_NAMESPACE
+
+class QGraphicsGridLayoutPrivate : public QGraphicsLayoutPrivate
+{
+public:
+    QGraphicsGridLayoutPrivate() { }
+    QLayoutStyleInfo styleInfo() const;
+
+    QGridLayoutEngine engine;
+#ifdef QT_DEBUG    
+    void dump(int indent) const;
+#endif
+};
+
+QLayoutStyleInfo QGraphicsGridLayoutPrivate::styleInfo() const
+{
+    static QWidget *wid = 0;
+    if (!wid)
+        wid = new QWidget;
+    QGraphicsItem *item = parentItem();
+    QStyle *style = (item && item->isWidget()) ? static_cast<QGraphicsWidget*>(item)->style() : qApp->style();
+    return QLayoutStyleInfo(style, wid);
+}
+
+/*!
+    Constructs a QGraphicsGridLayout instance.  \a parent is passed to
+    QGraphicsLayout's constructor.
+*/
+QGraphicsGridLayout::QGraphicsGridLayout(QGraphicsLayoutItem *parent)
+    : QGraphicsLayout(*new QGraphicsGridLayoutPrivate(), parent)
+{
+}
+
+/*!
+    Destroys the QGraphicsGridLayout object.
+*/
+QGraphicsGridLayout::~QGraphicsGridLayout()
+{
+    for (int i = count() - 1; i >= 0; --i) {
+        QGraphicsLayoutItem *item = itemAt(i);
+        // The following lines can be removed, but this removes the item
+        // from the layout more efficiently than the implementation of 
+        // ~QGraphicsLayoutItem.
+        removeAt(i);
+        if (item) {
+            item->setParentLayoutItem(0);
+            if (item->ownedByLayout())
+                delete item;
+        }
+    }
+}
+
+/*!
+    Adds \a item to the grid on \a row and \a column. You can specify a
+    \a rowSpan and \a columnSpan and an optional \a alignment.
+*/
+void QGraphicsGridLayout::addItem(QGraphicsLayoutItem *item, int row, int column,
+                                  int rowSpan, int columnSpan, Qt::Alignment alignment)
+{
+    Q_D(QGraphicsGridLayout);
+    if (row < 0 || column < 0) {
+	qWarning("QGraphicsGridLayout::addItem: invalid row/column: %d",
+		 row < 0 ? row : column);
+	return;
+    }
+    if (columnSpan < 1 || rowSpan < 1) {
+	qWarning("QGraphicsGridLayout::addItem: invalid row span/column span: %d",
+		 rowSpan < 1 ? rowSpan : columnSpan);
+	return;
+    }
+    if (!item) {
+	qWarning("QGraphicsGridLayout::addItem: cannot add null item");
+	return;
+    }
+
+    d->addChildLayoutItem(item);
+
+    new QGridLayoutItem(&d->engine, item, row, column, rowSpan, columnSpan, alignment);
+    invalidate();
+}
+
+/*!
+    \fn QGraphicsGridLayout::addItem(QGraphicsLayoutItem *item, int row, int column, Qt::Alignment alignment = 0)
+
+    Adds \a item to the grid on \a row and \a column. You can specify
+    an optional \a alignment for \a item.
+*/
+
+/*!
+    Sets the default horizontal spacing for the grid layout to \a spacing.
+*/
+void QGraphicsGridLayout::setHorizontalSpacing(qreal spacing)
+{
+    Q_D(QGraphicsGridLayout);
+    d->engine.setSpacing(spacing, Qt::Horizontal);
+    invalidate();
+}
+
+/*!
+    Returns the default horizontal spacing for the grid layout.
+*/
+qreal QGraphicsGridLayout::horizontalSpacing() const
+{
+    Q_D(const QGraphicsGridLayout);
+    return d->engine.spacing(d->styleInfo(), Qt::Horizontal);
+}
+
+/*!
+    Sets the default vertical spacing for the grid layout to \a spacing.
+*/
+void QGraphicsGridLayout::setVerticalSpacing(qreal spacing)
+{
+    Q_D(QGraphicsGridLayout);
+    d->engine.setSpacing(spacing, Qt::Vertical);
+    invalidate();
+}
+
+/*!
+    Returns the default vertical spacing for the grid layout.
+*/
+qreal QGraphicsGridLayout::verticalSpacing() const
+{
+    Q_D(const QGraphicsGridLayout);
+    return d->engine.spacing(d->styleInfo(), Qt::Vertical);
+}
+
+/*!
+    Sets the grid layout's default spacing, both vertical and
+    horizontal, to \a spacing.
+
+    \sa rowSpacing(), columnSpacing()
+*/
+void QGraphicsGridLayout::setSpacing(qreal spacing)
+{
+    Q_D(QGraphicsGridLayout);
+    d->engine.setSpacing(spacing, Qt::Horizontal | Qt::Vertical);
+    invalidate();
+}
+
+/*!
+    Sets the spacing for \a row to \a spacing.
+*/
+void QGraphicsGridLayout::setRowSpacing(int row, qreal spacing)
+{
+    Q_D(QGraphicsGridLayout);
+    d->engine.setRowSpacing(row, spacing, Qt::Vertical);
+    invalidate();
+}
+
+/*!
+    Returns the row spacing for \a row.
+*/
+qreal QGraphicsGridLayout::rowSpacing(int row) const
+{
+    Q_D(const QGraphicsGridLayout);
+    return d->engine.rowSpacing(row, Qt::Vertical);
+}
+
+/*!
+    Sets the spacing for \a column to \a spacing.
+*/
+void QGraphicsGridLayout::setColumnSpacing(int column, qreal spacing)
+{
+    Q_D(QGraphicsGridLayout);
+    d->engine.setRowSpacing(column, spacing, Qt::Horizontal);
+    invalidate();
+}
+
+/*!
+    Returns the column spacing for \a column.
+*/
+qreal QGraphicsGridLayout::columnSpacing(int column) const
+{
+    Q_D(const QGraphicsGridLayout);
+    return d->engine.rowSpacing(column, Qt::Horizontal);
+}
+
+/*!
+    Sets the stretch factor for \a row to \a stretch.
+*/
+void QGraphicsGridLayout::setRowStretchFactor(int row, int stretch)
+{
+    Q_D(QGraphicsGridLayout);
+    d->engine.setRowStretchFactor(row, stretch, Qt::Vertical);
+    invalidate();
+}
+
+/*!
+    Returns the stretch factor for \a row.
+*/
+int QGraphicsGridLayout::rowStretchFactor(int row) const
+{
+    Q_D(const QGraphicsGridLayout);
+    return d->engine.rowStretchFactor(row, Qt::Vertical);
+}
+
+/*!
+    Sets the stretch factor for \a column to \a stretch.
+*/
+void QGraphicsGridLayout::setColumnStretchFactor(int column, int stretch)
+{
+    Q_D(QGraphicsGridLayout);
+    d->engine.setRowStretchFactor(column, stretch, Qt::Horizontal);
+    invalidate();
+}
+
+/*!
+    Returns the stretch factor for \a column.
+*/
+int QGraphicsGridLayout::columnStretchFactor(int column) const
+{
+    Q_D(const QGraphicsGridLayout);
+    return d->engine.rowStretchFactor(column, Qt::Horizontal);
+}
+
+/*!
+    Sets the minimum height for row, \a row, to \a height.
+*/
+void QGraphicsGridLayout::setRowMinimumHeight(int row, qreal height)
+{
+    Q_D(QGraphicsGridLayout);
+    d->engine.setRowSizeHint(Qt::MinimumSize, row, height, Qt::Vertical);
+    invalidate();
+}
+
+/*!
+    Returns the minimum height for row, \a row.
+*/
+qreal QGraphicsGridLayout::rowMinimumHeight(int row) const
+{
+    Q_D(const QGraphicsGridLayout);
+    return d->engine.rowSizeHint(Qt::MinimumSize, row, Qt::Vertical);
+}
+
+/*!
+    Sets the preferred height for row, \a row, to \a height.
+*/
+void QGraphicsGridLayout::setRowPreferredHeight(int row, qreal height)
+{
+    Q_D(QGraphicsGridLayout);
+    d->engine.setRowSizeHint(Qt::PreferredSize, row, height, Qt::Vertical);
+    invalidate();
+}
+
+/*!
+    Returns the preferred height for row, \a row.
+*/
+qreal QGraphicsGridLayout::rowPreferredHeight(int row) const
+{
+    Q_D(const QGraphicsGridLayout);
+    return d->engine.rowSizeHint(Qt::PreferredSize, row, Qt::Vertical);
+}
+
+/*!
+    Sets the maximum height for row, \a row, to \a height.
+*/
+void QGraphicsGridLayout::setRowMaximumHeight(int row, qreal height)
+{
+    Q_D(QGraphicsGridLayout);
+    d->engine.setRowSizeHint(Qt::MaximumSize, row, height, Qt::Vertical);
+    invalidate();
+}
+
+/*!
+    Returns the maximum height for row, \a row.
+*/
+qreal QGraphicsGridLayout::rowMaximumHeight(int row) const
+{
+    Q_D(const QGraphicsGridLayout);
+    return d->engine.rowSizeHint(Qt::MaximumSize, row, Qt::Vertical);
+}
+
+/*!
+    Sets the fixed height for row, \a row, to \a height.
+*/
+void QGraphicsGridLayout::setRowFixedHeight(int row, qreal height)
+{
+    Q_D(QGraphicsGridLayout);
+    d->engine.setRowSizeHint(Qt::MinimumSize, row, height, Qt::Vertical);
+    d->engine.setRowSizeHint(Qt::MaximumSize, row, height, Qt::Vertical);
+    invalidate();
+}
+
+/*!
+    Sets the minimum width for \a column to \a width.
+*/
+void QGraphicsGridLayout::setColumnMinimumWidth(int column, qreal width)
+{
+    Q_D(QGraphicsGridLayout);
+    d->engine.setRowSizeHint(Qt::MinimumSize, column, width, Qt::Horizontal);
+    invalidate();
+}
+
+/*!
+    Returns the minimum width for \a column.
+*/
+qreal QGraphicsGridLayout::columnMinimumWidth(int column) const
+{
+    Q_D(const QGraphicsGridLayout);
+    return d->engine.rowSizeHint(Qt::MinimumSize, column, Qt::Horizontal);
+}
+
+/*!
+    Sets the preferred width for \a column to \a width.
+*/
+void QGraphicsGridLayout::setColumnPreferredWidth(int column, qreal width)
+{
+    Q_D(QGraphicsGridLayout);
+    d->engine.setRowSizeHint(Qt::PreferredSize, column, width, Qt::Horizontal);
+    invalidate();
+}
+
+/*!
+    Returns the preferred width for \a column.
+*/
+qreal QGraphicsGridLayout::columnPreferredWidth(int column) const
+{
+    Q_D(const QGraphicsGridLayout);
+    return d->engine.rowSizeHint(Qt::PreferredSize, column, Qt::Horizontal);
+}
+
+/*!
+    Sets the maximum width of \a column to \a width.
+*/
+void QGraphicsGridLayout::setColumnMaximumWidth(int column, qreal width)
+{
+    Q_D(QGraphicsGridLayout);
+    d->engine.setRowSizeHint(Qt::MaximumSize, column, width, Qt::Horizontal);
+    invalidate();
+}
+
+/*!
+    Returns the maximum width for \a column.
+*/
+qreal QGraphicsGridLayout::columnMaximumWidth(int column) const
+{
+    Q_D(const QGraphicsGridLayout);
+    return d->engine.rowSizeHint(Qt::MaximumSize, column, Qt::Horizontal);
+}
+
+/*!
+    Sets the fixed width of \a column to \a width.
+*/
+void QGraphicsGridLayout::setColumnFixedWidth(int column, qreal width)
+{
+    Q_D(QGraphicsGridLayout);
+    d->engine.setRowSizeHint(Qt::MinimumSize, column, width, Qt::Horizontal);
+    d->engine.setRowSizeHint(Qt::MaximumSize, column, width, Qt::Horizontal);
+    invalidate();
+}
+
+/*!
+    Sets the alignment of \a row to \a alignment.
+*/
+void QGraphicsGridLayout::setRowAlignment(int row, Qt::Alignment alignment)
+{
+    Q_D(QGraphicsGridLayout);
+    d->engine.setRowAlignment(row, alignment, Qt::Vertical);
+    invalidate();
+}
+
+/*!
+    Returns the alignment of \a row.
+*/
+Qt::Alignment QGraphicsGridLayout::rowAlignment(int row) const
+{
+    Q_D(const QGraphicsGridLayout);
+    return d->engine.rowAlignment(row, Qt::Vertical);
+}
+
+/*!
+    Sets the alignment for \a column to \a alignment.
+*/
+void QGraphicsGridLayout::setColumnAlignment(int column, Qt::Alignment alignment)
+{
+    Q_D(QGraphicsGridLayout);
+    d->engine.setRowAlignment(column, alignment, Qt::Horizontal);
+    invalidate();
+}
+
+/*!
+    Returns the alignment for \a column.
+*/
+Qt::Alignment QGraphicsGridLayout::columnAlignment(int column) const
+{
+    Q_D(const QGraphicsGridLayout);
+    return d->engine.rowAlignment(column, Qt::Horizontal);
+}
+
+/*!
+    Sets the alignment for \a item to \a alignment.
+*/
+void QGraphicsGridLayout::setAlignment(QGraphicsLayoutItem *item, Qt::Alignment alignment)
+{
+    Q_D(QGraphicsGridLayout);
+    d->engine.setAlignment(item, alignment);
+    invalidate();
+}
+
+/*!
+    Returns the alignment for \a item.
+*/
+Qt::Alignment QGraphicsGridLayout::alignment(QGraphicsLayoutItem *item) const
+{
+    Q_D(const QGraphicsGridLayout);
+    return d->engine.alignment(item);
+}
+
+/*!
+    Returns the number of rows in the grid layout. This is always one more
+    than the index of the last row that is occupied by a layout item (empty
+    rows are counted except for those at the end).
+*/
+int QGraphicsGridLayout::rowCount() const
+{
+    Q_D(const QGraphicsGridLayout);
+    return d->engine.effectiveLastRow(Qt::Vertical) + 1;
+}
+
+/*!
+    Returns the number of columns in the grid layout. This is always one more
+    than the index of  the last column that is occupied by a layout item (empty
+    columns are counted except for those at the end).
+*/
+int QGraphicsGridLayout::columnCount() const
+{
+    Q_D(const QGraphicsGridLayout);
+    return d->engine.effectiveLastRow(Qt::Horizontal) + 1;
+}
+
+/*!
+    Returns a pointer to the layout item at (\a row, \a column).
+*/
+QGraphicsLayoutItem *QGraphicsGridLayout::itemAt(int row, int column) const
+{
+    Q_D(const QGraphicsGridLayout);
+    if (row < 0 || row >= rowCount() || column < 0 || column >= columnCount()) {
+        qWarning("QGraphicsGridLayout::itemAt: invalid row, column %d, %d", row, column);
+        return 0;
+    }
+    if (QGridLayoutItem *item = d->engine.itemAt(row, column))
+        return item->layoutItem();
+    return 0;
+}
+
+/*!
+    Returns the number of layout items in this grid layout.
+*/
+int QGraphicsGridLayout::count() const
+{
+    Q_D(const QGraphicsGridLayout);
+    return d->engine.itemCount();
+}
+
+/*!
+    Returns the layout item at \a index, or 0 if there is no layout item at
+    this index.
+*/
+QGraphicsLayoutItem *QGraphicsGridLayout::itemAt(int index) const
+{
+    Q_D(const QGraphicsGridLayout);
+    if (index < 0 || index >= d->engine.itemCount()) {
+        qWarning("QGraphicsGridLayout::itemAt: invalid index %d", index);
+        return 0;
+    }
+    QGraphicsLayoutItem *item = 0;
+    if (QGridLayoutItem *gridItem = d->engine.itemAt(index))
+        item = gridItem->layoutItem();
+    return item;
+}
+
+/*!
+    Removes the layout item at \a index without destroying it. Ownership of
+    the item is transferred to the caller.
+
+    \sa addItem()
+*/
+void QGraphicsGridLayout::removeAt(int index)
+{
+    Q_D(QGraphicsGridLayout);
+    if (index < 0 || index >= d->engine.itemCount()) {
+        qWarning("QGraphicsGridLayout::removeAt: invalid index %d", index);
+        return;
+    }
+    if (QGridLayoutItem *gridItem = d->engine.itemAt(index)) {
+        if (QGraphicsLayoutItem *layoutItem = gridItem->layoutItem())
+            layoutItem->setParentLayoutItem(0);
+        d->engine.removeItem(gridItem);
+        delete gridItem;
+        invalidate();
+    }
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsGridLayout::invalidate()
+{
+    Q_D(QGraphicsGridLayout);
+    d->engine.invalidate();
+    QGraphicsLayout::invalidate();
+}
+
+#ifdef QT_DEBUG
+void QGraphicsGridLayoutPrivate::dump(int indent) const
+{
+    if (qt_graphicsLayoutDebug()) {
+        engine.dump(indent + 1);
+    }
+}
+#endif
+
+/*!
+    Sets the bounding geometry of the grid layout to \a rect.
+*/
+void QGraphicsGridLayout::setGeometry(const QRectF &rect)
+{
+    Q_D(QGraphicsGridLayout);
+    QGraphicsLayout::setGeometry(rect);
+    QRectF effectiveRect = geometry();
+    qreal left, top, right, bottom;
+    getContentsMargins(&left, &top, &right, &bottom);
+    Qt::LayoutDirection visualDir = d->visualDirection();
+    d->engine.setVisualDirection(visualDir);
+    if (visualDir == Qt::RightToLeft)
+        qSwap(left, right);
+    effectiveRect.adjust(+left, +top, -right, -bottom);
+    d->engine.setGeometries(d->styleInfo(), effectiveRect);
+#ifdef QT_DEBUG
+    if (qt_graphicsLayoutDebug()) {
+        static int counter = 0;
+        qDebug("==== BEGIN DUMP OF QGraphicsGridLayout (%d)====", counter++);
+        d->dump(1);
+        qDebug("==== END DUMP OF QGraphicsGridLayout ====");
+    }
+#endif
+}
+
+/*!
+    \reimp
+*/
+QSizeF QGraphicsGridLayout::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
+{
+    Q_D(const QGraphicsGridLayout);
+    qreal left, top, right, bottom;
+    getContentsMargins(&left, &top, &right, &bottom);
+    return d->engine.sizeHint(d->styleInfo(), which , constraint) + QSizeF(left + right, top + bottom);
+}
+
+
+#if 0
+// ### kill? (implement and kill?)
+QRect QGraphicsGridLayout::cellRect(int row, int column, int rowSpan, int columnSpan) const
+{
+    Q_D(const QGraphicsGridLayout);
+    return QRect();
+//    return d->engine.cellRect(parentLayoutable(), contentsGeometry(), row, column, rowSpan, columnSpan);
+}
+
+QSizePolicy::ControlTypes QGraphicsGridLayout::controlTypes(LayoutSide side) const
+{
+    Q_D(const QGraphicsGridLayout);
+    return d->engine.controlTypes(side);
+}
+#endif
+
+QT_END_NAMESPACE
+        
+#endif //QT_NO_GRAPHICSVIEW        
diff --git a/src/gui/graphicsview/qgraphicsgridlayout.h b/src/gui/graphicsview/qgraphicsgridlayout.h
new file mode 100644
index 0000000..5b40d6b
--- /dev/null
+++ b/src/gui/graphicsview/qgraphicsgridlayout.h
@@ -0,0 +1,143 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QGRAPHICSGRIDLAYOUT_H
+#define QGRAPHICSGRIDLAYOUT_H
+
+#include <QtGui/qgraphicsitem.h>
+#include <QtGui/qgraphicslayout.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Gui)
+
+#if !defined(QT_NO_GRAPHICSVIEW) || (QT_EDITION & QT_MODULE_GRAPHICSVIEW) != QT_MODULE_GRAPHICSVIEW
+
+class QGraphicsGridLayoutPrivate;
+
+class Q_GUI_EXPORT QGraphicsGridLayout : public QGraphicsLayout
+{
+public:
+    QGraphicsGridLayout(QGraphicsLayoutItem *parent = 0);
+    virtual ~QGraphicsGridLayout();
+
+    void addItem(QGraphicsLayoutItem *item, int row, int column, int rowSpan, int columnSpan,
+                   Qt::Alignment alignment = 0);
+    inline void addItem(QGraphicsLayoutItem *item, int row, int column, Qt::Alignment alignment = 0);
+
+    void setHorizontalSpacing(qreal spacing);
+    qreal horizontalSpacing() const;
+    void setVerticalSpacing(qreal spacing);
+    qreal verticalSpacing() const;
+    void setSpacing(qreal spacing);
+
+    void setRowSpacing(int row, qreal spacing);
+    qreal rowSpacing(int row) const;
+    void setColumnSpacing(int column, qreal spacing);
+    qreal columnSpacing(int column) const;
+
+    void setRowStretchFactor(int row, int stretch);
+    int rowStretchFactor(int row) const;
+    void setColumnStretchFactor(int column, int stretch);
+    int columnStretchFactor(int column) const;
+
+    void setRowMinimumHeight(int row, qreal height);
+    qreal rowMinimumHeight(int row) const;
+    void setRowPreferredHeight(int row, qreal height);
+    qreal rowPreferredHeight(int row) const;
+    void setRowMaximumHeight(int row, qreal height);
+    qreal rowMaximumHeight(int row) const;
+    void setRowFixedHeight(int row, qreal height);
+
+    void setColumnMinimumWidth(int column, qreal width);
+    qreal columnMinimumWidth(int column) const;
+    void setColumnPreferredWidth(int column, qreal width);
+    qreal columnPreferredWidth(int column) const;
+    void setColumnMaximumWidth(int column, qreal width);
+    qreal columnMaximumWidth(int column) const;
+    void setColumnFixedWidth(int column, qreal width);
+
+    void setRowAlignment(int row, Qt::Alignment alignment);
+    Qt::Alignment rowAlignment(int row) const;
+    void setColumnAlignment(int column, Qt::Alignment alignment);
+    Qt::Alignment columnAlignment(int column) const;
+
+    void setAlignment(QGraphicsLayoutItem *item, Qt::Alignment alignment);
+    Qt::Alignment alignment(QGraphicsLayoutItem *item) const;
+
+    int rowCount() const;
+    int columnCount() const;
+
+    QGraphicsLayoutItem *itemAt(int row, int column) const;
+    
+    // inherited from QGraphicsLayout
+    int count() const;
+    QGraphicsLayoutItem *itemAt(int index) const;
+    void removeAt(int index);
+
+    void invalidate();
+
+    // inherited from QGraphicsLayoutItem
+    void setGeometry(const QRectF &rect);
+    QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint = QSizeF()) const;
+
+    // ####
+    //QRect cellRect(int row, int column, int rowSpan = 1, int columnSpan = 1) const;
+    //QSizePolicy::ControlTypes controlTypes(LayoutSide side) const;
+
+private:
+    Q_DISABLE_COPY(QGraphicsGridLayout)
+    Q_DECLARE_PRIVATE(QGraphicsGridLayout)
+};
+
+inline void QGraphicsGridLayout::addItem(QGraphicsLayoutItem *aitem, int arow, int acolumn, Qt::Alignment aalignment)
+{ addItem(aitem, arow, acolumn, 1, 1, aalignment); }
+
+#endif
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif
+
diff --git a/src/gui/graphicsview/qgraphicsitem.cpp b/src/gui/graphicsview/qgraphicsitem.cpp
new file mode 100644
index 0000000..d95b194
--- /dev/null
+++ b/src/gui/graphicsview/qgraphicsitem.cpp
@@ -0,0 +1,9036 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*!
+    \class QGraphicsItem
+    \brief The QGraphicsItem class is the base class for all graphical
+    items in a QGraphicsScene.
+    \since 4.2
+    \ingroup multimedia
+    \ingroup graphicsview-api
+
+    It provides a light-weight foundation for writing your own custom items.
+    This includes defining the item's geometry, collision detection, its
+    painting implementation and item interaction through its event handlers.
+    QGraphicsItem is part of \l{The Graphics View Framework}
+
+    \img graphicsview-items.png
+
+    For convenience, Qt provides a set of standard graphics items for the most
+    common shapes. These are:
+
+    \list
+    \o QGraphicsEllipseItem provides an ellipse item
+    \o QGraphicsLineItem provides a line item
+    \o QGraphicsPathItem provides an arbitrary path item
+    \o QGraphicsPixmapItem provides a pixmap item
+    \o QGraphicsPolygonItem provides a polygon item
+    \o QGraphicsRectItem provides a rectangular item
+    \o QGraphicsSimpleTextItem provides a simple text label item
+    \o QGraphicsTextItem provides an advanced text browser item
+    \endlist
+
+    All of an item's geometric information is based on its local coordinate
+    system. The item's position, pos(), is the only function that does not
+    operate in local coordinates, as it returns a position in parent
+    coordinates. \l {The Graphics View Coordinate System} describes the coordinate
+    system in detail.
+
+    You can set whether an item should be visible (i.e., drawn, and accepting
+    events), by calling setVisible(). Hiding an item will also hide its
+    children. Similarly, you can enable or disable an item by calling
+    setEnabled(). If you disable an item, all its children will also be
+    disabled. By default, items are both visible and enabled. To toggle
+    whether an item is selected or not, first enable selection by setting
+    the ItemIsSelectable flag, and then call setSelected(). Normally,
+    selection is toggled by the scene, as a result of user interaction.
+
+    To write your own graphics item, you first create a subclass of
+    QGraphicsItem, and then start by implementing its two pure virtual public
+    functions: boundingRect(), which returns an estimate of the area painted
+    by the item, and paint(), which implements the actual painting. For
+    example:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsitem.cpp 0
+
+    The boundingRect() function has many different purposes. QGraphicsScene
+    bases its item index on boundingRect(), and QGraphicsView uses it both for
+    culling invisible items, and for determining the area that needs to be
+    recomposed when drawing overlapping items. In addition, QGraphicsItem's
+    collision detection mechanisms use boundingRect() to provide an efficient
+    cut-off. The fine grained collision algorithm in collidesWithItem() is based
+    on calling shape(), which returns an accurate outline of the item's shape
+    as a QPainterPath.
+
+    QGraphicsScene expects all items boundingRect() and shape() to remain
+    unchanged unless it is notified. If you want to change an item's geometry
+    in any way, you must first call prepareGeometryChange() to allow
+    QGraphicsScene to update its bookkeeping.
+
+    Collision detection can be done in two ways:
+
+    \list 1
+
+    \o Reimplement shape() to return an accurate shape for your item, and rely
+    on the default implementation of collidesWithItem() to do shape-shape
+    intersection. This can be rather expensive if the shapes are complex.
+
+    \o Reimplement collidesWithItem() to provide your own custom item and shape
+    collision algorithm.
+
+    \endlist
+
+    The contains() function can be called to determine whether the item \e
+    contains a point or not. This function can also be reimplemented by the
+    item. The default behavior of contains() is based on calling shape().
+
+    Items can contain other items, and also be contained by other items. All
+    items can have a parent item and a list of children. Unless the item has
+    no parent, its position is in \e parent coordinates (i.e., the parent's
+    local coordinates). Parent items propagate both their position and their
+    transformation to all children.
+
+    \img graphicsview-parentchild.png
+
+    QGraphicsItem supports affine transformations in addition to its base
+    position, pos(). To change the item's transformation, you can either pass
+    a transformation matrix to setTransform(), or call one of the convenience
+    functions rotate(), scale(), translate(), or shear(). Item transformations
+    accumulate from parent to child, so if both a parent and child item are
+    rotated 90 degrees, the child's total transformation will be 180 degrees.
+    Similarly, if the item's parent is scaled to 2x its original size, its
+    children will also be twice as large. An item's transformation does not
+    affect its own local geometry; all geometry functions (e.g., contains(),
+    update(), and all the mapping functions) still operate in local
+    coordinates. For convenience, QGraphicsItem provides the functions
+    sceneTransform(), which returns the item's total transformation matrix
+    (including its position and all parents' positions and transformations),
+    and scenePos(), which returns its position in scene coordinates. To reset
+    an item's matrix, call resetTransform().
+
+    The paint() function is called by QGraphicsView to paint the item's
+    contents. The item has no background or default fill of its own; whatever
+    is behind the item will shine through all areas that are not explicitly
+    painted in this function.  You can call update() to schedule a repaint,
+    optionally passing the rectangle that needs a repaint. Depending on
+    whether or not the item is visible in a view, the item may or may not be
+    repainted; there is no equivalent to QWidget::repaint() in QGraphicsItem.
+
+    Items are painted by the view, starting with the parent items and then
+    drawing children, in ascending stacking order. You can set an item's
+    stacking order by calling setZValue(), and test it by calling
+    zValue(), where items with low z-values are painted before items with
+    high z-values. Stacking order applies to sibling items; parents are always
+    drawn before their children.
+
+    QGraphicsItem receives events from QGraphicsScene through the virtual
+    function sceneEvent(). This function distributes the most common events
+    to a set of convenience event handlers:
+
+    \list
+    \o contextMenuEvent() handles context menu events
+    \o focusInEvent() and focusOutEvent() handle focus in and out events
+    \o hoverEnterEvent(), hoverMoveEvent(), and hoverLeaveEvent() handles
+    hover enter, move and leave events
+    \o inputMethodEvent() handles input events, for accessibility support
+    \o keyPressEvent() and keyReleaseEvent handle key press and release events
+    \o mousePressEvent(), mouseMoveEvent(), mouseReleaseEvent(), and
+    mouseDoubleClickEvent() handles mouse press, move, release, click and
+    doubleclick events
+    \endlist
+
+    You can filter events for any other item by installing event
+    filters. This functionaly is separate from from Qt's regular
+    event filters (see QObject::installEventFilter()), which only
+    work on subclasses of QObject. After installing your item as an
+    event filter for another item by calling
+    installSceneEventFilter(), the filtered events will be received
+    by the virtual function sceneEventFilter(). You can remove item
+    event filters by calling removeSceneEventFilter().
+
+    Sometimes it's useful to register custom data with an item, be it a custom
+    item, or a standard item. You can call setData() on any item to store data
+    in it using a key-value pair (the key being an integer, and the value is a
+    QVariant). To get custom data from an item, call data(). This
+    functionality is completely untouched by Qt itself; it is provided for the
+    user's convenience.
+
+    \sa QGraphicsScene, QGraphicsView, {The Graphics View Framework}
+*/
+
+/*!
+    \variable QGraphicsItem::UserType
+
+    The lowest permitted type value for custom items (subclasses
+    of QGraphicsItem or any of the standard items). This value is
+    used in conjunction with a reimplementation of QGraphicsItem::type()
+    and declaring a Type enum value. Example:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsitem.cpp 1
+*/
+
+/*!
+    \enum QGraphicsItem::GraphicsItemFlag
+
+    This enum describes different flags that you can set on an item to
+    toggle different features in the item's behavior.
+
+    All flags are disabled by default.
+
+    \value ItemIsMovable The item supports interactive movement using
+    the mouse. By clicking on the item and then dragging, the item
+    will move together with the mouse cursor. If the item has
+    children, all children are also moved. If the item is part of a
+    selection, all selected items are also moved. This feature is
+    provided as a convenience through the base implementation of
+    QGraphicsItem's mouse event handlers.
+
+    \value ItemIsSelectable The item supports selection. Enabling this
+    feature will enable setSelected() to toggle selection for the
+    item. It will also let the item be selected automatically as a
+    result of calling QGraphicsScene::setSelectionArea(), by clicking
+    on an item, or by using rubber band selection in QGraphicsView.
+
+    \value ItemIsFocusable The item supports keyboard input focus (i.e., it is
+    an input item). Enabling this flag will allow the item to accept focus,
+    which again allows the delivery of key events to
+    QGraphicsItem::keyPressEvent() and QGraphicsItem::keyReleaseEvent().
+
+    \value ItemClipsToShape The item clips to its own shape. The item cannot
+    draw or receive mouse, tablet, drag and drop or hover events outside ts
+    shape. It is disabled by default. This behavior is enforced by
+    QGraphicsView::drawItems() or QGraphicsScene::drawItems(). This flag was
+    introduced in Qt 4.3.
+
+    \value ItemClipsChildrenToShape The item clips the painting of all its
+    descendants to its own shape. Items that are either direct or indirect
+    children of this item cannot draw outside this item's shape. By default,
+    this flag is disabled; children can draw anywhere. This behavior is
+    enforced by QGraphicsView::drawItems() or
+    QGraphicsScene::drawItems(). This flag was introduced in Qt 4.3.
+
+    \value ItemIgnoresTransformations The item ignores inherited
+    transformations (i.e., its position is still anchored to its parent, but
+    the parent or view rotation, zoom or shear transformations are ignored).
+    This flag is useful for keeping text label items horizontal and unscaled,
+    so they will still be readable if the view is transformed.  When set, the
+    item's view geometry and scene geometry will be maintained separately. You
+    must call deviceTransform() to map coordinates and detect collisions in
+    the view. By default, this flag is disabled. This flag was introduced in
+    Qt 4.3. \note With this flag set you can still scale the item itself, and
+    that scale transformation will influence the item's children.
+
+    \value ItemIgnoresParentOpacity The item ignores its parent's opacity. The
+    item's effective opacity is the same as its own; it does not combine with
+    the parent's opacity. This flags allows your item to keep its absolute
+    opacity even if the parent is semitransparent. This flag was introduced in
+    Qt 4.5.
+
+    \value ItemDoesntPropagateOpacityToChildren The item doesn't propagate its
+    opacity to its children. This flag allows you to create a semitransparent
+    item that does not affect the opacity of its children. This flag was
+    introduced in Qt 4.5.
+
+    \value ItemStacksBehindParent The item is stacked behind its parent. By
+    default, child items are stacked on top of the parent item. But setting
+    this flag, the child will be stacked behind it. This flag is useful for
+    drop shadow effects and for decoration objects that follow the parent
+    item's geometry without drawing on top of it.
+*/
+
+/*!
+    \enum QGraphicsItem::GraphicsItemChange
+
+        ItemVisibleHasChanged,
+        ItemEnabledHasChanged,
+        ItemSelectedHasChanged,
+        ItemParentHasChanged,
+        ItemSceneHasChanged
+
+    This enum describes the state changes that are notified by
+    QGraphicsItem::itemChange(). The notifications are sent as the state
+    changes, and in some cases, adjustments can be made (see the documentation
+    for each change for details).
+
+    Note: Be careful with calling functions on the QGraphicsItem itself inside
+    itemChange(), as certain function calls can lead to unwanted
+    recursion. For example, you cannot call setPos() in itemChange() on an
+    ItemPositionChange notification, as the setPos() function will again call
+    itemChange(ItemPositionChange). Instead, you can return the new, adjusted
+    position from itemChange().
+
+    \value ItemEnabledChange The item's enabled state changes. If the item is
+    presently enabled, it will become disabled, and vice verca. The value
+    argument is the new enabled state (i.e., true or false). Do not call
+    setEnabled() in itemChange() as this notification is delivered. Instead,
+    you can return the new state from itemChange().
+
+    \value ItemEnabledHasChanged The item's enabled state has changed. The
+    value argument is the new enabled state (i.e., true or false). Do not call
+    setEnabled() in itemChange() as this notification is delivered. The return
+    value is ignored.
+
+    \value ItemMatrixChange The item's affine transformation matrix is
+    changing. This value is obsolete; you can use ItemTransformChange instead.
+
+    \value ItemPositionChange The item's position changes. This notification
+    is only sent when the item's local position changes, relative to its
+    parent, has changed (i.e., as a result of calling setPos() or
+    moveBy()). The value argument is the new position (i.e., a QPointF).  You
+    can call pos() to get the original position. Do not call setPos() or
+    moveBy() in itemChange() as this notification is delivered; instead, you
+    can return the new, adjusted position from itemChange(). After this
+    notification, QGraphicsItem immediately sends the ItemPositionHasChanged
+    notification if the position changed.
+
+    \value ItemPositionHasChanged The item's position has changed. This
+    notification is only sent after the item's local position, relative to its
+    parent, has changed. The value argument is the new position (the same as
+    pos()), and QGraphicsItem ignores the return value for this notification
+    (i.e., a read-only notification).
+
+    \value ItemTransformChange The item's transformation matrix changes. This
+    notification is only sent when the item's local transformation matrix
+    changes (i.e., as a result of calling setTransform(), or one of the
+    convenience transformation functions, such as rotate()). The value
+    argument is the new matrix (i.e., a QTransform); to get the old matrix,
+    call transform(). Do not call setTransform() or any of the transformation
+    convenience functions in itemChange() as this notification is delivered;
+    instead, you can return the new matrix from itemChange().
+
+    \value ItemTransformHasChanged The item's transformation matrix has
+    changed.  This notification is only sent after the item's local
+    trasformation matrix has changed. The value argument is the new matrix
+    (same as transform()), and QGraphicsItem ignores the return value for this
+    notification (i.e., a read-only notification).
+
+    \value ItemSelectedChange The item's selected state changes. If the item
+    is presently selected, it will become unselected, and vice verca. The
+    value argument is the new selected state (i.e., true or false). Do not
+    call setSelected() in itemChange() as this notification is delivered();
+    instead, you can return the new selected state from itemChange().
+
+    \value ItemSelectedHasChanged The item's selected state has changed. The
+    value argument is the new selected state (i.e., true or false). Do not
+    call setSelected() in itemChange() as this notification is delivered. The
+    return value is ignored.
+
+    \value ItemVisibleChange The item's visible state changes. If the item is
+    presently visible, it will become invisible, and vice verca. The value
+    argument is the new visible state (i.e., true or false). Do not call
+    setVisible() in itemChange() as this notification is delivered; instead,
+    you can return the new visible state from itemChange().
+
+    \value ItemVisibleHasChanged The item's visible state has changed. The
+    value argument is the new visible state (i.e., true or false). Do not call
+    setVisible() in itemChange() as this notification is delivered. The return
+    value is ignored.
+
+    \value ItemParentChange The item's parent changes. The value argument is
+    the new parent item (i.e., a QGraphicsItem pointer).  Do not call
+    setParentItem() in itemChange() as this notification is delivered;
+    instead, you can return the new parent from itemChange().
+
+    \value ItemParentHasChanged The item's parent has changed. The value
+    argument is the new parent (i.e., a pointer to a QGraphicsItem). Do not
+    call setParentItem() in itemChange() as this notification is
+    delivered. The return value is ignored.
+
+    \value ItemChildAddedChange A child is added to this item. The value
+    argument is the new child item (i.e., a QGraphicsItem pointer). Do not
+    pass this item to any item's setParentItem() function as this notification
+    is delivered. The return value is unused; you cannot adjust anything in
+    this notification. Note that the new child might not be fully constructed
+    when this notification is sent; calling pure virtual functions on
+    the child can lead to a crash.
+
+    \value ItemChildRemovedChange A child is removed from this item. The value
+    argument is the child item that is about to be removed (i.e., a
+    QGraphicsItem pointer). The return value is unused; you cannot adjust
+    anything in this notification.
+
+    \value ItemSceneChange The item is moved to a new scene. This notification
+    is also sent when the item is added to its initial scene, and when it is
+    removed. The value argument is the new scene (i.e., a QGraphicsScene
+    pointer), or a null pointer if the item is removed from a scene. Do not
+    override this change by passing this item to QGraphicsScene::addItem() as
+    this notification is delivered; instead, you can return the new scene from
+    itemChange(). Use this feature with caution; objecting to a scene change can
+    quickly lead to unwanted recursion.
+
+    \value ItemSceneHasChanged The item's scene has changed. The value
+    argument is the new scene (i.e., a pointer to a QGraphicsScene). Do not
+    call setScene() in itemChange() as this notification is delivered. The
+    return value is ignored.
+
+    \value ItemCursorChange The item's cursor changes. The value argument is
+    the new cursor (i.e., a QCursor). Do not call setCursor() in itemChange()
+    as this notification is delivered. Instead, you can return a new cursor
+    from itemChange().
+
+    \value ItemCursorHasChanged The item's cursor has changed. The value
+    argument is the new cursor (i.e., a QCursor). Do not call setCursor() as
+    this notification is delivered. The return value is ignored.
+
+    \value ItemToolTipChange The item's tooltip changes. The value argument is
+    the new tooltip (i.e., a QToolTip). Do not call setToolTip() in
+    itemChange() as this notification is delivered. Instead, you can return a
+    new tooltip from itemChange().
+
+    \value ItemToolTipHasChanged The item's tooltip has changed. The value
+    argument is the new tooltip (i.e., a QToolTip). Do not call setToolTip()
+    as this notification is delivered. The return value is ignored.
+
+    \value ItemFlagsChange The item's flags change. The value argument is the
+    new flags (i.e., a quint32). Do not call setFlags() in itemChange() as
+    this notification is delivered. Instead, you can return the new flags from
+    itemChange().
+
+    \value ItemFlagsHaveChanged The item's flags have changed. The value
+    argument is the new flags (i.e., a quint32). Do not call setFlags() in
+    itemChange() as this notification is delivered. The return value is
+    ignored.
+
+    \value ItemZValueChange The item's Z-value changes. The value argument is
+    the new Z-value (i.e., a double). Do not call setZValue() in itemChange()
+    as this notification is delivered. Instead, you can return a new Z-value
+    from itemChange().
+
+    \value ItemZValueHasChanged The item's Z-value has changed. The value
+    argument is the new Z-value (i.e., a double). Do not call setZValue() as
+    this notification is delivered. The return value is ignored.
+
+    \value ItemOpacityChange The item's opacity changes. The value argument is
+    the new opacity (i.e., a double). Do not call setOpacity() in itemChange()
+    as this notification is delivered. Instead, you can return a new opacity
+    from itemChange().
+
+    \value ItemOpacityHasChanged The item's opacity has changed. The value
+    argument is the new opacity (i.e., a double). Do not call setOpacity() as
+    this notification is delivered. The return value is ignored.
+*/
+
+/*!
+    \enum QGraphicsItem::CacheMode
+    \since 4.4
+
+    This enum describes QGraphicsItem's cache modes. Caching is used to speed
+    up rendering by allocating and rendering to an off-screen pixel buffer,
+    which can be reused when the item requires redrawing. For some paint
+    devices, the cache is stored directly in graphics memory, which makes
+    rendering very quick.
+
+    \value NoCache The default; all item caching is
+    disabled. QGraphicsItem::paint() is called every time the item needs
+    redrawing.
+
+    \value ItemCoordinateCache Caching is enabled for the item's logical
+    (local) coordinate system. QGraphicsItem creates an off-screen pixel
+    buffer with a configurable size / resolution that you can pass to
+    QGraphicsItem::setCacheMode(). Rendering quality will typically degrade,
+    depending on the resolution of the cache and the item transformation.  The
+    first time the item is redrawn, it will render itself into the cache, and
+    the cache is then reused for every subsequent expose. The cache is also
+    reused as the item is transformed. To adjust the resolution of the cache,
+    you can call setCacheMode() again.
+
+    \value DeviceCoordinateCache Caching is enabled at the paint device level,
+    in device coordinates. This mode is for items that can move, but are not
+    rotated, scaled or sheared. If the item is transformed directly or
+    indirectly, the cache will be regenerated automatically. Unlike
+    ItemCoordinateCacheMode, DeviceCoordinateCache always renders at maximum
+    quality.
+
+    \sa QGraphicsItem::setCacheMode()
+*/
+
+/*!
+    \enum QGraphicsItem::Extension
+    \internal
+
+    Note: This is provided as a hook to avoid future problems related
+    to adding virtual functions. See also extension(),
+    supportsExtension() and setExtension().
+*/
+
+#include "qgraphicsitem.h"
+
+#ifndef QT_NO_GRAPHICSVIEW
+
+#include "qgraphicsscene.h"
+#include "qgraphicsscene_p.h"
+#include "qgraphicssceneevent.h"
+#include "qgraphicsview.h"
+#include "qgraphicswidget.h"
+#include "qgraphicsproxywidget.h"
+#include <QtCore/qbitarray.h>
+#include <QtCore/qdebug.h>
+#include <QtCore/qpoint.h>
+#include <QtCore/qstack.h>
+#include <QtCore/qtimer.h>
+#include <QtCore/qvariant.h>
+#include <QtCore/qvarlengtharray.h>
+#include <QtGui/qapplication.h>
+#include <QtGui/qbitmap.h>
+#include <QtGui/qpainter.h>
+#include <QtGui/qpainterpath.h>
+#include <QtGui/qpixmapcache.h>
+#include <QtGui/qstyleoption.h>
+#include <QtGui/qevent.h>
+
+#include <private/qgraphicsitem_p.h>
+#include <private/qgraphicswidget_p.h>
+#include <private/qtextcontrol_p.h>
+#include <private/qtextdocumentlayout_p.h>
+#include <private/qtextengine_p.h>
+
+#include <math.h>
+
+QT_BEGIN_NAMESPACE
+
+// QRectF::intersects() returns false always if either the source or target
+// rectangle's width or height are 0. This works around that problem.
+static QRectF _q_adjustedRect(const QRectF &rect)
+{
+    static const qreal p = (qreal)0.00001;
+    QRectF r = rect;
+    if (!r.width())
+        r.adjust(-p, 0, p, 0);
+    if (!r.height())
+        r.adjust(0, -p, 0, p);
+    return r;
+}
+
+static QRect _q_adjustedRect(const QRect &rect)
+{
+    QRect r = rect;
+    if (!r.width())
+        r.adjust(0, 0, 1, 0);
+    if (!r.height())
+        r.adjust(0, 0, 0, 1);
+    return r;
+}
+
+/*
+    ### Move this into QGraphicsItemPrivate
+ */
+class QGraphicsItemCustomDataStore
+{
+public:
+    QMap<const QGraphicsItem *, QMap<int, QVariant> > data;
+};
+Q_GLOBAL_STATIC(QGraphicsItemCustomDataStore, qt_dataStore)
+
+/*!
+    \internal
+
+    Removes the first instance of \a child from \a children. This is a
+    heuristic approach that assumes that it's common to remove items from the
+    start or end of the list.
+*/
+static void qt_graphicsitem_removeChild(QGraphicsItem *child, QList<QGraphicsItem *> *children)
+{
+    const int n = children->size();
+    for (int i = 0; i < (n + 1) / 2; ++i) {
+        if (children->at(i) == child) {
+            children->removeAt(i);
+            return;
+        }
+        int j = n - i - 1;
+        if (children->at(j) == child) {
+            children->removeAt(j);
+            return;
+        }
+    }
+}
+
+/*!
+    \internal
+
+    Returns a QPainterPath of \a path when stroked with the \a pen.
+    Ignoring dash pattern.
+*/
+static QPainterPath qt_graphicsItem_shapeFromPath(const QPainterPath &path, const QPen &pen)
+{
+    // We unfortunately need this hack as QPainterPathStroker will set a width of 1.0
+    // if we pass a value of 0.0 to QPainterPathStroker::setWidth()
+    const qreal penWidthZero = qreal(0.00000001);
+
+    if (path == QPainterPath())
+        return path;
+    QPainterPathStroker ps;
+    ps.setCapStyle(pen.capStyle());
+    if (pen.widthF() <= 0.0)
+        ps.setWidth(penWidthZero);
+    else
+        ps.setWidth(pen.widthF());
+    ps.setJoinStyle(pen.joinStyle());
+    ps.setMiterLimit(pen.miterLimit());
+    QPainterPath p = ps.createStroke(path);
+    p.addPath(path);
+    return p;
+}
+
+/*!
+    \internal
+
+    Propagates the ancestor flag \a flag with value \a enabled to all this
+    item's children. If \a root is false, the flag is also set on this item
+    (default is true).
+*/
+void QGraphicsItemPrivate::updateAncestorFlag(QGraphicsItem::GraphicsItemFlag childFlag,
+                                           AncestorFlag flag, bool enabled, bool root)
+{
+    Q_Q(QGraphicsItem);
+    if (root) {
+        // For root items only. This is the item that has either enabled or
+        // disabled \a childFlag, or has been reparented.
+        switch (int(childFlag)) {
+        case -1:
+            flag = AncestorHandlesChildEvents;
+            enabled = q->handlesChildEvents();
+            break;
+        case QGraphicsItem::ItemClipsChildrenToShape:
+            flag = AncestorClipsChildren;
+            enabled = flags & QGraphicsItem::ItemClipsChildrenToShape;
+            break;
+        case QGraphicsItem::ItemIgnoresTransformations:
+            flag = AncestorIgnoresTransformations;
+            enabled = flags & QGraphicsItem::ItemIgnoresTransformations;
+            break;
+        default:
+            return;
+        }
+
+        // Inherit the enabled-state from our parents.
+        if ((parent && ((parent->d_ptr->ancestorFlags & flag)
+                        || (int(parent->d_ptr->flags & childFlag) == childFlag)
+                        || (childFlag == -1 && parent->d_ptr->handlesChildEvents)))) {
+            enabled = true;
+            ancestorFlags |= flag;
+        }
+
+        // Top-level root items don't have any ancestors, so there are no
+        // ancestor flags either.
+        if (!parent)
+            ancestorFlags = 0;
+    } else {
+        // Don't set or propagate the ancestor flag if it's already correct.
+        if (((ancestorFlags & flag) && enabled) || (!(ancestorFlags & flag) && !enabled))
+            return;
+
+        // Set the flag.
+        if (enabled)
+            ancestorFlags |= flag;
+        else
+            ancestorFlags &= ~flag;
+
+        // Don't process children if the item has the main flag set on itself.
+        if ((childFlag != -1 &&  int(flags & childFlag) == childFlag) || (int(childFlag) == -1 && handlesChildEvents))
+            return;
+    }
+
+    foreach (QGraphicsItem *child, children)
+        child->d_ptr->updateAncestorFlag(childFlag, flag, enabled, false);
+}
+
+/*!
+    \internal
+
+    Propagates item group membership.
+*/
+void QGraphicsItemPrivate::setIsMemberOfGroup(bool enabled)
+{
+    Q_Q(QGraphicsItem);
+    isMemberOfGroup = enabled;
+    if (!qgraphicsitem_cast<QGraphicsItemGroup *>(q)) {
+        foreach (QGraphicsItem *child, children)
+            child->d_func()->setIsMemberOfGroup(enabled);
+    }
+}
+
+/*!
+    \internal
+
+    Maps any item pos properties of \a event to \a item's coordinate system.
+*/
+void QGraphicsItemPrivate::remapItemPos(QEvent *event, QGraphicsItem *item)
+{
+    Q_Q(QGraphicsItem);
+    switch (event->type()) {
+    case QEvent::GraphicsSceneMouseMove:
+    case QEvent::GraphicsSceneMousePress:
+    case QEvent::GraphicsSceneMouseRelease:
+    case QEvent::GraphicsSceneMouseDoubleClick: {
+        QGraphicsSceneMouseEvent *mouseEvent = static_cast<QGraphicsSceneMouseEvent *>(event);
+        mouseEvent->setPos(item->mapFromItem(q, mouseEvent->pos()));
+        mouseEvent->setLastPos(item->mapFromItem(q, mouseEvent->pos()));
+        for (int i = 0x1; i <= 0x10; i <<= 1) {
+            if (mouseEvent->buttons() & i) {
+                Qt::MouseButton button = Qt::MouseButton(i);
+                mouseEvent->setButtonDownPos(button, item->mapFromItem(q, mouseEvent->buttonDownPos(button)));
+            }
+        }
+        break;
+    }
+    case QEvent::GraphicsSceneWheel: {
+        QGraphicsSceneWheelEvent *wheelEvent = static_cast<QGraphicsSceneWheelEvent *>(event);
+        wheelEvent->setPos(item->mapFromItem(q, wheelEvent->pos()));
+        break;
+    }
+    case QEvent::GraphicsSceneContextMenu: {
+        QGraphicsSceneContextMenuEvent *contextEvent = static_cast<QGraphicsSceneContextMenuEvent *>(event);
+        contextEvent->setPos(item->mapFromItem(q, contextEvent->pos()));
+        break;
+    }
+    case QEvent::GraphicsSceneHoverMove: {
+        QGraphicsSceneHoverEvent *hoverEvent = static_cast<QGraphicsSceneHoverEvent *>(event);
+        hoverEvent->setPos(item->mapFromItem(q, hoverEvent->pos()));
+        break;
+    }
+    default:
+        break;
+    }
+}
+
+/*!
+    \internal
+
+    Maps the point \a pos from scene to item coordinates. If \a view is passed and the item
+    is untransformable, this function will correctly map \a pos from the scene using the
+    view's transformation.
+*/
+QPointF QGraphicsItemPrivate::genericMapFromScene(const QPointF &pos,
+                                                  const QWidget *viewport) const
+{
+    Q_Q(const QGraphicsItem);
+    if (!itemIsUntransformable())
+        return q->mapFromScene(pos);
+    QGraphicsView *view = 0;
+    if (viewport)
+        view = qobject_cast<QGraphicsView *>(viewport->parentWidget());
+    if (!view)
+        return q->mapFromScene(pos);
+    // ### More ping pong than needed.
+    return q->deviceTransform(view->viewportTransform()).inverted().map(view->mapFromScene(pos));
+}
+
+/*!
+    \internal
+
+    Returns true if this item or any of its ancestors are untransformable.
+*/
+bool QGraphicsItemPrivate::itemIsUntransformable() const
+{
+    return (flags & QGraphicsItem::ItemIgnoresTransformations)
+        || (ancestorFlags & AncestorIgnoresTransformations);
+}
+
+/*!
+    \internal
+
+    This helper function helped us add input method query support in
+    Qt 4.4.1 without having to reimplement the inputMethodQuery()
+    function in QGraphicsProxyWidget. ### Qt 5: Remove. We cannot
+    remove it in 4.5+ even if we do reimplement the function properly,
+    because apps compiled with 4.4 will not be able to call the
+    reimplementation.
+*/
+QVariant QGraphicsItemPrivate::inputMethodQueryHelper(Qt::InputMethodQuery query) const
+{
+    Q_UNUSED(query);
+    return QVariant();
+}
+
+/*!
+    \internal
+
+    Empty all cached pixmaps from the pixmap cache.
+*/
+void QGraphicsItemCache::purge()
+{
+    QPixmapCache::remove(key);
+    QMutableMapIterator<QPaintDevice *, DeviceData> it(deviceData);
+    while (it.hasNext()) {
+        DeviceData &data = it.next().value();
+        QPixmapCache::remove(data.key);
+        data.cacheIndent = QPoint();
+    }
+    deviceData.clear();
+    allExposed = true;
+    exposed.clear();
+}
+
+/*!
+    Constructs a QGraphicsItem with the given \a parent.
+
+    If \a parent is 0, you can add the item to a scene by calling
+    QGraphicsScene::addItem(). The item will then become a top-level item.
+
+    \sa QGraphicsScene::addItem(), setParentItem()
+*/
+QGraphicsItem::QGraphicsItem(QGraphicsItem *parent
+#ifndef Q_QDOC
+                             // obsolete argument
+                             , QGraphicsScene *scene
+#endif
+    )
+    : d_ptr(new QGraphicsItemPrivate)
+{
+    d_ptr->q_ptr = this;
+    setParentItem(parent);
+
+    if (scene && parent && parent->scene() != scene) {
+        qWarning("QGraphicsItem::QGraphicsItem: ignoring scene (%p), which is"
+                 " different from parent's scene (%p)",
+                 scene, parent->scene());
+        return;
+    }
+    if (scene && !parent)
+        scene->addItem(this);
+}
+
+/*!
+    \internal
+*/
+QGraphicsItem::QGraphicsItem(QGraphicsItemPrivate &dd, QGraphicsItem *parent,
+                             QGraphicsScene *scene)
+    : d_ptr(&dd)
+{
+    d_ptr->q_ptr = this;
+    setParentItem(parent);
+
+    if (scene && parent && parent->scene() != scene) {
+        qWarning("QGraphicsItem::QGraphicsItem: ignoring scene (%p), which is"
+                 " different from parent's scene (%p)",
+                 scene, parent->scene());
+        return;
+    }
+    if (scene && !parent)
+        scene->addItem(this);
+}
+
+/*!
+    Destroys the QGraphicsItem and all its children. If this item is currently
+    associated with a scene, the item will be removed from the scene before it
+    is deleted.
+*/
+QGraphicsItem::~QGraphicsItem()
+{
+    clearFocus();
+    d_ptr->removeExtraItemCache();
+
+    QVariant variant;
+    foreach (QGraphicsItem *child, d_ptr->children) {
+        if (QGraphicsItem *parent = child->parentItem()) {
+            qVariantSetValue<QGraphicsItem *>(variant, child);
+            parent->itemChange(ItemChildRemovedChange, variant);
+        }
+        delete child;
+    }
+    d_ptr->children.clear();
+
+    if (QGraphicsItem *parent = parentItem()) {
+        qVariantSetValue<QGraphicsItem *>(variant, this);
+        parent->itemChange(ItemChildRemovedChange, variant);
+        qt_graphicsitem_removeChild(this, &parent->d_func()->children);
+    }
+    if (d_ptr->scene)
+        d_ptr->scene->d_func()->_q_removeItemLater(this);
+    
+    if (d_ptr->hasTransform) {
+        delete static_cast<QGraphicsItemPrivate::TransformData *>(
+                            qVariantValue<void *>(d_ptr->extra(QGraphicsItemPrivate::ExtraTransform)));
+    }
+        
+    delete d_ptr;
+
+    qt_dataStore()->data.remove(this);
+}
+
+/*!
+    Returns the current scene for the item, or 0 if the item is not stored in
+    a scene.
+
+    To add or move an item to a scene, call QGraphicsScene::addItem().
+*/
+QGraphicsScene *QGraphicsItem::scene() const
+{
+    return d_ptr->scene;
+}
+
+/*!
+    Returns a pointer to this item's item group, or 0 if this item is not
+    member of a group.
+
+    \sa QGraphicsItemGroup, QGraphicsScene::createItemGroup()
+*/
+QGraphicsItemGroup *QGraphicsItem::group() const
+{
+    if (!d_ptr->isMemberOfGroup)
+        return 0;
+    QGraphicsItem *parent = const_cast<QGraphicsItem *>(this);
+    while ((parent = parent->d_ptr->parent)) {
+        if (QGraphicsItemGroup *group = qgraphicsitem_cast<QGraphicsItemGroup *>(parent))
+            return group;
+    }
+    // Unreachable; if d_ptr->isMemberOfGroup is != 0, then one parent of this
+    // item is a group item.
+    return 0;
+}
+
+/*!
+    Adds this item to the item group \a group. If \a group is 0, this item is
+    removed from any current group and added as a child of the previous
+    group's parent.
+
+    \sa group(), QGraphicsScene::createItemGroup()
+*/
+void QGraphicsItem::setGroup(QGraphicsItemGroup *group)
+{
+    if (!group) {
+        if (QGraphicsItemGroup *group = this->group())
+            group->removeFromGroup(this);
+    } else {
+        group->addToGroup(this);
+    }
+}
+
+/*!
+    Returns a pointer to this item's parent item. If this item does not have a
+    parent, 0 is returned.
+
+    \sa setParentItem(), children()
+*/
+QGraphicsItem *QGraphicsItem::parentItem() const
+{
+    return d_ptr->parent;
+}
+
+/*!
+    Returns this item's top-level item. The top-level item is the item's
+    topmost ancestor item whose parent is 0. If an item has no parent, its own
+    pointer is returned (i.e., a top-level item is its own top-level item).
+
+    \sa parentItem()
+*/
+QGraphicsItem *QGraphicsItem::topLevelItem() const
+{
+    QGraphicsItem *parent = const_cast<QGraphicsItem *>(this);
+    while (QGraphicsItem *grandPa = parent->parentItem())
+        parent = grandPa;
+    return parent;
+}
+
+/*!
+    \since 4.4
+
+    Returns a pointer to the item's parent widget. The item's parent widget is
+    the closest parent item that is a widget.
+
+    \sa parentItem(), childItems()
+*/
+QGraphicsWidget *QGraphicsItem::parentWidget() const
+{
+    QGraphicsItem *p = parentItem();
+    while (p && !p->isWidget())
+        p = p->parentItem();
+    return (p && p->isWidget()) ? static_cast<QGraphicsWidget *>(p) : 0;
+}
+
+/*!
+    \since 4.4
+
+    Returns a pointer to the item's top level widget (i.e., the item's
+    ancestor whose parent is 0, or whose parent is not a widget), or 0 if this
+    item does not have a top level widget. If the item is its own top level
+    widget, this function returns a pointer to the item itself.
+*/
+QGraphicsWidget *QGraphicsItem::topLevelWidget() const
+{
+    if (const QGraphicsWidget *p = parentWidget())
+        return p->topLevelWidget();
+    return isWidget() ? static_cast<QGraphicsWidget *>(const_cast<QGraphicsItem *>(this)) : 0;
+}
+
+/*!
+    \since 4.4
+
+    Returns the item's window, or 0 if this item does not have a window. If
+    the item is a window, it will return itself.  Otherwise it will return the
+    closest ancestor that is a window.
+
+    \sa QGraphicsWidget::isWindow()
+*/
+QGraphicsWidget *QGraphicsItem::window() const
+{
+    if (isWidget() && static_cast<const QGraphicsWidget *>(this)->isWindow())
+        return static_cast<QGraphicsWidget *>(const_cast<QGraphicsItem *>(this));
+    if (QGraphicsWidget *parent = parentWidget())
+        return parent->window();
+    return 0;
+}
+
+/*!
+    Sets this item's parent item to \a parent. If this item already has a
+    parent, it is first removed from the previous parent. If \a parent is 0,
+    this item will become a top-level item.
+
+    Note that this implicitly adds this graphics item to the scene of
+    the parent. You should not \l{QGraphicsScene::addItem()}{add} the
+    item to the scene yourself.
+
+    \sa parentItem(), children()
+*/
+void QGraphicsItem::setParentItem(QGraphicsItem *parent)
+{
+    if (parent == this) {
+        qWarning("QGraphicsItem::setParentItem: cannot assign %p as a parent of itself", this);
+        return;
+    }
+    if (parent == d_ptr->parent)
+        return;
+    QVariant variant;
+    qVariantSetValue<QGraphicsItem *>(variant, parent);
+    parent = qVariantValue<QGraphicsItem *>(itemChange(ItemParentChange, variant));
+    if (parent == d_ptr->parent)
+        return;
+
+    if (QGraphicsWidget *w = d_ptr->isWidget ? static_cast<QGraphicsWidget *>(this) : parentWidget()) {
+        // Update the child focus chain; when reparenting a widget that has a
+        // focus child, ensure that that focus child clears its focus child
+        // chain from our parents before it's reparented.
+        if (QGraphicsWidget *focusChild = w->focusWidget())
+            focusChild->clearFocus();
+    }
+
+    // We anticipate geometry changes
+    prepareGeometryChange();
+
+    if (d_ptr->parent) {
+        // Remove from current parent
+        qt_graphicsitem_removeChild(this, &d_ptr->parent->d_func()->children);
+        qVariantSetValue<QGraphicsItem *>(variant, this);
+        d_ptr->parent->itemChange(ItemChildRemovedChange, variant);
+    }
+
+    if ((d_ptr->parent = parent)) {
+        bool implicitUpdate = false;
+        if (parent->d_func()->scene && parent->d_func()->scene != d_ptr->scene) {
+            // Move this item to its new parent's scene
+            parent->d_func()->scene->addItem(this);
+            implicitUpdate = true;
+        } else if (!parent->d_func()->scene && d_ptr->scene) {
+            // Remove this item from its former scene
+            d_ptr->scene->removeItem(this);
+        }
+
+        d_ptr->parent->d_func()->children << this;
+        qVariantSetValue<QGraphicsItem *>(variant, this);
+        d_ptr->parent->itemChange(ItemChildAddedChange, variant);
+        if (!implicitUpdate)
+            d_ptr->updateHelper();
+
+        // Inherit ancestor flags from the new parent.
+        d_ptr->updateAncestorFlag(QGraphicsItem::GraphicsItemFlag(-1));
+        d_ptr->updateAncestorFlag(ItemClipsChildrenToShape);
+        d_ptr->updateAncestorFlag(ItemIgnoresTransformations);
+
+        // Update item visible / enabled.
+        if (d_ptr->parent->isVisible() != d_ptr->visible) {
+            if (!d_ptr->parent->isVisible() || !d_ptr->explicitlyHidden)
+                d_ptr->setVisibleHelper(d_ptr->parent->isVisible(), /* explicit = */ false, /* update = */ !implicitUpdate);
+        }
+        if (d_ptr->parent->isEnabled() != d_ptr->enabled) {
+            if (!d_ptr->parent->isEnabled() || !d_ptr->explicitlyDisabled)
+                d_ptr->setEnabledHelper(d_ptr->parent->isEnabled(), /* explicit = */ false, /* update = */ !implicitUpdate);
+        }
+
+    } else {
+        // Inherit ancestor flags from the new parent.
+        d_ptr->updateAncestorFlag(QGraphicsItem::GraphicsItemFlag(-1));
+        d_ptr->updateAncestorFlag(ItemClipsChildrenToShape);
+        d_ptr->updateAncestorFlag(ItemIgnoresTransformations);
+
+        // Update item visible / enabled.
+        if (!d_ptr->visible && !d_ptr->explicitlyHidden)
+            d_ptr->setVisibleHelper(true, /* explicit = */ false);
+        if (!d_ptr->enabled && !d_ptr->explicitlyDisabled)
+            d_ptr->setEnabledHelper(true, /* explicit = */ false);
+
+        d_ptr->updateHelper();
+    }
+
+    if (d_ptr->scene) {
+        // Invalidate any sort caching; arrival of a new item means we need to
+        // resort.
+        d_ptr->scene->d_func()->invalidateSortCache();
+    }
+
+    // Resolve opacity.
+    if (QGraphicsItem *p = d_ptr->parent)
+        d_ptr->resolveEffectiveOpacity(p->effectiveOpacity());
+    else
+        d_ptr->resolveEffectiveOpacity(1.0);
+
+    // Resolve depth.
+    d_ptr->resolveDepth(parent ? parent->d_ptr->depth : -1);
+
+    // Invalidate transform cache.
+    d_ptr->invalidateSceneTransformCache();
+
+    // Deliver post-change notification
+    itemChange(QGraphicsItem::ItemParentHasChanged, qVariantFromValue<QGraphicsItem *>(parent));
+}
+
+/*!
+    \obsolete
+
+    Use childItems() instead.
+
+    \sa setParentItem()
+*/
+QList<QGraphicsItem *> QGraphicsItem::children() const
+{
+    return childItems();
+}
+
+/*!
+    \since 4.4
+
+    Returns a list of this item's children. The items are returned in no
+    particular order.
+
+    \sa setParentItem()
+*/
+QList<QGraphicsItem *> QGraphicsItem::childItems() const
+{
+    return d_ptr->children;
+}
+
+/*!
+    \since 4.4
+    Returns true if this item is a widget (i.e., QGraphicsWidget); otherwise,
+    returns false.
+*/
+bool QGraphicsItem::isWidget() const
+{
+    return d_ptr->isWidget;
+}
+
+/*!
+    \since 4.4
+    Returns true if the item is a QGraphicsWidget window, otherwise returns
+    false.
+
+    \sa QGraphicsWidget::windowFlags()
+*/
+bool QGraphicsItem::isWindow() const
+{
+    return isWidget() && (static_cast<const QGraphicsWidget *>(this)->windowType() & Qt::Window);
+}
+
+/*!
+    Returns this item's flags. The flags describe what configurable features
+    of the item are enabled and not. For example, if the flags include
+    ItemIsFocusable, the item can accept input focus.
+
+    By default, no flags are enabled.
+
+    \sa setFlags(), setFlag()
+*/
+QGraphicsItem::GraphicsItemFlags QGraphicsItem::flags() const
+{
+    return GraphicsItemFlags(d_ptr->flags);
+}
+
+/*!
+    If \a enabled is true, the item flag \a flag is enabled; otherwise, it is
+    disabled.
+
+    \sa flags(), setFlags()
+*/
+void QGraphicsItem::setFlag(GraphicsItemFlag flag, bool enabled)
+{
+    if (enabled)
+        setFlags(flags() | flag);
+    else
+        setFlags(flags() & ~flag);
+}
+
+/*!
+    \internal
+
+    Sets the flag \a flag on \a item and all its children, to \a enabled.
+*/
+static void _q_qgraphicsItemSetFlag(QGraphicsItem *item, QGraphicsItem::GraphicsItemFlag flag,
+                                    bool enabled)
+{
+    if (item->flags() & flag) {
+        // If this item already has the correct flag set, we don't have to
+        // propagate it.
+        return;
+    }
+    item->setFlag(flag, enabled);
+    foreach (QGraphicsItem *child, item->children())
+        _q_qgraphicsItemSetFlag(child, flag, enabled);
+}
+
+/*!
+    Sets the item flags to \a flags. All flags in \a flags are enabled; all
+    flags not in \a flags are disabled.
+
+    If the item had focus and \a flags does not enable ItemIsFocusable, the
+    item loses focus as a result of calling this function. Similarly, if the
+    item was selected, and \a flags does not enabled ItemIsSelectable, the
+    item is automatically unselected.
+
+    By default, no flags are enabled.
+
+    \sa flags(), setFlag()
+*/
+void QGraphicsItem::setFlags(GraphicsItemFlags flags)
+{
+    // Notify change and check for adjustment.
+    if (quint32(d_ptr->flags) == quint32(flags))
+        return;
+    flags = GraphicsItemFlags(itemChange(ItemFlagsChange, quint32(flags)).toUInt());
+    if (quint32(d_ptr->flags) == quint32(flags))
+        return;
+
+    // Flags that alter the geometry of the item (or its children).
+    int geomChangeFlagsMask = (ItemClipsChildrenToShape | ItemClipsToShape | ItemIgnoresTransformations);
+    bool fullUpdate = (flags & geomChangeFlagsMask) != (d_ptr->flags & geomChangeFlagsMask);
+    if (fullUpdate)
+        d_ptr->fullUpdateHelper();
+
+    // Keep the old flags to compare the diff.
+    GraphicsItemFlags oldFlags = this->flags();
+
+    // Update flags.
+    d_ptr->flags = flags;
+
+    // Reresolve effective opacity if the opacity flags change.
+    static const quint32 opacityFlagsMask = ItemIgnoresParentOpacity | ItemDoesntPropagateOpacityToChildren;
+    if ((flags & opacityFlagsMask) != (oldFlags & opacityFlagsMask)) {
+        if (QGraphicsItem *p = d_ptr->parent)
+            d_ptr->resolveEffectiveOpacity(p->effectiveOpacity());
+        else
+            d_ptr->resolveEffectiveOpacity(1.0);
+    }
+
+    if (!(d_ptr->flags & ItemIsFocusable) && hasFocus()) {
+        // Clear focus on the item if it has focus when the focusable flag
+        // is unset.
+        clearFocus();
+    }
+
+    if (!(d_ptr->flags & ItemIsSelectable) && isSelected()) {
+        // Unselect the item if it is selected when the selectable flag is
+        // unset.
+        setSelected(false);
+    }
+
+    if ((flags & ItemClipsChildrenToShape) != (oldFlags & ItemClipsChildrenToShape)) {
+        // Item children clipping changes. Propagate the ancestor flag to
+        // all children.
+        d_ptr->updateAncestorFlag(ItemClipsChildrenToShape);
+    }
+
+    if ((flags & ItemIgnoresTransformations) != (oldFlags & ItemIgnoresTransformations)) {
+        // Item children clipping changes. Propagate the ancestor flag to
+        // all children.
+        d_ptr->updateAncestorFlag(ItemIgnoresTransformations);
+    }
+
+    // ### Why updateHelper?
+    d_ptr->updateHelper();
+
+    // Notify change.
+    itemChange(ItemFlagsHaveChanged, quint32(flags));
+}
+
+/*!
+    \since 4.4
+    Returns the cache mode for this item. The default mode is NoCache (i.e.,
+    cache is disabled and all painting is immediate).
+
+    \sa setCacheMode()
+*/
+QGraphicsItem::CacheMode QGraphicsItem::cacheMode() const
+{
+    return QGraphicsItem::CacheMode(d_ptr->cacheMode);
+}
+
+/*!
+    \since 4.4
+    Sets the item's cache mode to \a mode.
+
+    The optional \a logicalCacheSize argument is used only by
+    ItemCoordinateCache mode, and describes the resolution of the cache
+    buffer; if \a logicalCacheSize is (100, 100), QGraphicsItem will fit the
+    item into 100x100 pixels in graphics memory, regardless of the logical
+    size of the item itself. By default QGraphicsItem uses the size of
+    boundingRect(). For all other cache modes than ItemCoordinateCache, \a
+    logicalCacheSize is ignored.
+
+    Caching can speed up rendering if your item spends a significant time
+    redrawing itself. In some cases the cache can also slow down rendering, in
+    particular when the item spends less time redrawing than QGraphicsItem
+    spends redrawing from the cache. When enabled, the item's paint() function
+    will be called only once for each call to update(); for any subsequent
+    repaint requests, the Graphics View framework will redraw from the
+    cache. This approach works particularly well with QGLWidget, which stores
+    all the cache as OpenGL textures.
+
+    Be aware that QPixmapCache's cache limit may need to be changed to obtain
+    optimal performance.
+
+    You can read more about the different cache modes in the CacheMode
+    documentation.
+
+    \sa CacheMode, QPixmapCache::setCacheLimit()
+*/
+void QGraphicsItem::setCacheMode(CacheMode mode, const QSize &logicalCacheSize)
+{
+    CacheMode lastMode = CacheMode(d_ptr->cacheMode);
+    d_ptr->cacheMode = mode;
+    bool noVisualChange = (mode == NoCache && lastMode == NoCache)
+                          || (mode == NoCache && lastMode == DeviceCoordinateCache)
+                          || (mode == DeviceCoordinateCache && lastMode == NoCache);
+    if (mode == NoCache) {
+        d_ptr->removeExtraItemCache();
+    } else {
+        QGraphicsItemCache *cache = d_ptr->extraItemCache();
+
+        // Reset old cache
+        cache->purge();
+
+        if (mode == ItemCoordinateCache) {
+            if (cache->key.isEmpty()) {
+                // Generate new simple pixmap cache key.
+                QString tmp;
+                tmp.sprintf("qgv-%p", this);
+                cache->key = tmp;
+            }
+            if (lastMode == mode && cache->fixedSize == logicalCacheSize)
+                noVisualChange = true;
+            cache->fixedSize = logicalCacheSize;
+        }
+    }
+    if (!noVisualChange)
+        update();
+}
+
+#ifndef QT_NO_TOOLTIP
+/*!
+    Returns the item's tool tip, or an empty QString if no tool tip has been
+    set.
+
+    \sa setToolTip(), QToolTip
+*/
+QString QGraphicsItem::toolTip() const
+{
+    return d_ptr->extra(QGraphicsItemPrivate::ExtraToolTip).toString();
+}
+
+/*!
+    Sets the item's tool tip to \a toolTip. If \a toolTip is empty, the item's
+    tool tip is cleared.
+
+    \sa toolTip(), QToolTip
+*/
+void QGraphicsItem::setToolTip(const QString &toolTip)
+{
+    QString newCursor = itemChange(ItemToolTipChange, toolTip).toString();
+    d_ptr->setExtra(QGraphicsItemPrivate::ExtraToolTip, toolTip);
+    itemChange(ItemToolTipHasChanged, toolTip);
+}
+#endif // QT_NO_TOOLTIP
+
+#ifndef QT_NO_CURSOR
+/*!
+    Returns the current cursor shape for the item. The mouse cursor
+    will assume this shape when it's over this item. See the \link
+    Qt::CursorShape list of predefined cursor objects\endlink for a
+    range of useful shapes.
+
+    An editor item might want to use an I-beam cursor:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsitem.cpp 2
+
+    If no cursor has been set, the parent's cursor is used.
+
+    \sa setCursor(), hasCursor(), unsetCursor(), QWidget::cursor,
+    QApplication::overrideCursor()
+*/
+QCursor QGraphicsItem::cursor() const
+{
+    return qVariantValue<QCursor>(d_ptr->extra(QGraphicsItemPrivate::ExtraCursor));
+}
+
+/*!
+    Sets the current cursor shape for the item to \a cursor. The mouse cursor
+    will assume this shape when it's over this item. See the \link
+    Qt::CursorShape list of predefined cursor objects\endlink for a range of
+    useful shapes.
+
+    An editor item might want to use an I-beam cursor:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsitem.cpp 3
+
+    If no cursor has been set, the cursor of the item beneath is used.
+
+    \sa cursor(), hasCursor(), unsetCursor(), QWidget::cursor,
+    QApplication::overrideCursor()
+*/
+void QGraphicsItem::setCursor(const QCursor &cursor)
+{
+    QCursor newCursor = qVariantValue<QCursor>(itemChange(ItemCursorChange,
+                                                          qVariantFromValue<QCursor>(cursor)));
+    d_ptr->setExtra(QGraphicsItemPrivate::ExtraCursor, newCursor);
+    d_ptr->hasCursor = 1;
+    if (d_ptr->scene) {
+        foreach (QGraphicsView *view, d_ptr->scene->views()) {
+            // Note: Some of this logic is duplicated in QGraphicsView's mouse events.
+            if (view->underMouse()) {
+                foreach (QGraphicsItem *itemUnderCursor, view->items(view->mapFromGlobal(QCursor::pos()))) {
+                    if (itemUnderCursor->hasCursor()) {
+                        QMetaObject::invokeMethod(view, "_q_setViewportCursor",
+                                                  Q_ARG(QCursor, itemUnderCursor->cursor()));
+                        break;
+                    }
+                }
+                break;
+            }
+        }
+    }
+    itemChange(ItemCursorHasChanged, qVariantFromValue<QCursor>(newCursor));
+}
+
+/*!
+    Returns true if this item has a cursor set; otherwise, false is returned.
+
+    By default, items don't have any cursor set. cursor() will return a
+    standard pointing arrow cursor.
+
+    \sa unsetCursor()
+*/
+bool QGraphicsItem::hasCursor() const
+{
+    return d_ptr->hasCursor;
+}
+
+/*!
+    Clears the cursor from this item.
+
+    \sa hasCursor(), setCursor()
+*/
+void QGraphicsItem::unsetCursor()
+{
+    d_ptr->unsetExtra(QGraphicsItemPrivate::ExtraCursor);
+    d_ptr->hasCursor = 0;
+    if (d_ptr->scene) {
+        foreach (QGraphicsView *view, d_ptr->scene->views()) {
+            if (view->underMouse() && view->itemAt(view->mapFromGlobal(QCursor::pos())) == this) {
+                QMetaObject::invokeMethod(view, "_q_unsetViewportCursor");
+                break;
+            }
+        }
+    }
+}
+
+#endif // QT_NO_CURSOR
+
+/*!
+   Returns true if the item is visible; otherwise, false is returned.
+
+   Note that the item's general visibility is unrelated to whether or not it
+   is actually being visualized by a QGraphicsView.
+
+   \sa setVisible()
+*/
+bool QGraphicsItem::isVisible() const
+{
+    return d_ptr->visible;
+}
+
+/*!
+    \since 4.4
+    Returns true if the item is visible to \a parent; otherwise, false is
+    returned. \a parent can be 0, in which case this function will return
+    whether the item is visible to the scene or not.
+
+    An item may not be visible to its ancestors even if isVisible() is true. If
+    any ancestor is hidden, the item itself will be implicitly hidden, in which
+    case this function will return false.
+
+    \sa isVisible(), setVisible()
+*/
+bool QGraphicsItem::isVisibleTo(const QGraphicsItem *parent) const
+{
+    if (!d_ptr->visible)
+        return false;
+    if (parent == this)
+        return true;
+    if (parentItem() && parentItem()->isVisibleTo(parent))
+        return true;
+    if (!parent && !parentItem())
+        return true;
+    return false;
+}
+
+/*!
+    \internal
+
+    Sets this item's visibility to \a newVisible. If \a explicitly is true,
+    this item will be "explicitly" \a newVisible; otherwise, it.. will not be.
+*/
+void QGraphicsItemPrivate::setVisibleHelper(bool newVisible, bool explicitly, bool update)
+{
+    Q_Q(QGraphicsItem);
+
+    // Update explicit bit.
+    if (explicitly)
+        explicitlyHidden = newVisible ? 0 : 1;
+
+    // Check if there's nothing to do.
+    if (visible == quint32(newVisible))
+        return;
+
+    // Modify the property.
+    newVisible = q_ptr->itemChange(QGraphicsItem::ItemVisibleChange, quint32(newVisible)).toBool();
+    if (visible == quint32(newVisible))
+        return;
+    visible = newVisible;
+
+    // Schedule redrawing
+    if (update)
+        updateHelper(QRectF(), /* force = */ true);
+
+    // Certain properties are dropped as an item becomes invisible.
+    if (!newVisible) {
+        if (scene) {
+            if (scene->d_func()->mouseGrabberItems.contains(q))
+                q->ungrabMouse();
+            if (scene->d_func()->keyboardGrabberItems.contains(q))
+                q->ungrabKeyboard();
+        }
+        if (q_ptr->hasFocus() && scene) {
+            // Hiding the closest non-window ancestor of the focus item
+            QGraphicsItem *focusItem = scene->focusItem();
+            bool clear = true;
+            if (isWidget && !focusItem->isWindow()) {
+                do {
+                    if (focusItem == q_ptr) {
+                        clear = !static_cast<QGraphicsWidget *>(q_ptr)->focusNextPrevChild(true);
+                        break;
+                    }
+                } while ((focusItem = focusItem->parentWidget()) && !focusItem->isWindow());
+            }
+            if (clear)
+                q_ptr->clearFocus();
+        }
+        if (q_ptr->isSelected())
+            q_ptr->setSelected(false);
+    } else {
+        if (isWidget && scene) {
+            QGraphicsWidget *widget = static_cast<QGraphicsWidget *>(q_ptr);
+            if (widget->windowType() == Qt::Popup)
+                scene->d_func()->addPopup(widget);
+        }
+    }
+
+    // Update children with explicitly = false.
+    foreach (QGraphicsItem *child, children) {
+        if (!newVisible || !child->d_ptr->explicitlyHidden)
+            child->d_ptr->setVisibleHelper(newVisible, false);
+    }
+
+    // Enable subfocus
+    if (newVisible && isWidget) {
+        QGraphicsWidget *widget = static_cast<QGraphicsWidget *>(q_ptr);
+        QGraphicsWidget *fw = widget->focusWidget();
+        if (fw && fw != scene->focusItem())
+            scene->setFocusItem(fw);
+    }
+
+    // Deliver post-change notification.
+    q_ptr->itemChange(QGraphicsItem::ItemVisibleHasChanged, quint32(visible));
+}
+
+/*!
+    If \a visible is true, the item is made visible. Otherwise, the item is
+    made invisible. Invisible items are not painted, nor do they receive any
+    events. In particular, mouse events pass right through invisible items,
+    and are delivered to any item that may be behind. Invisible items are also
+    unselectable, they cannot take input focus, and are not detected by
+    QGraphicsScene's item location functions.
+
+    If an item becomes invisible while grabbing the mouse, (i.e., while it is
+    receiving mouse events,) it will automatically lose the mouse grab, and
+    the grab is not regained by making the item visible again; it must receive
+    a new mouse press to regain the mouse grab.
+
+    Similarly, an invisible item cannot have focus, so if the item has focus
+    when it becomes invisible, it will lose focus, and the focus is not
+    regained by simply making the item visible again.
+
+    If you hide a parent item, all its children will also be hidden. If you
+    show a parent item, all children will be shown, unless they have been
+    explicitly hidden (i.e., if you call setVisible(false) on a child, it will
+    not be reshown even if its parent is hidden, and then shown again).
+
+    Items are visible by default; it is unnecessary to call
+    setVisible() on a new item.
+
+    \sa isVisible(), show(), hide()
+*/
+void QGraphicsItem::setVisible(bool visible)
+{
+    d_ptr->setVisibleHelper(visible, /* explicit = */ true);
+}
+
+/*!
+    \fn void QGraphicsItem::hide()
+
+    Hides the item. (Items are visible by default.)
+
+    This convenience function is equivalent to calling \c setVisible(false).
+
+    \sa show(), setVisible()
+*/
+
+/*!
+    \fn void QGraphicsItem::show()
+
+    Shows the item. (Items are visible by default.)
+
+    This convenience function is equivalent to calling \c setVisible(true).
+
+    \sa hide(), setVisible()
+*/
+
+/*!
+    Returns true if the item is enabled; otherwise, false is returned.
+
+    \sa setEnabled()
+*/
+bool QGraphicsItem::isEnabled() const
+{
+    return d_ptr->enabled;
+}
+
+/*!
+    \internal
+
+    Sets this item's visibility to \a newEnabled. If \a explicitly is true,
+    this item will be "explicitly" \a newEnabled; otherwise, it.. will not be.
+*/
+void QGraphicsItemPrivate::setEnabledHelper(bool newEnabled, bool explicitly, bool update)
+{
+    // Update explicit bit.
+    if (explicitly)
+        explicitlyDisabled = newEnabled ? 0 : 1;
+
+    // Check if there's nothing to do.
+    if (enabled == quint32(newEnabled))
+        return;
+
+    // Certain properties are dropped when an item is disabled.
+    if (!newEnabled) {
+        if (scene && scene->mouseGrabberItem() == q_ptr)
+            q_ptr->ungrabMouse();
+        if (q_ptr->hasFocus()) {
+            // Disabling the closest non-window ancestor of the focus item
+            // causes focus to pop to the next item, otherwise it's cleared.
+            QGraphicsItem *focusItem = scene->focusItem();
+            bool clear = true;
+            if (isWidget && !focusItem->isWindow() && q_ptr->isAncestorOf(focusItem)) {
+                do {
+                    if (focusItem == q_ptr) {
+                        clear = !static_cast<QGraphicsWidget *>(q_ptr)->focusNextPrevChild(true);
+                        break;
+                    }
+                } while ((focusItem = focusItem->parentWidget()) && !focusItem->isWindow());
+            }
+            if (clear)
+                q_ptr->clearFocus();
+        }
+        if (q_ptr->isSelected())
+            q_ptr->setSelected(false);
+    }
+
+    // Modify the property.
+    enabled = q_ptr->itemChange(QGraphicsItem::ItemEnabledChange, quint32(newEnabled)).toBool();
+
+    // Schedule redraw.
+    if (update)
+        updateHelper();
+
+    foreach (QGraphicsItem *child, children) {
+        if (!newEnabled || !child->d_ptr->explicitlyDisabled)
+            child->d_ptr->setEnabledHelper(newEnabled, /* explicitly = */ false);
+    }
+
+    // Deliver post-change notification.
+    q_ptr->itemChange(QGraphicsItem::ItemEnabledHasChanged, quint32(enabled));
+}
+
+/*!
+    If \a enabled is true, the item is enabled; otherwise, it is disabled.
+
+    Disabled items are visible, but they do not receive any events, and cannot
+    take focus nor be selected. Mouse events are discarded; they are not
+    propagated unless the item is also invisible, or if it does not accept
+    mouse events (see acceptedMouseButtons()). A disabled item cannot become the
+    mouse grabber, and as a result of this, an item loses the grab if it
+    becomes disabled when grabbing the mouse, just like it loses focus if it
+    had focus when it was disabled.
+
+    Disabled items are traditionally drawn using grayed-out colors (see \l
+    QPalette::Disabled).
+
+    If you disable a parent item, all its children will also be disabled. If
+    you enable a parent item, all children will be enabled, unless they have
+    been explicitly disabled (i.e., if you call setEnabled(false) on a child,
+    it will not be reenabled if its parent is disabled, and then enabled
+    again).
+
+    Items are enabled by default.
+
+    \note If you install an event filter, you can still intercept events
+    before they are delivered to items; this mechanism disregards the item's
+    enabled state.
+
+    \sa isEnabled()
+*/
+void QGraphicsItem::setEnabled(bool enabled)
+{
+    d_ptr->setEnabledHelper(enabled, /* explicitly = */ true);
+}
+
+/*!
+    Returns true if this item is selected; otherwise, false is returned.
+
+    Items that are in a group inherit the group's selected state.
+
+    Items are not selected by default.
+
+    \sa setSelected(), QGraphicsScene::setSelectionArea()
+*/
+bool QGraphicsItem::isSelected() const
+{
+    if (QGraphicsItemGroup *group = this->group())
+        return group->isSelected();
+    return d_ptr->selected;
+}
+
+/*!
+    If \a selected is true and this item is selectable, this item is selected;
+    otherwise, it is unselected.
+
+    If the item is in a group, the whole group's selected state is toggled by
+    this function. If the group is selected, all items in the group are also
+    selected, and if the group is not selected, no item in the group is
+    selected.
+
+    Only visible, enabled, selectable items can be selected.  If \a selected
+    is true and this item is either invisible or disabled or unselectable,
+    this function does nothing.
+
+    By default, items cannot be selected. To enable selection, set the
+    ItemIsSelectable flag.
+
+    This function is provided for convenience, allowing individual toggling of
+    the selected state of an item. However, a more common way of selecting
+    items is to call QGraphicsScene::setSelectionArea(), which will call this
+    function for all visible, enabled, and selectable items within a specified
+    area on the scene.
+
+    \sa isSelected(), QGraphicsScene::selectedItems()
+*/
+void QGraphicsItem::setSelected(bool selected)
+{
+    if (QGraphicsItemGroup *group = this->group()) {
+        group->setSelected(selected);
+        return;
+    }
+
+    if (!(d_ptr->flags & ItemIsSelectable) || !d_ptr->enabled || !d_ptr->visible)
+        selected = false;
+    if (d_ptr->selected == selected)
+        return;
+    bool newSelected = itemChange(ItemSelectedChange, quint32(selected)).toBool();
+    if (d_ptr->selected == newSelected)
+        return;
+    d_ptr->selected = newSelected;
+
+    d_ptr->updateHelper();
+
+    if (d_ptr->scene) {
+        QGraphicsScenePrivate *sceneD = d_ptr->scene->d_func();
+        if (selected) {
+            sceneD->selectedItems << this;
+        } else {
+            // QGraphicsScene::selectedItems() lazily pulls out all items that are
+            // no longer selected.
+        }
+        if (!sceneD->selectionChanging)
+            emit d_ptr->scene->selectionChanged();
+    }
+
+    // Deliver post-change notification.
+    itemChange(QGraphicsItem::ItemSelectedHasChanged, quint32(d_ptr->selected));
+}
+
+/*!
+    \since 4.5
+
+    Returns this item's local opacity, which is between 0.0 (transparent) and
+    1.0 (opaque). This value is combined with parent and ancestor values into
+    the effectiveOpacity(). The effective opacity decides how the item is
+    rendered.
+
+    The opacity property decides the state of the painter passed to the
+    paint() function. If the item is cached, i.e., ItemCoordinateCache or
+    DeviceCoordinateCache, the effective property will be applied to the item's
+    cache as it is rendered.
+
+    The default opacity is 1.0; fully opaque.
+
+    \sa setOpacity(), paint(), ItemIgnoresParentOpacity,
+    ItemDoesntPropagateOpacityToChildren
+*/
+qreal QGraphicsItem::opacity() const
+{
+    if (d_ptr->hasOpacity) {
+        QVariant o = d_ptr->extra(QGraphicsItemPrivate::ExtraOpacity);
+        if (!o.isNull())
+            return o.toDouble();
+    }
+    return qreal(1.0);
+}
+
+/*!
+    \since 4.5
+
+    Returns this item's \e effective opacity, which is between 0.0
+    (transparent) and 1.0 (opaque). This value is a combination of this item's
+    local opacity, and its parent and ancestors' opacities. The effective
+    opacity decides how the item is rendered.
+
+    \sa opacity(), setOpacity(), paint(), ItemIgnoresParentOpacity,
+    ItemDoesntPropagateOpacityToChildren
+*/
+qreal QGraphicsItem::effectiveOpacity() const
+{
+    QVariant effectiveOpacity = d_ptr->extra(QGraphicsItemPrivate::ExtraEffectiveOpacity);
+    return effectiveOpacity.isNull() ? qreal(1.0) : qreal(effectiveOpacity.toDouble());
+}
+
+/*!
+    \since 4.5
+
+    Sets this item's local \a opacity, between 0.0 (transparent) and 1.0
+    (opaque). The item's local opacity is combined with parent and ancestor
+    opacities into the effectiveOpacity().
+
+    By default, opacity propagates from parent to child, so if a parent's
+    opacity is 0.5 and the child is also 0.5, the child's effective opacity
+    will be 0.25.
+
+    The opacity property decides the state of the painter passed to the
+    paint() function. If the item is cached, i.e., ItemCoordinateCache or
+    DeviceCoordinateCache, the effective property will be applied to the
+    item's cache as it is rendered.
+
+    There are two item flags that affect how the item's opacity is combined
+    with the parent: ItemIgnoresParentOpacity and
+    ItemDoesntPropagateOpacityToChildren.
+
+    \sa opacity(), effectiveOpacity()
+*/
+void QGraphicsItem::setOpacity(qreal opacity)
+{
+    // Notify change.
+    qreal newOpacity = itemChange(ItemOpacityChange, double(opacity)).toDouble();
+
+    // Normalize.
+    newOpacity = qBound<qreal>(0.0, newOpacity, 1.0);
+
+    // No change? Done.
+    if (qFuzzyCompare(newOpacity, this->opacity()))
+        return;
+
+    // Assign local opacity.
+    if (qFuzzyCompare(newOpacity, qreal(1.0))) {
+        // Opaque, unset opacity.
+        d_ptr->hasOpacity = 0;
+        d_ptr->unsetExtra(QGraphicsItemPrivate::ExtraOpacity);
+    } else {
+        d_ptr->hasOpacity = 1;
+        d_ptr->setExtra(QGraphicsItemPrivate::ExtraOpacity, double(newOpacity));
+    }
+
+    // Resolve effective opacity.
+    if (QGraphicsItem *p = d_ptr->parent)
+        d_ptr->resolveEffectiveOpacity(p->effectiveOpacity());
+    else
+        d_ptr->resolveEffectiveOpacity(1.0);
+
+    // Notify change.
+    itemChange(ItemOpacityHasChanged, newOpacity);
+
+    // Update.
+    d_ptr->fullUpdateHelper();
+}
+
+/*!
+   Returns true if this item can accept drag and drop events; otherwise,
+   returns false. By default, items do not accept drag and drop events; items
+   are transparent to drag and drop.
+
+   \sa setAcceptDrops()
+*/
+bool QGraphicsItem::acceptDrops() const
+{
+    return d_ptr->acceptDrops;
+}
+
+/*!
+    If \a on is true, this item will accept drag and drop events; otherwise,
+    it is transparent for drag and drop events. By default, items do not
+    accept drag and drop events.
+
+    \sa acceptDrops()
+*/
+void QGraphicsItem::setAcceptDrops(bool on)
+{
+    d_ptr->acceptDrops = on;
+}
+
+/*!
+    Returns the mouse buttons that this item accepts mouse events for.  By
+    default, all mouse buttons are accepted.
+
+    If an item accepts a mouse button, it will become the mouse
+    grabber item when a mouse press event is delivered for that mouse
+    button. However, if the item does not accept the button,
+    QGraphicsScene will forward the mouse events to the first item
+    beneath it that does.
+
+    \sa setAcceptedMouseButtons(), mousePressEvent()
+*/
+Qt::MouseButtons QGraphicsItem::acceptedMouseButtons() const
+{
+    return Qt::MouseButtons(d_ptr->acceptedMouseButtons);
+}
+
+/*!
+    Sets the mouse \a buttons that this item accepts mouse events for.
+
+    By default, all mouse buttons are accepted. If an item accepts a
+    mouse button, it will become the mouse grabber item when a mouse
+    press event is delivered for that button. However, if the item
+    does not accept the mouse button, QGraphicsScene will forward the
+    mouse events to the first item beneath it that does.
+
+    To disable mouse events for an item (i.e., make it transparent for mouse
+    events), call setAcceptedMouseButtons(0).
+
+    \sa acceptedMouseButtons(), mousePressEvent()
+*/
+void QGraphicsItem::setAcceptedMouseButtons(Qt::MouseButtons buttons)
+{
+    if (Qt::MouseButtons(d_ptr->acceptedMouseButtons) != buttons) {
+        if (buttons == 0 && d_ptr->scene && d_ptr->scene->mouseGrabberItem() == this
+            && d_ptr->scene->d_func()->lastMouseGrabberItemHasImplicitMouseGrab) {
+            ungrabMouse();
+        }
+        d_ptr->acceptedMouseButtons = quint32(buttons);
+    }
+}
+
+/*!
+    \since 4.4
+
+    Returns true if an item accepts hover events
+    (QGraphicsSceneHoverEvent); otherwise, returns false. By default,
+    items do not accept hover events.
+
+    \sa setAcceptedMouseButtons()
+*/
+bool QGraphicsItem::acceptHoverEvents() const
+{
+    return d_ptr->acceptsHover;
+}
+
+/*!
+    \obsolete
+
+    Call acceptHoverEvents() instead.
+*/
+bool QGraphicsItem::acceptsHoverEvents() const
+{
+    return d_ptr->acceptsHover;
+}
+
+/*!
+    \since 4.4
+
+    If \a enabled is true, this item will accept hover events;
+    otherwise, it will ignore them. By default, items do not accept
+    hover events.
+
+    Hover events are delivered when there is no current mouse grabber
+    item.  They are sent when the mouse cursor enters an item, when it
+    moves around inside the item, and when the cursor leaves an
+    item. Hover events are commonly used to highlight an item when
+    it's entered, and for tracking the mouse cursor as it hovers over
+    the item (equivalent to QWidget::mouseTracking).
+
+    Parent items receive hover enter events before their children, and
+    leave events after their children. The parent does not receive a
+    hover leave event if the cursor enters a child, though; the parent
+    stays "hovered" until the cursor leaves its area, including its
+    children's areas.
+
+    If a parent item handles child events (setHandlesChildEvents()), it will
+    receive hover move, drag move, and drop events as the cursor passes
+    through its children, but it does not receive hover enter and hover leave,
+    nor drag enter and drag leave events on behalf of its children.
+
+    A QGraphicsWidget with window decorations will accept hover events
+    regardless of the value of acceptHoverEvents().
+
+    \sa acceptHoverEvents(), hoverEnterEvent(), hoverMoveEvent(),
+    hoverLeaveEvent()
+*/
+void QGraphicsItem::setAcceptHoverEvents(bool enabled)
+{
+    d_ptr->acceptsHover = quint32(enabled);
+}
+
+/*!
+    \obsolete
+
+    Use setAcceptHoverEvents(\a enabled) instead.
+*/
+void QGraphicsItem::setAcceptsHoverEvents(bool enabled)
+{
+    d_ptr->acceptsHover = quint32(enabled);
+}
+
+/*!
+    Returns true if this item handles child events (i.e., all events
+    intended for any of its children are instead sent to this item);
+    otherwise, false is returned.
+
+    This property is useful for item groups; it allows one item to
+    handle events on behalf of its children, as opposed to its
+    children handling their events individually.
+
+    The default is to return false; children handle their own events.
+    The exception for this is if the item is a QGraphicsItemGroup, then
+    it defaults to return true.
+
+    \sa setHandlesChildEvents()
+*/
+bool QGraphicsItem::handlesChildEvents() const
+{
+    return d_ptr->handlesChildEvents;
+}
+
+/*!
+    If \a enabled is true, this item is set to handle all events for
+    all its children (i.e., all events intented for any of its
+    children are instead sent to this item); otherwise, if \a enabled
+    is false, this item will only handle its own events. The default
+    value is false.
+
+    This property is useful for item groups; it allows one item to
+    handle events on behalf of its children, as opposed to its
+    children handling their events individually.
+
+    If a child item accepts hover events, its parent will receive
+    hover move events as the cursor passes through the child, but it
+    does not receive hover enter and hover leave events on behalf of
+    its child.
+
+    \sa handlesChildEvents()
+*/
+void QGraphicsItem::setHandlesChildEvents(bool enabled)
+{
+    if (d_ptr->handlesChildEvents == enabled)
+        return;
+
+    d_ptr->handlesChildEvents = enabled;
+    d_ptr->updateAncestorFlag(QGraphicsItem::GraphicsItemFlag(-1));
+}
+
+/*!
+    Returns true if this item has keyboard input focus; otherwise, returns
+    false.
+
+    \sa QGraphicsScene::focusItem(), setFocus(), QGraphicsScene::setFocusItem()
+*/
+bool QGraphicsItem::hasFocus() const
+{
+    return (d_ptr->scene && d_ptr->scene->focusItem() == this);
+}
+
+/*!
+    Gives keyboard input focus to this item. The \a focusReason argument will
+    be passed into any focus event generated by this function; it is used to
+    give an explanation of what caused the item to get focus.
+
+    Only items that set the ItemIsFocusable flag can accept keyboard focus.
+
+    If this item is not visible (i.e., isVisible() returns false), not
+    enabled, not associated with a scene, or if it already has input focus,
+    this function will do nothing.
+
+    As a result of calling this function, this item will receive a focus in
+    event with \a focusReason. If another item already has focus, that item
+    will first receive a focus out event indicating that it has lost input
+    focus.
+
+    \sa clearFocus(), hasFocus()
+*/
+void QGraphicsItem::setFocus(Qt::FocusReason focusReason)
+{
+    if (!d_ptr->scene || !isEnabled() || hasFocus() || !(d_ptr->flags & ItemIsFocusable))
+        return;
+    if (isVisible()) {
+        // Visible items immediately gain focus from scene.
+        d_ptr->scene->setFocusItem(this, focusReason);
+    } else if (d_ptr->isWidget) {
+        // Just set up subfocus.
+        static_cast<QGraphicsWidget *>(this)->d_func()->setFocusWidget();
+    }
+}
+
+/*!
+    Takes keyboard input focus from the item.
+
+    If it has focus, a focus out event is sent to this item to tell it that it
+    is about to lose the focus.
+
+    Only items that set the ItemIsFocusable flag, or widgets that set an
+    appropriate focus policy, can accept keyboard focus.
+
+    \sa setFocus(), QGraphicsWidget::focusPolicy
+*/
+void QGraphicsItem::clearFocus()
+{
+    if (!d_ptr->scene)
+        return;
+    if (d_ptr->isWidget) {
+        // Invisible widget items with focus must explicitly clear subfocus.
+        static_cast<QGraphicsWidget *>(this)->d_func()->clearFocusWidget();
+    }
+    if (d_ptr->scene->focusItem() == this) {
+        // If this item has the scene's input focus, clear it.
+        d_ptr->scene->setFocusItem(0);
+    }
+}
+
+/*!
+    \since 4.4
+    Grabs the mouse input.
+
+    This item will receive all mouse events for the scene until any of the
+    following events occurs:
+
+    \list
+    \o The item becomes invisible
+    \o The item is removed from the scene
+    \o The item is deleted
+    \o The item call ungrabMouse()
+    \o Another item calls grabMouse(); the item will regain the mouse grab
+    when the other item calls ungrabMouse().
+    \endlist
+
+    When an item gains the mouse grab, it receives a QEvent::GrabMouse
+    event. When it loses the mouse grab, it receives a QEvent::UngrabMouse
+    event. These events can be used to detect when your item gains or loses
+    the mouse grab through other means than receiving mouse button events.
+
+    It is almost never necessary to explicitly grab the mouse in Qt, as Qt
+    grabs and releases it sensibly. In particular, Qt grabs the mouse when you
+    press a mouse button, and keeps the mouse grabbed until you release the
+    last mouse button. Also, Qt::Popup widgets implicitly call grabMouse()
+    when shown, and ungrabMouse() when hidden.
+
+    Note that only visible items can grab mouse input. Calling grabMouse() on
+    an invisible item has no effect.
+
+    Keyboard events are not affected.
+
+    \sa QGraphicsScene::mouseGrabberItem(), ungrabMouse(), grabKeyboard()
+*/
+void QGraphicsItem::grabMouse()
+{
+    if (!d_ptr->scene) {
+        qWarning("QGraphicsItem::grabMouse: cannot grab mouse without scene");
+        return;
+    }
+    if (!d_ptr->visible) {
+        qWarning("QGraphicsItem::grabMouse: cannot grab mouse while invisible");
+        return;
+    }
+    d_ptr->scene->d_func()->grabMouse(this);
+}
+
+/*!
+    \since 4.4
+    Releases the mouse grab.
+
+    \sa grabMouse(), ungrabKeyboard()
+*/
+void QGraphicsItem::ungrabMouse()
+{
+    if (!d_ptr->scene) {
+        qWarning("QGraphicsItem::ungrabMouse: cannot ungrab mouse without scene");
+        return;
+    }
+    d_ptr->scene->d_func()->ungrabMouse(this);
+}
+
+/*!
+    \since 4.4
+    Grabs the keyboard input.
+
+    The item will receive all keyboard input to the scene until one of the
+    following events occur:
+
+    \list
+    \o The item becomes invisible
+    \o The item is removed from the scene
+    \o The item is deleted
+    \o The item calls ungrabKeyboard()
+    \o Another item calls grabKeyboard(); the item will regain the keyboard grab
+    when the other item calls ungrabKeyboard().
+    \endlist
+
+    When an item gains the keyboard grab, it receives a QEvent::GrabKeyboard
+    event. When it loses the keyboard grab, it receives a
+    QEvent::UngrabKeyboard event. These events can be used to detect when your
+    item gains or loses the keyboard grab through other means than gaining
+    input focus.
+
+    It is almost never necessary to explicitly grab the keyboard in Qt, as Qt
+    grabs and releases it sensibly. In particular, Qt grabs the keyboard when
+    your item gains input focus, and releases it when your item loses input
+    focus, or when the item is hidden.
+
+    Note that only visible items can grab keyboard input. Calling
+    grabKeyboard() on an invisible item has no effect.
+
+    Keyboard events are not affected.
+
+    \sa ungrabKeyboard(), grabMouse(), setFocus()
+*/
+void QGraphicsItem::grabKeyboard()
+{
+    if (!d_ptr->scene) {
+        qWarning("QGraphicsItem::grabKeyboard: cannot grab keyboard without scene");
+        return;
+    }
+    if (!d_ptr->visible) {
+        qWarning("QGraphicsItem::grabKeyboard: cannot grab keyboard while invisible");
+        return;
+    }
+    d_ptr->scene->d_func()->grabKeyboard(this);
+}
+
+/*!
+    \since 4.4
+    Releases the keyboard grab.
+
+    \sa grabKeyboard(), ungrabMouse()
+*/
+void QGraphicsItem::ungrabKeyboard()
+{
+    if (!d_ptr->scene) {
+        qWarning("QGraphicsItem::ungrabKeyboard: cannot ungrab keyboard without scene");
+        return;
+    }
+    d_ptr->scene->d_func()->ungrabKeyboard(this);
+}
+
+/*!
+    Returns the position of the item in parent coordinates. If the item has no
+    parent, its position is given in scene coordinates.
+
+    The position of the item describes its origin (local coordinate
+    (0, 0)) in parent coordinates; this function returns the same as
+    mapToParent(0, 0).
+
+    For convenience, you can also call scenePos() to determine the
+    item's position in scene coordinates, regardless of its parent.
+
+    \sa x(), y(), setPos(), matrix(), {The Graphics View Coordinate System}
+*/
+QPointF QGraphicsItem::pos() const
+{
+    return d_ptr->pos;
+}
+
+/*!
+    \fn QGraphicsItem::x() const
+
+    This convenience function is equivalent to calling pos().x().
+
+    \sa y()
+*/
+
+/*!
+    \fn QGraphicsItem::y() const
+
+    This convenience function is equivalent to calling pos().y().
+
+    \sa x()
+*/
+
+/*!
+    Returns the item's position in scene coordinates. This is
+    equivalent to calling \c mapToScene(0, 0).
+
+    \sa pos(), sceneTransform(), {The Graphics View Coordinate System}
+*/
+QPointF QGraphicsItem::scenePos() const
+{
+    return mapToScene(0, 0);
+}
+
+/*!
+    \internal
+
+    Sets the position \a pos and notifies the change. If \a update is true,
+    the item is also updated; otherwise it is not updated before and after the
+    change.
+*/
+void QGraphicsItemPrivate::setPosHelper(const QPointF &pos, bool update)
+{
+    Q_Q(QGraphicsItem);
+    if (this->pos == pos)
+        return;
+
+    // Notify the item that the position is changing.
+    QPointF newPos = q->itemChange(QGraphicsItem::ItemPositionChange, pos).toPointF();
+    if (newPos == this->pos)
+        return;
+
+    // Update and repositition.
+    if (scene && update) {
+        fullUpdateHelper(true);
+        q->prepareGeometryChange();
+    }
+    this->pos = newPos;
+    invalidateSceneTransformCache();
+
+    // Send post-notification.
+    q->itemChange(QGraphicsItem::ItemPositionHasChanged, newPos);
+}
+
+/*!
+    Sets the position of the item to \a pos, which is in parent
+    coordinates.  For items with no parent, \a pos is in scene
+    coordinates.
+
+    The position of the item describes its origin (local coordinate
+    (0, 0)) in parent coordinates.
+
+    \sa pos(), scenePos(), {The Graphics View Coordinate System}
+*/
+void QGraphicsItem::setPos(const QPointF &pos)
+{
+    d_ptr->setPosHelper(pos, /* update = */ true);
+}
+
+/*!
+    \fn void QGraphicsItem::setPos(qreal x, qreal y)
+    \overload
+
+    This convenience function is equivalent to calling setPos(QPointF(\a x, \a
+    y)).
+*/
+
+/*!
+    \fn void QGraphicsItem::moveBy(qreal dx, qreal dy)
+
+    Moves the item by \a dx points horizontally, and \a dy point
+    vertically. This function is equivalent to calling setPos(pos() +
+    QPointF(\a dx, \a dy)).
+*/
+
+/*!
+    If this item is part of a scene that is viewed by a QGraphicsView, this
+    convenience function will attempt to scroll the view to ensure that \a
+    rect is visible inside the view's viewport. If \a rect is a null rect (the
+    default), QGraphicsItem will default to the item's bounding rect. \a xmargin
+    and \a ymargin are the number of pixels the view should use for margins.
+
+    If the specified rect cannot be reached, the contents are scrolled to the
+    nearest valid position.
+
+    If this item is not viewed by a QGraphicsView, this function does nothing.
+
+    \sa QGraphicsView::ensureVisible()
+*/
+void QGraphicsItem::ensureVisible(const QRectF &rect, int xmargin, int ymargin)
+{
+    if (d_ptr->scene) {
+        QRectF sceneRect;
+        if (!rect.isNull())
+            sceneRect = sceneTransform().mapRect(rect);
+        else
+            sceneRect = sceneBoundingRect();
+        foreach (QGraphicsView *view, d_ptr->scene->d_func()->views)
+            view->ensureVisible(sceneRect, xmargin, ymargin);
+    }
+}
+
+/*!
+    \fn void QGraphicsItem::ensureVisible(qreal x, qreal y, qreal w, qreal h,
+    int xmargin = 50, int ymargin = 50)
+
+    This convenience function is equivalent to calling
+    ensureVisible(QRectF(\a x, \a y, \a w, \a h), \a xmargin, \a ymargin):
+*/
+
+/*!
+    \obsolete
+
+    Returns the item's affine transformation matrix. This is a subset or the
+    item's full transformation matrix, and might not represent the item's full
+    transformation.
+
+    Use transform() instead.
+
+    \sa setTransform(), sceneTransform()
+*/
+QMatrix QGraphicsItem::matrix() const
+{
+    return transform().toAffine();
+}
+
+/*!
+    \since 4.3
+
+    Returns this item's transformation matrix. If no matrix has been set, the
+    identity matrix is returned.
+
+    \sa setTransform(), sceneTransform()
+*/
+QTransform QGraphicsItem::transform() const
+{
+    if (!d_ptr->hasTransform)
+        return QTransform();
+    QGraphicsItemPrivate::TransformData *transformData = static_cast<QGraphicsItemPrivate::TransformData *>(
+                            qVariantValue<void *>(d_ptr->extra(QGraphicsItemPrivate::ExtraTransform)));
+    Q_ASSERT(transformData);
+    if (transformData->dirty) {
+        QGraphicsItem *that = const_cast<QGraphicsItem *>(this);
+        QTransform newTransform;
+        QPointF center = transformData->transformCenter;
+        newTransform.translate(center.x(), center.y());
+        newTransform.rotate(transformData->rotationZ, Qt::ZAxis);
+        newTransform.rotate(transformData->rotationY, Qt::YAxis);
+        newTransform.rotate(transformData->rotationX, Qt::XAxis);
+        newTransform.scale(transformData->scaleX, transformData->scaleY);
+        newTransform *= transformData->baseTransform;
+        newTransform.translate(-center.x(), -center.y());
+        transformData->transform = newTransform;
+        transformData->dirty = false;
+    }
+    return transformData->transform;
+}
+
+/*!
+    \obsolete
+
+    Use sceneTransform() instead.
+
+    \sa transform(), setTransform(), scenePos(), {The Graphics View Coordinate System}
+*/
+QMatrix QGraphicsItem::sceneMatrix() const
+{
+    return sceneTransform().toAffine();
+}
+
+
+/*!
+    \since 4.3
+
+    Returns this item's scene transformation matrix. This matrix can be used
+    to map coordinates and geometrical shapes from this item's local
+    coordinate system to the scene's coordinate system. To map coordinates
+    from the scene, you must first invert the returned matrix.
+
+    Example:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsitem.cpp 4
+
+    Unlike transform(), which returns only an item's local transformation, this
+    function includes the item's (and any parents') position.
+
+    \sa transform(), setTransform(), scenePos(), {The Graphics View Coordinate System}
+*/
+QTransform QGraphicsItem::sceneTransform() const
+{
+    // Check if there's any entry in the transform cache.
+    QGraphicsScenePrivate *sd = d_ptr->scene ? d_ptr->scene->d_func() : 0;
+    int index = d_ptr->sceneTransformIndex;
+    if (sd && index != -1 && sd->validTransforms.testBit(index))
+        return sd->sceneTransformCache[index];
+
+    // Calculate local transform.
+    QTransform m;
+    if (d_ptr->hasTransform) {
+        m = transform();
+        m *= QTransform::fromTranslate(d_ptr->pos.x(), d_ptr->pos.y());
+    } else {
+        // ### ? QTransform::fromTranslate(d_ptr->pos.x(), d_ptr->pos.y())
+        m.translate(d_ptr->pos.x(), d_ptr->pos.y());
+    }
+
+    // Combine with parent and add to cache.
+    if (d_ptr->parent) {
+        m *= d_ptr->parent->sceneTransform();
+        // Don't cache toplevels
+        if (sd) {
+            if (index == -1) {
+                if (!sd->freeSceneTransformSlots.isEmpty()) {
+                    index = sd->freeSceneTransformSlots.last();
+                    sd->freeSceneTransformSlots.pop_back();
+                } else {
+                    index = sd->sceneTransformCache.size();
+                }
+                d_ptr->sceneTransformIndex = index;
+                if (index >= sd->validTransforms.size()) {
+                    sd->validTransforms.resize(index + 1);
+                    sd->sceneTransformCache.resize(index + 1);
+                }
+            }
+            sd->validTransforms.setBit(index, 1);
+            sd->sceneTransformCache[index] = m;
+        }
+    }
+    return m;
+}
+
+/*!
+    \since 4.3
+
+    Returns this item's device transformation matrix, using \a
+    viewportTransform to map from scene to device coordinates. This matrix can
+    be used to map coordinates and geometrical shapes from this item's local
+    coordinate system to the viewport's (or any device's) coordinate
+    system. To map coordinates from the viewport, you must first invert the
+    returned matrix.
+
+    Example:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsitem.cpp 5
+
+    This function is the same as combining this item's scene transform with
+    the view's viewport transform, but it also understands the
+    ItemIgnoresTransformations flag. The device transform can be used to do
+    accurate coordinate mapping (and collision detection) for untransformable
+    items.
+
+    \sa transform(), setTransform(), scenePos(), {The Graphics View Coordinate
+    System}, itemTransform()
+*/
+QTransform QGraphicsItem::deviceTransform(const QTransform &viewportTransform) const
+{
+    // Find the topmost item that ignores view transformations.
+    const QGraphicsItem *untransformedAncestor = this;
+    QList<const QGraphicsItem *> parents;
+    while (untransformedAncestor && ((untransformedAncestor->d_ptr->ancestorFlags
+                                     & QGraphicsItemPrivate::AncestorIgnoresTransformations))) {
+        parents.prepend(untransformedAncestor);
+        untransformedAncestor = untransformedAncestor->parentItem();
+    }
+
+    if (!untransformedAncestor) {
+        // Assert in debug mode, continue in release.
+        Q_ASSERT_X(untransformedAncestor, "QGraphicsItem::deviceTransform",
+                   "Invalid object structure!");
+        return QTransform();
+    }
+
+    // First translate the base untransformable item.
+    QPointF mappedPoint = (untransformedAncestor->sceneTransform() * viewportTransform).map(QPointF(0, 0));
+    QTransform matrix;
+    matrix.translate(mappedPoint.x(), mappedPoint.y());
+    matrix = untransformedAncestor->transform() * matrix;
+
+    // Then transform and translate all children.
+    for (int i = 0; i < parents.size(); ++i) {
+        const QGraphicsItem *parent = parents.at(i);
+        QPointF pos = parent->pos();
+        QTransform moveMatrix;
+        moveMatrix.translate(pos.x(), pos.y());
+        matrix = (parent->transform() * moveMatrix) * matrix;
+    }
+
+    return matrix;
+}
+
+/*!
+    \since 4.5
+
+    Returns a QTransform that maps coordinates from this item to \a other. If
+    \a ok is not null, and if there is no such transform, the boolean pointed
+    to by \a ok will be set to false; otherwise it will be set to true.
+
+    This transform provides an alternative to the mapToItem() or mapFromItem()
+    functions, by returning the appropriate transform so that you can map
+    shapes and coordinates yourself. It also helps you write more efficient
+    code when repeatedly mapping between the same two items.
+
+    \note In rare circumstances, there is no transform that maps between two
+    items.
+
+    \sa mapToItem(), mapFromItem(), deviceTransform()
+*/
+QTransform QGraphicsItem::itemTransform(const QGraphicsItem *other, bool *ok) const
+{
+    // Catch simple cases first.
+    if (other == 0) {
+        qWarning("QGraphicsItem::itemTransform: null pointer passed");
+        return QTransform();
+    }
+    if (other == this) {
+        if (ok)
+            *ok = true;
+        return QTransform();
+    }
+
+    QGraphicsItem *parent = d_ptr->parent;
+    const QGraphicsItem *otherParent = other->d_ptr->parent;
+
+    // This is other's child
+    if (parent == other) {
+        if (ok)
+            *ok = true;
+        const QPointF &itemPos = d_ptr->pos;
+        if (d_ptr->hasTransform)
+            return transform() * QTransform::fromTranslate(itemPos.x(), itemPos.y());
+        return QTransform::fromTranslate(itemPos.x(), itemPos.y());
+    }
+
+    // This is other's parent
+    if (otherParent == this) {
+        const QPointF &otherPos = other->d_ptr->pos;
+        if (other->d_ptr->hasTransform) {
+            QTransform otherToParent = other->transform();
+            otherToParent *= QTransform::fromTranslate(otherPos.x(), otherPos.y());
+            return otherToParent.inverted(ok);
+        } else {
+            if (ok)
+                *ok = true;
+            return QTransform::fromTranslate(-otherPos.x(), -otherPos.y());
+        }
+    }
+
+    // Siblings
+    if (parent == otherParent) {
+        bool hasTr = d_ptr->hasTransform;
+        bool otherHasTr = other->d_ptr->hasTransform;
+        const QPointF &itemPos = d_ptr->pos;
+        const QPointF &otherPos = other->d_ptr->pos;
+
+        if (!hasTr && !otherHasTr) {
+            QPointF delta = itemPos - otherPos;
+            if (ok)
+                *ok = true;
+            return QTransform::fromTranslate(delta.x(), delta.y());
+        }
+
+        QTransform itemToParent = QTransform::fromTranslate(itemPos.x(), itemPos.y());
+        if (hasTr)
+            itemToParent = transform() * itemToParent;
+
+        QTransform otherToParent = QTransform::fromTranslate(otherPos.x(), otherPos.y());
+        if (otherHasTr)
+            otherToParent = other->transform() * otherToParent;
+
+        return itemToParent * otherToParent.inverted(ok);
+    }
+
+    // Find the closest common ancestor. If the two items don't share an
+    // ancestor, then the only way is to combine their scene transforms.
+    const QGraphicsItem *commonAncestor = commonAncestorItem(other);
+    if (!commonAncestor)
+        return sceneTransform() * other->sceneTransform().inverted(ok);
+
+    // If the two items are cousins (in sibling branches), map both to the
+    // common ancestor, and combine the two transforms.
+    bool cousins = other != commonAncestor && this != commonAncestor;
+    if (cousins) {
+        bool good = false;
+        QTransform thisToScene;
+        QTransform otherToScene;
+        thisToScene = itemTransform(commonAncestor, &good);
+        if (good)
+            otherToScene = other->itemTransform(commonAncestor, &good);
+        if (!good) {
+            if (ok)
+                *ok = false;
+            return QTransform();
+        }
+        return thisToScene * otherToScene.inverted(ok);
+    }
+
+    // One is an ancestor of the other; walk the chain.
+    bool parentOfOther = isAncestorOf(other);
+    const QGraphicsItem *child = parentOfOther ? other : this;
+    const QGraphicsItem *root = parentOfOther ? this : other;
+
+    QTransform x;
+    const QGraphicsItem *p = child;
+    do {
+        const QGraphicsItemPrivate *pd = p->d_ptr;
+        if (pd->hasTransform)
+            x *= p->transform();
+        x *= QTransform::fromTranslate(pd->pos.x(), pd->pos.y());
+    } while ((p = p->d_ptr->parent) && p != root);
+    if (parentOfOther)
+        return x.inverted(ok);
+    if (ok)
+        *ok = true;
+    return x;
+}
+
+/*!
+    \obsolete
+
+    Sets the item's affine transformation matrix. This is a subset or the
+    item's full transformation matrix, and might not represent the item's full
+    transformation.
+
+    Use setTransform() instead.
+
+    \sa transform(), rotate(), scale(), shear(), translate(), {The Graphics View Coordinate System}
+*/
+void QGraphicsItem::setMatrix(const QMatrix &matrix, bool combine)
+{
+    QGraphicsItemPrivate::TransformData *transformData = static_cast<QGraphicsItemPrivate::TransformData *>(
+                            qVariantValue<void *>(d_ptr->extra(QGraphicsItemPrivate::ExtraTransform)));
+    if (!transformData) {
+        if (matrix.isIdentity())
+            return;
+        transformData = new QGraphicsItemPrivate::TransformData;
+        d_ptr->setExtra(QGraphicsItemPrivate::ExtraTransform, qVariantFromValue<void *>(transformData));
+    }
+    
+    QTransform oldTransform = transformData->baseTransform;
+
+    QTransform newTransform;
+    if (!combine)
+        newTransform = QTransform(matrix);
+    else
+        newTransform = QTransform(matrix) * oldTransform;
+    if (oldTransform == newTransform)
+        return;
+
+    // Notify the item that the transformation matrix is changing.
+    QVariant variant;
+    qVariantSetValue<QMatrix>(variant, newTransform.toAffine());
+    newTransform = QTransform(qVariantValue<QMatrix>(itemChange(ItemMatrixChange, variant)));
+
+    if (oldTransform == newTransform)
+        return;
+
+    // Update and set the new transformation.
+    d_ptr->fullUpdateHelper(true);
+    prepareGeometryChange();
+    transformData->baseTransform = newTransform;
+    transformData->dirty = true;
+    d_ptr->hasTransform = true;
+    d_ptr->invalidateSceneTransformCache();
+
+    // Send post-notification.
+    itemChange(ItemTransformHasChanged, newTransform);
+}
+
+/*!
+    \since 4.3
+
+    Sets the item's current transformation matrix to \a matrix.
+
+    If \a combine is true, then \a matrix is combined with the current matrix;
+    otherwise, \a matrix \e replaces the current matrix. \a combine is false
+    by default.
+
+    To simplify interation with items using a transformed view, QGraphicsItem
+    provides mapTo... and mapFrom... functions that can translate between
+    items' and the scene's coordinates. For example, you can call mapToScene()
+    to map an item coordiate to a scene coordinate, or mapFromScene() to map
+    from scene coordinates to item coordinates.
+
+    \sa transform(), rotate(), scale(), shear(), translate(), {The Graphics View Coordinate System}
+*/
+void QGraphicsItem::setTransform(const QTransform &matrix, bool combine)
+{
+    QGraphicsItemPrivate::TransformData *transformData = static_cast<QGraphicsItemPrivate::TransformData *>(
+                            qVariantValue<void *>(d_ptr->extra(QGraphicsItemPrivate::ExtraTransform)));
+    if (!transformData) {
+        if (matrix.isIdentity())
+            return;
+        transformData = new QGraphicsItemPrivate::TransformData;
+        d_ptr->setExtra(QGraphicsItemPrivate::ExtraTransform, qVariantFromValue<void *>(transformData));
+    }
+    
+    QTransform oldTransform = transformData->baseTransform;
+
+    QTransform newTransform;
+    if (!combine)
+        newTransform = matrix;
+    else
+        newTransform = matrix * oldTransform;
+    if (oldTransform == newTransform)
+        return;
+
+    // Notify the item that the transformation matrix is changing.
+    QVariant variant;
+    qVariantSetValue<QTransform>(variant, newTransform);
+    newTransform = qVariantValue<QTransform>(itemChange(ItemTransformChange, variant));
+    if (oldTransform == newTransform)
+        return;
+
+    // Update and set the new transformation.
+    d_ptr->fullUpdateHelper(true);
+    prepareGeometryChange();
+    transformData->baseTransform = newTransform;
+    transformData->dirty = true;
+    d_ptr->hasTransform = true;
+    transform(); // ### update transform, bad!
+    d_ptr->invalidateSceneTransformCache();
+
+    // Send post-notification.
+    itemChange(ItemTransformHasChanged, newTransform);
+}
+
+/*!
+    \obsolete
+
+    Use resetTransform() instead.
+*/
+void QGraphicsItem::resetMatrix()
+{
+    resetTransform();
+}
+
+/*!
+    \since 4.3
+
+    Resets this item's transformation matrix to the identity matrix. This is
+    equivalent to calling \c setTransform(QTransform()).
+
+    \sa setTransform(), transform()
+*/
+void QGraphicsItem::resetTransform()
+{
+    setTransform(QTransform(), false);
+}
+
+/*!
+    Rotates the current item transformation \a angle degrees clockwise around
+    its origin. To translate around an arbitrary point (x, y), you need to
+    combine translation and rotation with setTransform().
+
+    Example:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsitem.cpp 6
+
+    \sa setTransform(), transform(), scale(), shear(), translate()
+*/
+void QGraphicsItem::rotate(qreal angle)
+{
+    setTransform(QTransform().rotate(angle), true);
+}
+
+/*!
+    Scales the current item transformation by (\a sx, \a sy) around its
+    origin. To scale from an arbitrary point (x, y), you need to combine
+    translation and scaling with setTransform().
+
+    Example:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsitem.cpp 7
+
+    \sa setTransform(), transform(), rotate(), shear(), translate()
+*/
+void QGraphicsItem::scale(qreal sx, qreal sy)
+{
+    setTransform(QTransform::fromScale(sx, sy), true);
+}
+
+/*!
+    Shears the current item transformation by (\a sh, \a sv).
+
+    \sa setTransform(), transform(), rotate(), scale(), translate()
+*/
+void QGraphicsItem::shear(qreal sh, qreal sv)
+{
+    setTransform(QTransform().shear(sh, sv), true);
+}
+
+/*!
+    Translates the current item transformation by (\a dx, \a dy).
+
+    If all you want is to move an item, you should call moveBy() or
+    setPos() instead; this function changes the item's translation,
+    which is conceptually separate from its position.
+
+    \sa setTransform(), transform(), rotate(), scale(), shear()
+*/
+void QGraphicsItem::translate(qreal dx, qreal dy)
+{
+    setTransform(QTransform::fromTranslate(dx, dy), true);
+}
+
+QPointF QGraphicsItem::transformOrigin() const
+{
+    QGraphicsItemPrivate::TransformData *transformData = static_cast<QGraphicsItemPrivate::TransformData *>(
+                            qVariantValue<void *>(d_ptr->extra(QGraphicsItemPrivate::ExtraTransform)));
+    if (!transformData)
+        return QPointF();
+ 
+    return transformData->transformCenter;
+}
+
+/*!
+    Set a center for all transformation
+*/
+void QGraphicsItem::setTransformOrigin(const QPointF &center)
+{
+    QGraphicsItemPrivate::TransformData *transformData = static_cast<QGraphicsItemPrivate::TransformData *>(
+                            qVariantValue<void *>(d_ptr->extra(QGraphicsItemPrivate::ExtraTransform)));
+    if (!transformData) {
+        if (center.isNull())
+            return;
+        transformData = new QGraphicsItemPrivate::TransformData;
+        d_ptr->setExtra(QGraphicsItemPrivate::ExtraTransform, qVariantFromValue<void *>(transformData));
+    }
+    if (transformData->transformCenter == center)
+        return;
+   
+    d_ptr->fullUpdateHelper(true);
+    prepareGeometryChange();
+    
+    transformData->transformCenter = center;
+
+    transformData->dirty = true;
+    d_ptr->hasTransform = true;
+    d_ptr->fullUpdateHelper();
+
+}
+
+qreal QGraphicsItem::xScale() const
+{
+    QGraphicsItemPrivate::TransformData *transformData = static_cast<QGraphicsItemPrivate::TransformData *>(
+                            qVariantValue<void *>(d_ptr->extra(QGraphicsItemPrivate::ExtraTransform)));
+    if (!transformData)
+        return 1;
+    
+    return transformData->scaleX; 
+}
+
+void QGraphicsItem::setXScale(qreal factor)
+{
+    QGraphicsItemPrivate::TransformData *transformData = static_cast<QGraphicsItemPrivate::TransformData *>(
+                            qVariantValue<void *>(d_ptr->extra(QGraphicsItemPrivate::ExtraTransform)));
+    if (!transformData) {
+        if (factor == 1)
+            return;
+        transformData = new QGraphicsItemPrivate::TransformData;
+        d_ptr->setExtra(QGraphicsItemPrivate::ExtraTransform, qVariantFromValue<void *>(transformData));
+    }
+    if (transformData->scaleX == factor)
+        return;  
+    
+    d_ptr->fullUpdateHelper(true);
+    prepareGeometryChange();
+    
+    transformData->scaleX = factor;
+    transformData->dirty = true;
+    d_ptr->hasTransform = true;
+    d_ptr->invalidateSceneTransformCache();
+}
+
+qreal QGraphicsItem::yScale() const
+{
+    QGraphicsItemPrivate::TransformData *transformData = static_cast<QGraphicsItemPrivate::TransformData *>(
+                            qVariantValue<void *>(d_ptr->extra(QGraphicsItemPrivate::ExtraTransform)));
+    if (!transformData)
+        return 1;
+    
+    return transformData->scaleY; 
+}
+
+void QGraphicsItem::setYScale(qreal factor)
+{
+    QGraphicsItemPrivate::TransformData *transformData = static_cast<QGraphicsItemPrivate::TransformData *>(
+                            qVariantValue<void *>(d_ptr->extra(QGraphicsItemPrivate::ExtraTransform)));
+    if (!transformData) {
+        if (factor == 1)
+            return;
+        transformData = new QGraphicsItemPrivate::TransformData;
+        d_ptr->setExtra(QGraphicsItemPrivate::ExtraTransform, qVariantFromValue<void *>(transformData));
+    }
+    if (transformData->scaleY == factor)
+        return;  
+    
+    d_ptr->fullUpdateHelper(true);
+    prepareGeometryChange();
+    
+    transformData->scaleY = factor;
+    transformData->dirty = true;
+    d_ptr->hasTransform = true;
+    d_ptr->invalidateSceneTransformCache();
+}
+
+qreal QGraphicsItem::xRotation() const
+{
+    QGraphicsItemPrivate::TransformData *transformData = static_cast<QGraphicsItemPrivate::TransformData *>(
+                            qVariantValue<void *>(d_ptr->extra(QGraphicsItemPrivate::ExtraTransform)));
+    if (!transformData)
+        return 0;
+    return transformData->rotationX;
+}
+
+void QGraphicsItem::setXRotation(qreal angle)
+{
+    QGraphicsItemPrivate::TransformData *transformData = static_cast<QGraphicsItemPrivate::TransformData *>(
+                            qVariantValue<void *>(d_ptr->extra(QGraphicsItemPrivate::ExtraTransform)));
+    if (!transformData) {
+        if (qFuzzyCompare(angle + 1, 1))
+            return;
+        transformData = new QGraphicsItemPrivate::TransformData;
+        d_ptr->setExtra(QGraphicsItemPrivate::ExtraTransform, qVariantFromValue<void *>(transformData));
+    }
+    
+    d_ptr->fullUpdateHelper(true);
+    prepareGeometryChange();
+
+    transformData->rotationX = angle;
+    
+    transformData->dirty = true;
+    d_ptr->hasTransform = true;
+    d_ptr->invalidateSceneTransformCache();
+}
+
+qreal QGraphicsItem::yRotation() const
+{
+    QGraphicsItemPrivate::TransformData *transformData = static_cast<QGraphicsItemPrivate::TransformData *>(
+                            qVariantValue<void *>(d_ptr->extra(QGraphicsItemPrivate::ExtraTransform)));
+    if (!transformData)
+        return 0;
+    return transformData->rotationY;
+}
+
+void QGraphicsItem::setYRotation(qreal angle)
+{
+    QGraphicsItemPrivate::TransformData *transformData = static_cast<QGraphicsItemPrivate::TransformData *>(
+                            qVariantValue<void *>(d_ptr->extra(QGraphicsItemPrivate::ExtraTransform)));
+    if (!transformData) {
+        if (qFuzzyCompare(angle + 1, 1))
+            return;
+        transformData = new QGraphicsItemPrivate::TransformData;
+        d_ptr->setExtra(QGraphicsItemPrivate::ExtraTransform, qVariantFromValue<void *>(transformData));
+    }
+    
+    d_ptr->fullUpdateHelper(true);
+    prepareGeometryChange();
+
+    transformData->rotationY = angle;
+    
+    transformData->dirty = true;
+    d_ptr->hasTransform = true;
+    d_ptr->invalidateSceneTransformCache();
+}
+
+qreal QGraphicsItem::zRotation() const
+{
+    QGraphicsItemPrivate::TransformData *transformData = static_cast<QGraphicsItemPrivate::TransformData *>(
+                            qVariantValue<void *>(d_ptr->extra(QGraphicsItemPrivate::ExtraTransform)));
+    if (!transformData)
+        return 0;
+    return transformData->rotationZ;
+}
+
+void QGraphicsItem::setZRotation(qreal angle)
+{
+    QGraphicsItemPrivate::TransformData *transformData = static_cast<QGraphicsItemPrivate::TransformData *>(
+                            qVariantValue<void *>(d_ptr->extra(QGraphicsItemPrivate::ExtraTransform)));
+    if (!transformData) {
+        if (qFuzzyCompare(angle + 1, 1))
+            return;
+        transformData = new QGraphicsItemPrivate::TransformData;
+        d_ptr->setExtra(QGraphicsItemPrivate::ExtraTransform, qVariantFromValue<void *>(transformData));
+    }
+    
+    d_ptr->fullUpdateHelper(true);
+    prepareGeometryChange();
+
+    transformData->rotationZ = angle;
+    
+    transformData->dirty = true;
+    d_ptr->hasTransform = true;
+    d_ptr->invalidateSceneTransformCache();
+}
+
+/*!
+    This virtual function is called twice for all items by the
+    QGraphicsScene::advance() slot. In the first phase, all items are called
+    with \a phase == 0, indicating that items on the scene are about to
+    advance, and then all items are called with \a phase == 1. Reimplement
+    this function to update your item if you need simple scene-controlled
+    animation.
+
+    The default implementation does nothing.
+
+    For individual item animation, an alternative to this function is to
+    either use QGraphicsItemAnimation, or to multiple-inherit from QObject and
+    QGraphicsItem, and animate your item using QObject::startTimer() and
+    QObject::timerEvent().
+
+    \sa QGraphicsItemAnimation, QTimeLine
+*/
+void QGraphicsItem::advance(int phase)
+{
+    Q_UNUSED(phase);
+}
+
+/*!
+    Returns the Z-value, or the elevation, of the item. The Z-value decides
+    the stacking order of sibling (neighboring) items.
+
+    The default Z-value is 0.
+
+    \sa setZValue()
+*/
+qreal QGraphicsItem::zValue() const
+{
+    return d_ptr->z;
+}
+
+/*!
+    Sets the Z-value, or the elevation, of the item, to \a z. The elevation
+    decides the stacking order of sibling (neighboring) items. An item of high
+    Z-value will be drawn on top of an item with a lower Z-value if they
+    share the same parent item. In addition, children of an item will always be drawn
+    on top of the parent, regardless of the child's Z-value. Sibling items
+    that share the same Z-value will be drawn in an undefined order, although
+    the order will stay the same for as long as the items live.
+
+    \img graphicsview-zorder.png
+
+    Children of different parents are stacked according to the Z-value of
+    each item's ancestor item which is an immediate child of the two
+    items' closest common ancestor. For example, a robot item might
+    define a torso item as the parent of a head item, two arm items,
+    and two upper-leg items. The upper-leg items would each be parents
+    of one lower-leg item, and each lower-leg item would be parents of
+    one foot item.  The stacking order of the feet is the same as the
+    stacking order of each foot's ancestor that is an immediate child
+    of the two feet's common ancestor (i.e., the torso item); so the
+    feet are stacked in the same order as the upper-leg items,
+    regardless of each foot's Z-value.
+
+    The Z-value does not affect the item's size in any way.
+
+    The default Z-value is 0.
+
+    \sa zValue()
+*/
+void QGraphicsItem::setZValue(qreal z)
+{
+    qreal newZ = qreal(itemChange(ItemZValueChange, double(z)).toDouble());
+    if (newZ == d_ptr->z)
+        return;
+    d_ptr->z = z;
+    d_ptr->fullUpdateHelper();
+
+    if (d_ptr->scene) {
+        // Invalidate any sort caching; arrival of a new item means we need to
+        // resort.
+        d_ptr->scene->d_func()->invalidateSortCache();
+    }
+
+    itemChange(ItemZValueHasChanged, double(newZ));
+}
+
+/*!
+    Returns the bounding rect of this item's descendants (i.e., its
+    children, their children, etc.) in local coordinates. The
+    rectangle will contain all descendants after they have been mapped
+    to local coordinates. If the item has no children, this function
+    returns an empty QRectF.
+
+    This does not include this item's own bounding rect; it only returns
+    its descendants' accumulated bounding rect. If you need to include this
+    item's bounding rect, you can add boundingRect() to childrenBoundingRect()
+    using QRectF::operator|().
+
+    This function is linear in complexity; it determines the size of the
+    returned bounding rect by iterating through all descendants.
+
+    \sa boundingRect(), sceneBoundingRect()
+*/
+QRectF QGraphicsItem::childrenBoundingRect() const
+{
+    QRectF childRect;
+    foreach (QGraphicsItem *child, children()) {
+        QPointF childPos = child->pos();
+        QTransform matrix = child->transform() * QTransform::fromTranslate(childPos.x(), childPos.y());
+        childRect |= matrix.mapRect(child->boundingRect() | child->childrenBoundingRect());
+    }
+    return childRect;
+}
+
+/*!
+    \fn virtual QRectF QGraphicsItem::boundingRect() const = 0
+
+    This pure virtual function defines the outer bounds of the item as
+    a rectangle; all painting must be restricted to inside an item's
+    bounding rect. QGraphicsView uses this to determine whether the
+    item requires redrawing.
+
+    Although the item's shape can be arbitrary, the bounding rect is
+    always rectangular, and it is unaffected by the items'
+    transformation (scale(), rotate(), etc.).
+
+    If you want to change the item's bounding rectangle, you must first call
+    prepareGeometryChange(). This notifies the scene of the imminent change,
+    so that its can update its item geometry index; otherwise, the scene will
+    be unaware of the item's new geometry, and the results are undefined
+    (typically, rendering artifacts are left around in the view).
+
+    Reimplement this function to let QGraphicsView determine what
+    parts of the widget, if any, need to be redrawn.
+
+    Note: For shapes that paint an outline / stroke, it is important
+    to include half the pen width in the bounding rect. It is not
+    necessary to compensate for antialiasing, though.
+
+    Example:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsitem.cpp 8
+
+    \sa boundingRegion(), shape(), contains(), {The Graphics View Coordinate
+    System}, prepareGeometryChange()
+*/
+
+/*!
+    Returns the bounding rect of this item in scene coordinates, by combining
+    sceneTransform() with boundingRect().
+
+    \sa boundingRect(), {The Graphics View Coordinate System}
+*/
+QRectF QGraphicsItem::sceneBoundingRect() const
+{
+    // Find translate-only offset
+    QPointF offset;
+    const QGraphicsItem *parentItem = this;
+    const QGraphicsItemPrivate *itemd;
+    do {
+        itemd = parentItem->d_ptr;
+        if (itemd->hasTransform)
+            break;
+        offset += itemd->pos;
+    } while ((parentItem = itemd->parent));
+
+    QRectF br = boundingRect();
+    br.translate(offset);
+    return !parentItem ? br : parentItem->sceneTransform().mapRect(br);
+}
+
+/*!
+    Returns the shape of this item as a QPainterPath in local
+    coordinates. The shape is used for many things, including collision
+    detection, hit tests, and for the QGraphicsScene::items() functions.
+
+    The default implementation calls boundingRect() to return a simple
+    rectangular shape, but subclasses can reimplement this function to return
+    a more accurate shape for non-rectangular items. For example, a round item
+    may choose to return an elliptic shape for better collision detection. For
+    example:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsitem.cpp 9
+
+    The outline of a shape can vary depending on the width and style of the
+    pen used when drawing. If you want to include this outline in the item's
+    shape, you can create a shape from the stroke using QPainterPathStroker.
+
+    This function is called by the default implementations of contains() and
+    collidesWithPath().
+
+    \sa boundingRect(), contains(), prepareGeometryChange(), QPainterPathStroker
+*/
+QPainterPath QGraphicsItem::shape() const
+{
+    QPainterPath path;
+    path.addRect(boundingRect());
+    return path;
+}
+
+/*!
+    Returns true if this item is clipped. An item is clipped if it has either
+    set the \l ItemClipsToShape flag, or if it or any of its ancestors has set
+    the \l ItemClipsChildrenToShape flag.
+
+    Clipping affects the item's appearance (i.e., painting), as well as mouse
+    and hover event delivery.
+
+    \sa clipPath(), shape(), setFlags()
+*/
+bool QGraphicsItem::isClipped() const
+{
+    Q_D(const QGraphicsItem);
+    return (d->ancestorFlags & QGraphicsItemPrivate::AncestorClipsChildren)
+        || (d->flags & QGraphicsItem::ItemClipsToShape);
+}
+
+/*!
+    \since 4.5
+
+    Returns this item's clip path, or an empty QPainterPath if this item is
+    not clipped. The clip path constrains the item's appearance and
+    interaction (i.e., restricts the area the item can draw, and it also
+    restricts the area that the item receives events).
+
+    You can enable clipping by setting the ItemClipsToShape or
+    ItemClipsChildrenToShape flags. The item's clip path is calculated by
+    intersecting all clipping ancestors' shapes. If the item sets
+    ItemClipsToShape, the final clip is intersected with the item's own shape.
+
+    \note Clipping introduces a performance penalty for all items involved;
+    you should generally avoid using clipping if you can (e.g., if your items
+    always draw inside boundingRect() or shape() boundaries, clipping is not
+    necessary).
+
+    \sa isClipped(), shape(), setFlags()
+*/
+QPainterPath QGraphicsItem::clipPath() const
+{
+    Q_D(const QGraphicsItem);
+    QPainterPath clip;
+    if (!isClipped())
+        return clip;
+
+    // Start with the item's bounding rect.
+    clip.addRect(boundingRect());
+
+    bool clipAway = false;
+    if (d->ancestorFlags & QGraphicsItemPrivate::AncestorClipsChildren) {
+        // Make list of parents up to the farthest ancestor that clips its
+        // children to its shape.
+        QVarLengthArray<const QGraphicsItem *, 32> clippingAncestors;
+        const QGraphicsItem *parent = parentItem();
+        const QGraphicsItem *clipOwner = 0;
+        do {
+            if (parent->d_ptr->flags & ItemClipsChildrenToShape) {
+                clippingAncestors.append(parent);
+                clipOwner = parent;
+            }
+        } while ((parent->d_ptr->ancestorFlags & QGraphicsItemPrivate::AncestorClipsChildren) && (parent = parent->parentItem()));
+
+        // Start with the topmost clip.
+        QPainterPath parentClip = clipOwner->shape();
+
+        // Intersect any in-between clips starting at the bottom and moving
+        // upwards.
+        for (int i = clippingAncestors.size() - 2; i >= 0; --i) {
+            const QGraphicsItem *item = clippingAncestors[i];
+            // ### what if itemtransform fails
+            if (clipOwner)
+                parentClip = clipOwner->itemTransform(item).map(parentClip);
+            parentClip = parentClip.intersected(item->shape());
+            if (parentClip.isEmpty()) {
+                clip = parentClip;
+                clipAway = true;
+                break;
+            }
+            clipOwner = item;
+        }
+
+        if (!clipAway) {
+            // ### what if itemtransform fails
+            clip = clip.intersected(clipOwner->itemTransform(this).map(parentClip));
+            if (clip.isEmpty())
+                clipAway = true;
+        }
+    }
+
+    if (!clipAway && d->flags & ItemClipsToShape)
+        clip = clip.intersected(shape());
+
+    return clip;
+}
+
+/*!
+    Returns true if this item contains \a point, which is in local
+    coordinates; otherwise, false is returned. It is most often called from
+    QGraphicsView to determine what item is under the cursor, and for that
+    reason, the implementation of this function should be as light-weight as
+    possible.
+
+    By default, this function calls shape(), but you can reimplement it in a
+    subclass to provide a (perhaps more efficient) implementation.
+
+    \sa shape(), boundingRect(), collidesWithPath()
+*/
+bool QGraphicsItem::contains(const QPointF &point) const
+{
+    return isClipped() ? clipPath().contains(point) : shape().contains(point);
+}
+
+/*!
+    Returns true if this item collides with \a other; otherwise returns false.
+    The ways items collide is determined by \a mode. The default value for \a
+    mode is Qt::IntersectsItemShape; \a other collides with this item if it
+    either intersects, contains, or is contained by this item's shape.
+
+    The default implementation is based on shape intersection, and it calls
+    shape() on both items. Because the complexity of arbitrary shape-shape
+    intersection grows with an order of magnitude when the shapes are complex,
+    this operation can be noticably time consuming. You have the option of
+    reimplementing this function in a subclass of QGraphicsItem to provide a
+    custom algorithm. This allows you to make use of natural constraints in
+    the shapes of your own items, in order to improve the performance of the
+    collision detection. For instance, two untransformed perfectly circular
+    items' collision can be determined very efficiently by comparing their
+    positions and radii.
+
+    Keep in mind that when reimplementing this function and calling shape() or
+    boundingRect() on \a other, the returned coordinates must be mapped to
+    this item's coordinate system before any intersection can take place.
+
+    \sa contains(), shape()
+*/
+bool QGraphicsItem::collidesWithItem(const QGraphicsItem *other, Qt::ItemSelectionMode mode) const
+{
+    if (other == this)
+        return true;
+    if (!other)
+        return false;
+    // The items share the same clip if their closest clipper is the same, or
+    // if one clips the other.
+    bool clips = (d_ptr->ancestorFlags & QGraphicsItemPrivate::AncestorClipsChildren);
+    bool otherClips = (other->d_ptr->ancestorFlags & QGraphicsItemPrivate::AncestorClipsChildren);
+    if (clips || otherClips) {
+        const QGraphicsItem *closestClipper = isAncestorOf(other) ? this : parentItem();
+        while (closestClipper && !(closestClipper->flags() & ItemClipsChildrenToShape))
+            closestClipper = closestClipper->parentItem();
+        const QGraphicsItem *otherClosestClipper = other->isAncestorOf(this) ? other : other->parentItem();
+        while (otherClosestClipper && !(otherClosestClipper->flags() & ItemClipsChildrenToShape))
+            otherClosestClipper = otherClosestClipper->parentItem();
+        if (closestClipper == otherClosestClipper) {
+            d_ptr->localCollisionHack = 1;
+            bool res = collidesWithPath(mapFromItem(other, other->shape()), mode);
+            d_ptr->localCollisionHack = 0;
+            return res;
+        }
+    }
+
+    QPainterPath otherShape = other->isClipped() ? other->clipPath() : other->shape();
+    return collidesWithPath(mapFromItem(other, otherShape), mode);
+}
+
+/*!
+    Returns true if this item collides with \a path.
+
+    The collision is determined by \a mode. The default value for \a mode is
+    Qt::IntersectsItemShape; \a path collides with this item if it either
+    intersects, contains, or is contained by this item's shape.
+
+    \sa collidesWithItem(), contains(), shape()
+*/
+bool QGraphicsItem::collidesWithPath(const QPainterPath &path, Qt::ItemSelectionMode mode) const
+{
+    if (path.isEmpty()) {
+        // No collision with empty paths.
+        return false;
+    }
+
+    QRectF rectA = _q_adjustedRect(boundingRect());
+    QRectF rectB = _q_adjustedRect(path.controlPointRect());
+    if (!rectA.intersects(rectB)) {
+        // This we can determine efficiently. If the two rects neither
+        // intersect nor contain eachother, then the two items do not collide.
+        return false;
+    }
+
+    // For further testing, we need this item's shape or bounding rect.
+    QPainterPath thisShape;
+    if (mode == Qt::IntersectsItemShape || mode == Qt::ContainsItemShape) {
+        thisShape = (isClipped() && !d_ptr->localCollisionHack) ? clipPath() : shape();
+    } else {
+        thisShape.addPolygon(_q_adjustedRect(boundingRect()));
+        thisShape.closeSubpath();
+    }
+    if (thisShape == QPainterPath()) {
+        // Empty shape? No collision.
+        return false;
+    }
+
+    // Use QPainterPath boolean operations to determine the collision, O(N*logN).
+    if (mode == Qt::IntersectsItemShape || mode == Qt::IntersectsItemBoundingRect)
+        return path.intersects(thisShape);
+    return path.contains(thisShape);
+}
+
+/*!
+    Returns a list of all items that collide with this item.
+
+    The way collisions are detected is determined by \a mode. The default
+    value for \a mode is Qt::IntersectsItemShape; All items whose shape
+    intersects or is contained by this item's shape are returned.
+
+    \sa QGraphicsScene::collidingItems(), collidesWithItem()
+*/
+QList<QGraphicsItem *> QGraphicsItem::collidingItems(Qt::ItemSelectionMode mode) const
+{
+    if (d_ptr->scene)
+        return d_ptr->scene->collidingItems(this, mode);
+    return QList<QGraphicsItem *>();
+}
+
+/*!
+    Returns true if this item's bounding rect is completely obscured by the
+    opaque shape of any of colliding items above it (i.e., with a higher Z
+    value than this item).
+
+    Its implementation is based on calling isObscuredBy(), which you can
+    reimplement to provide a custom obscurity algorithm.
+
+  \sa opaqueArea()
+*/
+bool QGraphicsItem::isObscured() const
+{
+    return isObscured(QRectF());
+}
+
+/*!
+    \internal
+
+    Item obscurity helper function.
+
+    Returns true if the subrect \a rect of \a item's bounding rect is obscured
+    by \a other (i.e., \a other's opaque area covers \a item's \a rect
+    completely. \a other is assumed to already be "on top of" \a item
+    wrt. stacking order.
+*/
+static bool qt_QGraphicsItem_isObscured(const QGraphicsItem *item,
+                                        const QGraphicsItem *other,
+                                        const QRectF &rect)
+{
+    return other->mapToItem(item, other->opaqueArea()).contains(rect);
+}
+
+/*!
+    \overload
+    \since 4.3
+
+    Returns true if \a rect is completely obscured by the opaque shape of any
+    of colliding items above it (i.e., with a higher Z value than this item).
+
+    Unlike the default isObscured() function, this function does not call
+    isObscuredBy().
+
+    \sa opaqueArea()
+*/
+bool QGraphicsItem::isObscured(const QRectF &rect) const
+{
+    Q_D(const QGraphicsItem);
+    if (!d->scene)
+        return false;
+
+    QRectF br = boundingRect();
+    QRectF testRect = rect.isNull() ? br : rect;
+
+    foreach (QGraphicsItem *item, d->scene->items(mapToScene(br), Qt::IntersectsItemBoundingRect)) {
+        if (item == this)
+            break;
+        if (qt_QGraphicsItem_isObscured(this, item, testRect))
+            return true;
+    }
+    return false;
+}
+
+/*!
+    \fn bool QGraphicsItem::isObscured(qreal x, qreal y, qreal w, qreal h) const
+    \since 4.3
+
+    This convenience function is equivalent to calling isObscured(QRectF(\a x, \a y, \a w, \a h)).
+*/
+
+/*!
+    Returns true if this item's bounding rect is completely obscured by the
+    opaque shape of \a item.
+
+    The base implementation maps \a item's opaqueArea() to this item's
+    coordinate system, and then checks if this item's boundingRect() is fully
+    contained within the mapped shape.
+
+    You can reimplement this function to provide a custom algorithm for
+    determining whether this item is obscured by \a item.
+
+    \sa opaqueArea(), isObscured()
+*/
+bool QGraphicsItem::isObscuredBy(const QGraphicsItem *item) const
+{
+    if (!item)
+        return false;
+    return QGraphicsScenePrivate::closestItemFirst_withoutCache(item, this)
+        && qt_QGraphicsItem_isObscured(this, item, boundingRect());
+}
+
+/*!
+    This virtual function returns a shape representing the area where this
+    item is opaque. An area is opaque if it is filled using an opaque brush or
+    color (i.e., not transparent).
+
+    This function is used by isObscuredBy(), which is called by underlying
+    items to determine if they are obscured by this item.
+
+    The default implementation returns an empty QPainterPath, indicating that
+    this item is completely transparent and does not obscure any other items.
+
+    \sa isObscuredBy(), isObscured(), shape()
+*/
+QPainterPath QGraphicsItem::opaqueArea() const
+{
+    return QPainterPath();
+}
+
+/*!
+    \since 4.4
+
+    Returns the bounding region for this item. The coordinate space of the
+    returned region depends on \a itemToDeviceTransform. If you pass an
+    identity QTransform as a parameter, this function will return a local
+    coordinate region.
+
+    The bounding region describes a coarse outline of the item's visual
+    contents. Although it's expensive to calculate, it's also more precise
+    than boundingRect(), and it can help to avoid unnecessary repainting when
+    an item is updated. This is particularily efficient for thin items (e.g.,
+    lines or simple polygons). You can tune the granularity for the bounding
+    region by calling setBoundingRegionGranularity(). The default granularity
+    is 0; in which the item's bounding region is the same as its bounding
+    rect.
+
+    \a itemToDeviceTransform is the transformation from item coordinates to
+    device coordinates. If you want this function to return a QRegion in scene
+    coordinates, you can pass sceneTransform() as an argument.
+
+    \sa boundingRegionGranularity()
+*/
+QRegion QGraphicsItem::boundingRegion(const QTransform &itemToDeviceTransform) const
+{
+    // ### Ideally we would have a better way to generate this region,
+    // preferably something in the lines of QPainterPath::toRegion(QTransform)
+    // coupled with a way to generate a painter path from a set of painter
+    // operations (e.g., QPicture::toPainterPath() or so). The current
+    // approach generates a bitmap with the size of the item's bounding rect
+    // in device coordinates, scaled by b.r.granularity, then paints the item
+    // into the bitmap, converts the result to a QRegion and scales the region
+    // back to device space with inverse granularity.
+    qreal granularity = boundingRegionGranularity();
+    QRect deviceRect = _q_adjustedRect(itemToDeviceTransform.mapRect(boundingRect()).toRect());
+    if (granularity == 0.0)
+        return QRegion(deviceRect);
+
+    int pad = 1;
+    QSize bitmapSize(qMax(1, int(deviceRect.width() * granularity) + pad * 2),
+                     qMax(1, int(deviceRect.height() * granularity) + pad * 2));
+    QImage mask(bitmapSize, QImage::Format_ARGB32_Premultiplied);
+    mask.fill(0);
+    QPainter p(&mask);
+    p.setRenderHints(QPainter::Antialiasing);
+
+    // Transform painter (### this code is from QGraphicsScene::drawItemHelper
+    // and doesn't work properly with perspective transformations).
+    QPointF viewOrigo = itemToDeviceTransform.map(QPointF(0,  0));
+    QPointF offset = viewOrigo - deviceRect.topLeft();
+    p.scale(granularity, granularity);
+    p.translate(offset);
+    p.translate(pad, pad);
+    p.setWorldTransform(itemToDeviceTransform, true);
+    p.translate(itemToDeviceTransform.inverted().map(QPointF(0, 0)));
+
+    // Render
+    QStyleOptionGraphicsItem option;
+    const_cast<QGraphicsItem *>(this)->paint(&p, &option, 0);
+    p.end();
+
+    // Transform QRegion back to device space
+    QTransform unscale;
+    unscale.scale(1 / granularity, 1 / granularity);
+    QRegion r;
+    QBitmap colorMask = QBitmap::fromImage(mask.createMaskFromColor(0));
+    foreach (const QRect &rect, QRegion( colorMask ).rects()) {
+        QRect xrect = unscale.mapRect(rect).translated(deviceRect.topLeft() - QPoint(pad, pad));
+        r += xrect.adjusted(-1, -1, 1, 1) & deviceRect;
+    }
+    return r;
+}
+
+/*!
+    \since 4.4
+
+    Returns the item's bounding region granularity; a value between and
+    including 0 and 1. The default value is 0 (i.e., the lowest granularity,
+    where the bounding region corresponds to the item's bounding rectangle).
+
+\omit
+### NOTE
+\endomit
+
+    \sa setBoundingRegionGranularity()
+*/
+qreal QGraphicsItem::boundingRegionGranularity() const
+{
+    return d_ptr->hasBoundingRegionGranularity
+        ? qVariantValue<qreal>(d_ptr->extra(QGraphicsItemPrivate::ExtraBoundingRegionGranularity))
+        : 0;
+}
+
+/*!
+    \since 4.4
+    Sets the bounding region granularity to \a granularity; a value between
+    and including 0 and 1. The default value is 0 (i.e., the lowest
+    granularity, where the bounding region corresponds to the item's bounding
+    rectangle).
+
+    The granularity is used by boundingRegion() to calculate how fine the
+    bounding region of the item should be. The highest achievable granularity
+    is 1, where boundingRegion() will return the finest outline possible for
+    the respective device (e.g., for a QGraphicsView viewport, this gives you
+    a pixel-perfect bounding region). The lowest possible granularity is
+    0. The value of \a granularity describes the ratio between device
+    resolution and the resolution of the bounding region (e.g., a value of
+    0.25 will provide a region where each chunk corresponds to 4x4 device
+    units / pixels).
+
+    \sa boundingRegionGranularity()
+*/
+void QGraphicsItem::setBoundingRegionGranularity(qreal granularity)
+{
+    if (granularity < 0.0 || granularity > 1.0) {
+        qWarning("QGraphicsItem::setBoundingRegionGranularity: invalid granularity %g", granularity);
+        return;
+    }
+    if (granularity == 0.0) {
+        d_ptr->unsetExtra(QGraphicsItemPrivate::ExtraBoundingRegionGranularity);
+        d_ptr->hasBoundingRegionGranularity = 0;
+        return;
+    }
+    d_ptr->hasBoundingRegionGranularity = 1;
+    d_ptr->setExtra(QGraphicsItemPrivate::ExtraBoundingRegionGranularity,
+                    qVariantFromValue<qreal>(granularity));
+}
+
+/*!
+    \fn virtual void QGraphicsItem::paint(QPainter *painter, const
+    QStyleOptionGraphicsItem *option, QWidget *widget = 0) = 0
+
+    This function, which is usually called by QGraphicsView, paints the
+    contents of an item in local coordinates.
+
+    Reimplement this function in a QGraphicsItem subclass to provide the
+    item's painting implementation, using \a painter. The \a option parameter
+    provides style options for the item, such as its state, exposed area and
+    its level-of-detail hints. The \a widget argument is optional. If
+    provided, it points to the widget that is being painted on; otherwise, it
+    is 0. For cached painting, \a widget is always 0.
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsitem.cpp 10
+
+    The painter's pen is 0-width by default, and its pen is initialized to the
+    QPalette::Text brush from the paint device's palette. The brush is
+    initialized to QPalette::Window.
+
+    Make sure to constrain all painting inside the boundaries of
+    boundingRect() to avoid rendering artifacts (as QGraphicsView does not
+    clip the painter for you). In particular, when QPainter renders the
+    outline of a shape using an assigned QPen, half of the outline will be
+    drawn outside, and half inside, the shape you're rendering (e.g., with a
+    pen width of 2 units, you must draw outlines 1 unit inside
+    boundingRect()). QGraphicsItem does not support use of cosmetic pens with
+    a non-zero width.
+
+    All painting is done in local coordinates.
+
+    \sa setCacheMode(), QPen::width(), {Item Coordinates}
+*/
+
+/*!
+    \internal
+
+    Asks the scene to mark this item's scene rect as dirty, requesting a
+    redraw.  This does not invalidate any cache.
+
+    The \a force argument is for the update call in setVisible(), which is the
+    only case where the item's background should be marked as dirty even when
+    the item isn't visible.
+*/
+void QGraphicsItemPrivate::updateHelper(const QRectF &rect, bool force)
+{
+    // No scene, or if the scene is updating everything, means we have nothing
+    // to do. The only exception is if the scene tracks the growing scene rect.
+    if (dirty)
+        return;
+    if (!scene || (scene && scene->d_func()->updateAll && scene->d_func()->hasSceneRect))
+        return;
+    if (scene && (visible || force)) {
+        if (rect.isNull())
+            dirty = 1;
+        scene->itemUpdated(q_ptr, rect);
+    }
+}
+
+/*!
+    \internal
+
+    Propagates updates to \a item and all its children.
+*/
+void QGraphicsItemPrivate::fullUpdateHelper(bool childrenOnly)
+{
+    // No scene, or if the scene is updating everything, means we have nothing
+    // to do. The only exception is if the scene tracks the growing scene rect.
+    if (!scene || (scene && scene->d_func()->updateAll && scene->d_func()->hasSceneRect))
+        return;
+    if (!childrenOnly && !dirty)
+        updateHelper();
+    if (children.isEmpty() || dirtyChildren)
+        return;
+    if (flags & QGraphicsItem::ItemClipsChildrenToShape) {
+        // ### mark all children dirty?
+        // Unnecessary to update children as well.
+        return;
+    }
+    if (ancestorFlags & AncestorClipsChildren) {
+        Q_Q(QGraphicsItem);
+        // Check if we can avoid updating all children.
+        QGraphicsItem *p = parent;
+        QRectF br = q->boundingRect();
+        while (p) {
+            if (p->d_ptr->flags & QGraphicsItem::ItemClipsChildrenToShape) {
+                bool ok;
+                QTransform x = q->itemTransform(p, &ok);
+                if (!ok)
+                    break;
+                if (x.mapRect(br).contains(p->boundingRect()))
+                    return;
+            }
+            p = p->d_ptr->parent;
+            if (!p || !(p->d_ptr->ancestorFlags & AncestorClipsChildren))
+                break;
+            // ### check one level only
+            break;
+        }
+    }
+    foreach (QGraphicsItem *child, children)
+        child->d_ptr->fullUpdateHelper();
+    dirtyChildren = 1;
+}
+
+/*!
+    \internal
+
+    Resolves and propagates this item's effective opacity to its children.
+*/
+void QGraphicsItemPrivate::resolveEffectiveOpacity(qreal parentEffectiveOpacity)
+{
+    Q_Q(QGraphicsItem);
+    QGraphicsItem::GraphicsItemFlags myFlags = q->flags();
+    QGraphicsItem::GraphicsItemFlags parentFlags = parent ? parent->flags() : QGraphicsItem::GraphicsItemFlags(0);
+
+    // My local opacity is always part of my effective opacity.
+    qreal myEffectiveOpacity = q->opacity();
+
+    // If I have a parent, and I don't ignore my parent's opacity, and my
+    // parent propagates to me, then combine my local opacity with my parent's
+    // effective opacity into my effective opacity.
+    if (parent
+        && !(myFlags & QGraphicsItem::ItemIgnoresParentOpacity)
+        && !(parentFlags & QGraphicsItem::ItemDoesntPropagateOpacityToChildren)) {
+        myEffectiveOpacity *= parentEffectiveOpacity;
+    }
+
+    // Set this item's resolved opacity.
+    setExtra(ExtraEffectiveOpacity, myEffectiveOpacity);
+
+    // Resolve children always.
+    for (int i = 0; i < children.size(); ++i)
+        children.at(i)->d_ptr->resolveEffectiveOpacity(myEffectiveOpacity);
+}
+
+/*!
+    \internal
+
+    Resolves the stacking depth of this object and all its children.
+*/
+void QGraphicsItemPrivate::resolveDepth(int parentDepth)
+{
+    depth = parentDepth + 1;
+    for (int i = 0; i < children.size(); ++i)
+        children.at(i)->d_ptr->resolveDepth(depth);
+}
+
+/*!
+    \internal
+*/
+void QGraphicsItemPrivate::invalidateSceneTransformCache()
+{
+    if (!scene || (parent && sceneTransformIndex == -1))
+        return;
+    if (sceneTransformIndex != -1)
+        scene->d_func()->validTransforms.setBit(sceneTransformIndex, 0);
+    for (int i = 0; i < children.size(); ++i)
+        children.at(i)->d_ptr->invalidateSceneTransformCache();
+}
+
+QGraphicsItemCache *QGraphicsItemPrivate::extraItemCache() const
+{
+    QGraphicsItemCache *c = (QGraphicsItemCache *)qVariantValue<void *>(extra(ExtraCacheData));
+    if (!c) {
+        QGraphicsItemPrivate *that = const_cast<QGraphicsItemPrivate *>(this);
+        c = new QGraphicsItemCache;
+        that->setExtra(ExtraCacheData, qVariantFromValue<void *>(c));
+    }
+    return c;
+}
+
+void QGraphicsItemPrivate::removeExtraItemCache()
+{
+    QGraphicsItemCache *c = (QGraphicsItemCache *)qVariantValue<void *>(extra(ExtraCacheData));
+    if (c) {
+        c->purge();
+        delete c;
+    }
+    unsetExtra(ExtraCacheData);
+}
+
+/*!
+    \internal
+
+    Tells us if it is a proxy widget
+*/
+bool QGraphicsItemPrivate::isProxyWidget() const
+{
+    return false;
+}
+
+/*!
+    Schedules a redraw of the area covered by \a rect in this item. You can
+    call this function whenever your item needs to be redrawn, such as if it
+    changes appearance or size.
+
+    This function does not cause an immediate paint; instead it schedules a
+    paint request that is processed by QGraphicsView after control reaches the
+    event loop. The item will only be redrawn if it is visible in any
+    associated view.
+
+    As a side effect of the item being repainted, other items that overlap the
+    area \a rect may also be repainted.
+
+    If the item is invisible (i.e., isVisible() returns false), this function
+    does nothing.
+
+    \sa paint(), boundingRect()
+*/
+void QGraphicsItem::update(const QRectF &rect)
+{
+    if (d_ptr->dirty)
+        return;
+    if (d_ptr->scene && isVisible()) {
+        if (CacheMode(d_ptr->cacheMode) != NoCache) {
+            QGraphicsItemCache *cache = d_ptr->extraItemCache();
+            if (rect.isNull()) {
+                cache->allExposed = true;
+                cache->exposed.clear();
+            } else {
+                cache->exposed.append(rect);
+            }
+        }
+        d_ptr->updateHelper(rect);
+    }
+}
+
+
+/*!
+    \since 4.4
+    Scrolls the contents of \a rect by \a dx, \a dy. If \a rect is a null rect
+    (the default), the item's bounding rect is scrolled.
+
+    Scrolling provides a fast alternative to simply redrawing when the
+    contents of the item (or parts of the item) are shifted vertically or
+    horizontally. Depending on the current transformation and the capabilities
+    of the paint device (i.e., the viewport), this operation may consist of
+    simply moving pixels from one location to another using memmove(). In most
+    cases this is faster than rerendering the entire area.
+
+    After scrolling, the item will issue an update for the newly exposed
+    areas. If scrolling is not supported (e.g., you are rendering to an OpenGL
+    viewport, which does not benefit from scroll optimizations), this function
+    is equivalent to calling update(\a rect).
+
+    \sa boundingRect()
+*/
+void QGraphicsItem::scroll(qreal dx, qreal dy, const QRectF &rect)
+{
+    Q_D(QGraphicsItem);
+    if (dx == 0.0 && dy == 0.0)
+        return;
+    if (!d->scene)
+        return;
+    if (d->cacheMode != NoCache) {
+        // ### This is very slow, and can be done much better. If the cache is
+        // local and matches the below criteria for rotation and scaling, we
+        // can easily scroll. And if the cache is in device coordinates, we
+        // can scroll both the viewport and the cache.
+        update(rect);
+        return;
+    }
+
+    QRectF scrollRect = !rect.isNull() ? rect : boundingRect();
+    int couldntScroll = d->scene->views().size();
+    foreach (QGraphicsView *view, d->scene->views()) {
+        if (view->viewport()->inherits("QGLWidget")) {
+            // ### Please replace with a widget attribute; any widget that
+            // doesn't support partial updates / doesn't support scrolling
+            // should be skipped in this code. Qt::WA_NoPartialUpdates or so.
+            continue;
+        }
+
+        static const QLineF up(0, 0, 0, -1);
+        static const QLineF down(0, 0, 0, 1);
+        static const QLineF left(0, 0, -1, 0);
+        static const QLineF right(0, 0, 1, 0);
+
+        QTransform deviceTr;
+        if (d->itemIsUntransformable()) {
+            deviceTr = deviceTransform(view->viewportTransform());
+        } else {
+            deviceTr = sceneTransform() * view->viewportTransform();
+        }
+
+        QRect deviceScrollRect = deviceTr.mapRect(scrollRect).toRect();
+        QLineF v1 = deviceTr.map(right);
+        QLineF v2 = deviceTr.map(down);
+        QLineF u1 = v1.unitVector(); u1.translate(-v1.p1());
+        QLineF u2 = v2.unitVector(); u2.translate(-v2.p1());
+        bool noScroll = false;
+
+        // Check if the delta resolves to ints in device space.
+        QPointF deviceDelta = deviceTr.map(QPointF(dx, dy));
+        if ((deviceDelta.x() - int(deviceDelta.x()))
+            || (deviceDelta.y() - int(deviceDelta.y()))) {
+            noScroll = true;
+        } else {
+            // Check if the unit vectors have no fraction in device space.
+            qreal v1l = v1.length();
+            if (v1l - int(v1l)) {
+                noScroll = true;
+            } else {
+                dx *= v1.length();
+            }
+            qreal v2l = v2.length();
+            if (v2l - int(v2l)) {
+                noScroll = true;
+            } else {
+                dy *= v2.length();
+            }
+        }
+
+        if (!noScroll) {
+            if (u1 == right) {
+                if (u2 == up) {
+                    // flipped
+                    dy = -dy;
+                } else if (u2 == down) {
+                    // normal
+                } else {
+                    noScroll = true;
+                }
+            } else if (u1 == left) {
+                if (u2 == up) {
+                    // mirrored & flipped / rotated 180 degrees
+                    dx = -dx;
+                    dy = -dy;
+                } else if (u2 == down) {
+                    // mirrored
+                    dx = -dx;
+                } else {
+                    noScroll = true;
+                }
+            } else if (u1 == up) {
+                if (u2 == left) {
+                    // rotated -90 & mirrored
+                    qreal tmp = dy;
+                    dy = -dx;
+                    dx = -tmp;
+                } else if (u2 == right) {
+                    // rotated -90
+                    qreal tmp = dy;
+                    dy = -dx;
+                    dx = tmp;
+                } else {
+                    noScroll = true;
+                }
+            } else if (u1 == down) {
+                if (u2 == left) {
+                    // rotated 90
+                    qreal tmp = dy;
+                    dy = dx;
+                    dx = -tmp;
+                } else if (u2 == right) {
+                    // rotated 90 & mirrored
+                    qreal tmp = dy;
+                    dy = dx;
+                    dx = tmp;
+                } else {
+                    noScroll = true;
+                }
+            }
+        }
+
+        if (!noScroll) {
+            view->viewport()->scroll(int(dx), int(dy), deviceScrollRect);
+            --couldntScroll;
+        }
+    }
+    if (couldntScroll)
+        update(rect);
+}
+
+/*!
+    \fn void QGraphicsItem::update(qreal x, qreal y, qreal width, qreal height)
+    \overload
+
+    This convenience function is equivalent to calling update(QRectF(\a x, \a
+    y, \a width, \a height)).
+*/
+
+/*!
+    Maps the point \a point, which is in this item's coordinate system, to \a
+    item's coordinate system, and returns the mapped coordinate.
+
+    If \a item is 0, this function returns the same as mapToScene().
+
+    \sa itemTransform(), mapToParent(), mapToScene(), transform(), mapFromItem(), {The Graphics
+    View Coordinate System}
+*/
+QPointF QGraphicsItem::mapToItem(const QGraphicsItem *item, const QPointF &point) const
+{
+    if (item)
+        return itemTransform(item).map(point);
+    return mapToScene(point);
+}
+
+/*!
+    \fn QPointF QGraphicsItem::mapToItem(const QGraphicsItem *item, qreal x, qreal y) const
+    \overload
+
+    This convenience function is equivalent to calling mapToItem(\a item,
+    QPointF(\a x, \a y)).
+*/
+
+/*!
+    Maps the point \a point, which is in this item's coordinate system, to its
+    parent's coordinate system, and returns the mapped coordinate. If the item
+    has no parent, \a point will be mapped to the scene's coordinate system.
+
+    \sa mapToItem(), mapToScene(), transform(), mapFromParent(), {The Graphics
+    View Coordinate System}
+*/
+QPointF QGraphicsItem::mapToParent(const QPointF &point) const
+{
+    return d_ptr->pos + (d_ptr->hasTransform ? transform().map(point) : point);
+}
+
+/*!
+    \fn QPointF QGraphicsItem::mapToParent(qreal x, qreal y) const
+    \overload
+
+    This convenience function is equivalent to calling mapToParent(QPointF(\a
+    x, \a y)).
+*/
+
+/*!
+    Maps the point \a point, which is in this item's coordinate system, to the
+    scene's coordinate system, and returns the mapped coordinate.
+
+    \sa mapToItem(), mapToParent(), transform(), mapFromScene(), {The Graphics
+    View Coordinate System}
+*/
+QPointF QGraphicsItem::mapToScene(const QPointF &point) const
+{
+    return sceneTransform().map(point);
+}
+
+/*!
+    \fn QPointF QGraphicsItem::mapToScene(qreal x, qreal y) const
+    \overload
+
+    This convenience function is equivalent to calling mapToScene(QPointF(\a
+    x, \a y)).
+*/
+
+/*!
+    Maps the rectangle \a rect, which is in this item's coordinate system, to
+    \a item's coordinate system, and returns the mapped rectangle as a polygon.
+
+    If \a item is 0, this function returns the same as mapToScene().
+
+    \sa itemTransform(), mapToParent(), mapToScene(), mapFromItem(), {The
+    Graphics View Coordinate System}
+*/
+QPolygonF QGraphicsItem::mapToItem(const QGraphicsItem *item, const QRectF &rect) const
+{
+    if (item)
+        return itemTransform(item).map(rect);
+    return mapToScene(rect);
+}
+
+/*!
+    \fn QPolygonF QGraphicsItem::mapToItem(const QGraphicsItem *item, qreal x, qreal y, qreal w, qreal h) const
+    \since 4.3
+
+    This convenience function is equivalent to calling mapToItem(item, QRectF(\a x, \a y, \a w, \a h)).
+*/
+
+/*!
+    Maps the rectangle \a rect, which is in this item's coordinate system, to
+    its parent's coordinate system, and returns the mapped rectangle as a
+    polygon. If the item has no parent, \a rect will be mapped to the scene's
+    coordinate system.
+
+    \sa mapToScene(), mapToItem(), mapFromParent(), {The Graphics View
+    Coordinate System}
+*/
+QPolygonF QGraphicsItem::mapToParent(const QRectF &rect) const
+{
+    if (!d_ptr->hasTransform)
+        return QPolygonF(rect.translated(d_ptr->pos));
+    return transform().map(rect.translated(d_ptr->pos));
+}
+
+/*!
+    \fn QPolygonF QGraphicsItem::mapToParent(qreal x, qreal y, qreal w, qreal h) const
+    \since 4.3
+
+    This convenience function is equivalent to calling mapToParent(QRectF(\a x, \a y, \a w, \a h)).
+*/
+
+/*!
+    Maps the rectangle \a rect, which is in this item's coordinate system, to
+    the scene's coordinate system, and returns the mapped rectangle as a polygon.
+
+    \sa mapToParent(), mapToItem(), mapFromScene(), {The Graphics View
+    Coordinate System}
+*/
+QPolygonF QGraphicsItem::mapToScene(const QRectF &rect) const
+{
+    return sceneTransform().map(rect);
+}
+
+/*!
+    \fn QPolygonF QGraphicsItem::mapToScene(qreal x, qreal y, qreal w, qreal h) const
+    \since 4.3
+
+    This convenience function is equivalent to calling mapToScene(QRectF(\a x, \a y, \a w, \a h)).
+*/
+
+/*!
+    \since 4.5
+
+    Maps the rectangle \a rect, which is in this item's coordinate system, to
+    \a item's coordinate system, and returns the mapped rectangle as a new
+    rectangle (i.e., the bounding rectangle of the resulting polygon).
+
+    If \a item is 0, this function returns the same as mapRectToScene().
+
+    \sa itemTransform(), mapToParent(), mapToScene(), mapFromItem(), {The
+    Graphics View Coordinate System}
+*/
+QRectF QGraphicsItem::mapRectToItem(const QGraphicsItem *item, const QRectF &rect) const
+{
+    if (item)
+        return itemTransform(item).mapRect(rect);
+    return mapRectToScene(rect);
+}
+
+/*!
+    \fn QRectF QGraphicsItem::mapRectToItem(const QGraphicsItem *item, qreal x, qreal y, qreal w, qreal h) const
+    \since 4.5
+
+    This convenience function is equivalent to calling mapRectToItem(item, QRectF(\a x, \a y, \a w, \a h)).
+*/
+
+/*!
+    \since 4.5
+
+    Maps the rectangle \a rect, which is in this item's coordinate system, to
+    its parent's coordinate system, and returns the mapped rectangle as a new
+    rectangle (i.e., the bounding rectangle of the resulting polygon).
+
+    \sa itemTransform(), mapToParent(), mapToScene(), mapFromItem(), {The
+    Graphics View Coordinate System}
+*/
+QRectF QGraphicsItem::mapRectToParent(const QRectF &rect) const
+{
+    QRectF r = rect.translated(d_ptr->pos.x(), d_ptr->pos.y());
+    return !d_ptr->hasTransform ? r : transform().mapRect(r);
+}
+
+/*!
+    \fn QRectF QGraphicsItem::mapRectToParent(qreal x, qreal y, qreal w, qreal h) const
+    \since 4.5
+
+    This convenience function is equivalent to calling mapRectToParent(QRectF(\a x, \a y, \a w, \a h)).
+*/
+
+/*!
+    \since 4.5
+
+    Maps the rectangle \a rect, which is in this item's coordinate system, to
+    the scene coordinate system, and returns the mapped rectangle as a new
+    rectangle (i.e., the bounding rectangle of the resulting polygon).
+
+    \sa itemTransform(), mapToParent(), mapToScene(), mapFromItem(), {The
+    Graphics View Coordinate System}
+*/
+QRectF QGraphicsItem::mapRectToScene(const QRectF &rect) const
+{
+    return sceneTransform().mapRect(rect);
+}
+
+/*!
+    \fn QRectF QGraphicsItem::mapRectToScene(qreal x, qreal y, qreal w, qreal h) const
+    \since 4.5
+
+    This convenience function is equivalent to calling mapRectToScene(QRectF(\a x, \a y, \a w, \a h)).
+*/
+
+/*!
+    \since 4.5
+
+    Maps the rectangle \a rect, which is in \a item's coordinate system, to
+    this item's coordinate system, and returns the mapped rectangle as a new
+    rectangle (i.e., the bounding rectangle of the resulting polygon).
+
+    If \a item is 0, this function returns the same as mapRectFromScene().
+
+    \sa itemTransform(), mapToParent(), mapToScene(), mapFromItem(), {The
+    Graphics View Coordinate System}
+*/
+QRectF QGraphicsItem::mapRectFromItem(const QGraphicsItem *item, const QRectF &rect) const
+{
+    if (item)
+        return item->itemTransform(this).mapRect(rect);
+    return mapRectFromScene(rect);
+}
+
+/*!
+    \fn QRectF QGraphicsItem::mapRectFromItem(const QGraphicsItem *item, qreal x, qreal y, qreal w, qreal h) const
+    \since 4.5
+
+    This convenience function is equivalent to calling mapRectFromItem(item, QRectF(\a x, \a y, \a w, \a h)).
+*/
+
+/*!
+    \since 4.5
+
+    Maps the rectangle \a rect, which is in this item's parent's coordinate
+    system, to this item's coordinate system, and returns the mapped rectangle
+    as a new rectangle (i.e., the bounding rectangle of the resulting
+    polygon).
+
+    \sa itemTransform(), mapToParent(), mapToScene(), mapFromItem(), {The
+    Graphics View Coordinate System}
+*/
+QRectF QGraphicsItem::mapRectFromParent(const QRectF &rect) const
+{
+    QRectF r = rect.translated(-d_ptr->pos);
+    return d_ptr->hasTransform ? transform().inverted().mapRect(r) : r;
+}
+
+/*!
+    \fn QRectF QGraphicsItem::mapRectFromParent(qreal x, qreal y, qreal w, qreal h) const
+    \since 4.5
+
+    This convenience function is equivalent to calling mapRectFromParent(QRectF(\a x, \a y, \a w, \a h)).
+*/
+
+/*!
+    \since 4.5
+
+    Maps the rectangle \a rect, which is in scene coordinates, to this item's
+    coordinate system, and returns the mapped rectangle as a new rectangle
+    (i.e., the bounding rectangle of the resulting polygon).
+
+    \sa itemTransform(), mapToParent(), mapToScene(), mapFromItem(), {The
+    Graphics View Coordinate System}
+*/
+QRectF QGraphicsItem::mapRectFromScene(const QRectF &rect) const
+{
+    return sceneTransform().inverted().mapRect(rect);
+}
+
+/*!
+    \fn QRectF QGraphicsItem::mapRectFromScene(qreal x, qreal y, qreal w, qreal h) const
+    \since 4.5
+
+    This convenience function is equivalent to calling mapRectFromScene(QRectF(\a x, \a y, \a w, \a h)).
+*/
+
+/*!
+    Maps the polygon \a polygon, which is in this item's coordinate system, to
+    \a item's coordinate system, and returns the mapped polygon.
+
+    If \a item is 0, this function returns the same as mapToScene().
+
+    \sa itemTransform(), mapToParent(), mapToScene(), mapFromItem(), {The
+    Graphics View Coordinate System}
+*/
+QPolygonF QGraphicsItem::mapToItem(const QGraphicsItem *item, const QPolygonF &polygon) const
+{
+    if (item)
+        return itemTransform(item).map(polygon);
+    return mapToScene(polygon);
+}
+
+/*!
+    Maps the polygon \a polygon, which is in this item's coordinate system, to
+    its parent's coordinate system, and returns the mapped polygon. If the
+    item has no parent, \a polygon will be mapped to the scene's coordinate
+    system.
+
+    \sa mapToScene(), mapToItem(), mapFromParent(), {The Graphics View
+    Coordinate System}
+*/
+QPolygonF QGraphicsItem::mapToParent(const QPolygonF &polygon) const
+{
+    QPolygonF p = polygon;
+    p.translate(d_ptr->pos);
+    return d_ptr->hasTransform ? transform().map(p) : p;
+}
+
+/*!
+    Maps the polygon \a polygon, which is in this item's coordinate system, to
+    the scene's coordinate system, and returns the mapped polygon.
+
+    \sa mapToParent(), mapToItem(), mapFromScene(), {The Graphics View
+    Coordinate System}
+*/
+QPolygonF QGraphicsItem::mapToScene(const QPolygonF &polygon) const
+{
+    return sceneTransform().map(polygon);
+}
+
+/*!
+    Maps the path \a path, which is in this item's coordinate system, to
+    \a item's coordinate system, and returns the mapped path.
+
+    If \a item is 0, this function returns the same as mapToScene().
+
+    \sa itemTransform(), mapToParent(), mapToScene(), mapFromItem(), {The
+    Graphics View Coordinate System}
+*/
+QPainterPath QGraphicsItem::mapToItem(const QGraphicsItem *item, const QPainterPath &path) const
+{
+    if (item)
+        return itemTransform(item).map(path);
+    return mapToScene(path);
+}
+
+/*!
+    Maps the path \a path, which is in this item's coordinate system, to
+    its parent's coordinate system, and returns the mapped path. If the
+    item has no parent, \a path will be mapped to the scene's coordinate
+    system.
+
+    \sa mapToScene(), mapToItem(), mapFromParent(), {The Graphics View
+    Coordinate System}
+*/
+QPainterPath QGraphicsItem::mapToParent(const QPainterPath &path) const
+{
+    return d_ptr->parent ? itemTransform(d_ptr->parent).map(path) : mapToScene(path);
+}
+
+/*!
+    Maps the path \a path, which is in this item's coordinate system, to
+    the scene's coordinate system, and returns the mapped path.
+
+    \sa mapToParent(), mapToItem(), mapFromScene(), {The Graphics View
+    Coordinate System}
+*/
+QPainterPath QGraphicsItem::mapToScene(const QPainterPath &path) const
+{
+    return sceneTransform().map(path);
+}
+
+/*!
+    Maps the point \a point, which is in \a item's coordinate system, to this
+    item's coordinate system, and returns the mapped coordinate.
+
+    If \a item is 0, this function returns the same as mapFromScene().
+
+    \sa itemTransform(), mapFromParent(), mapFromScene(), transform(), mapToItem(), {The Graphics
+    View Coordinate System}
+*/
+QPointF QGraphicsItem::mapFromItem(const QGraphicsItem *item, const QPointF &point) const
+{
+    if (item)
+        return item->itemTransform(this).map(point);
+    return mapFromScene(point);
+}
+
+/*!
+    \fn QPointF QGraphicsItem::mapFromItem(const QGraphicsItem *item, qreal x, qreal y) const
+    \overload
+
+    This convenience function is equivalent to calling mapFromItem(\a item,
+    QPointF(\a x, \a y)).
+*/
+
+/*!
+    Maps the point \a point, which is in this item's parent's coordinate
+    system, to this item's coordinate system, and returns the mapped
+    coordinate.
+
+    \sa mapFromItem(), mapFromScene(), transform(), mapToParent(), {The Graphics
+    View Coordinate System}
+*/
+QPointF QGraphicsItem::mapFromParent(const QPointF &point) const
+{
+    if (d_ptr->hasTransform)
+        return transform().inverted().map(point - d_ptr->pos);
+    return point - d_ptr->pos;
+}
+
+/*!
+    \fn QPointF QGraphicsItem::mapFromParent(qreal x, qreal y) const
+    \overload
+
+    This convenience function is equivalent to calling
+    mapFromParent(QPointF(\a x, \a y)).
+*/
+
+/*!
+    Maps the point \a point, which is in this item's scene's coordinate
+    system, to this item's coordinate system, and returns the mapped
+    coordinate.
+
+    \sa mapFromItem(), mapFromParent(), transform(), mapToScene(), {The Graphics
+    View Coordinate System}
+*/
+QPointF QGraphicsItem::mapFromScene(const QPointF &point) const
+{
+    return sceneTransform().inverted().map(point);
+}
+
+/*!
+    \fn QPointF QGraphicsItem::mapFromScene(qreal x, qreal y) const
+    \overload
+
+    This convenience function is equivalent to calling mapFromScene(QPointF(\a
+    x, \a y)).
+*/
+
+/*!
+    Maps the rectangle \a rect, which is in \a item's coordinate system, to
+    this item's coordinate system, and returns the mapped rectangle as a
+    polygon.
+
+    If \a item is 0, this function returns the same as mapFromScene()
+
+    \sa itemTransform(), mapToItem(), mapFromParent(), transform(), {The Graphics View Coordinate
+    System}
+*/
+QPolygonF QGraphicsItem::mapFromItem(const QGraphicsItem *item, const QRectF &rect) const
+{
+    if (item)
+        return item->itemTransform(this).map(rect);
+    return mapFromScene(rect);
+}
+
+/*!
+    \fn QPolygonF QGraphicsItem::mapFromItem(const QGraphicsItem *item, qreal x, qreal y, qreal w, qreal h) const
+    \since 4.3
+
+    This convenience function is equivalent to calling mapFromItem(item, QRectF(\a x, \a y, \a w, \a h)).
+*/
+
+/*!
+    Maps the rectangle \a rect, which is in this item's parent's coordinate
+    system, to this item's coordinate system, and returns the mapped rectangle
+    as a polygon.
+
+    \sa mapToParent(), mapFromItem(), transform(), {The Graphics View Coordinate
+    System}
+*/
+QPolygonF QGraphicsItem::mapFromParent(const QRectF &rect) const
+{
+    QRectF r = rect.translated(-d_ptr->pos);
+    return d_ptr->hasTransform ? transform().inverted().map(r) : r;
+}
+
+/*!
+    \fn QPolygonF QGraphicsItem::mapFromParent(qreal x, qreal y, qreal w, qreal h) const
+    \since 4.3
+
+    This convenience function is equivalent to calling mapFromItem(QRectF(\a x, \a y, \a w, \a h)).
+*/
+
+/*!
+    Maps the rectangle \a rect, which is in this item's scene's coordinate
+    system, to this item's coordinate system, and returns the mapped rectangle
+    as a polygon.
+
+    \sa mapToScene(), mapFromItem(), transform(), {The Graphics View Coordinate
+    System}
+*/
+QPolygonF QGraphicsItem::mapFromScene(const QRectF &rect) const
+{
+    return sceneTransform().inverted().map(rect);
+}
+
+/*!
+    \fn QPolygonF QGraphicsItem::mapFromScene(qreal x, qreal y, qreal w, qreal h) const
+    \since 4.3
+
+    This convenience function is equivalent to calling mapFromScene(QRectF(\a x, \a y, \a w, \a h)).
+*/
+
+/*!
+    Maps the polygon \a polygon, which is in \a item's coordinate system, to
+    this item's coordinate system, and returns the mapped polygon.
+
+    If \a item is 0, this function returns the same as mapFromScene().
+
+    \sa itemTransform(), mapToItem(), mapFromParent(), transform(), {The
+    Graphics View Coordinate System}
+*/
+QPolygonF QGraphicsItem::mapFromItem(const QGraphicsItem *item, const QPolygonF &polygon) const
+{
+    if (item)
+        return item->itemTransform(this).map(polygon);
+    return mapFromScene(polygon);
+}
+
+/*!
+    Maps the polygon \a polygon, which is in this item's parent's coordinate
+    system, to this item's coordinate system, and returns the mapped polygon.
+
+    \sa mapToParent(), mapToItem(), transform(), {The Graphics View Coordinate
+    System}
+*/
+QPolygonF QGraphicsItem::mapFromParent(const QPolygonF &polygon) const
+{
+    QPolygonF p = polygon;
+    p.translate(-d_ptr->pos);
+    return d_ptr->hasTransform ? transform().inverted().map(p) : p;
+}
+
+/*!
+    Maps the polygon \a polygon, which is in this item's scene's coordinate
+    system, to this item's coordinate system, and returns the mapped polygon.
+
+    \sa mapToScene(), mapFromParent(), transform(), {The Graphics View Coordinate
+    System}
+*/
+QPolygonF QGraphicsItem::mapFromScene(const QPolygonF &polygon) const
+{
+    return sceneTransform().inverted().map(polygon);
+}
+
+/*!
+    Maps the path \a path, which is in \a item's coordinate system, to
+    this item's coordinate system, and returns the mapped path.
+
+    If \a item is 0, this function returns the same as mapFromScene().
+
+    \sa itemTransform(), mapFromParent(), mapFromScene(), mapToItem(), {The
+    Graphics View Coordinate System}
+*/
+QPainterPath QGraphicsItem::mapFromItem(const QGraphicsItem *item, const QPainterPath &path) const
+{
+    if (item)
+        return item->itemTransform(this).map(path);
+    return mapFromScene(path);
+}
+
+/*!
+    Maps the path \a path, which is in this item's parent's coordinate
+    system, to this item's coordinate system, and returns the mapped path.
+
+    \sa mapFromScene(), mapFromItem(), mapToParent(), {The Graphics View
+    Coordinate System}
+*/
+QPainterPath QGraphicsItem::mapFromParent(const QPainterPath &path) const
+{
+    if (d_ptr->parent)
+        return d_ptr->parent->itemTransform(this).map(path);
+    return mapFromScene(path);
+}
+
+/*!
+    Maps the path \a path, which is in this item's scene's coordinate
+    system, to this item's coordinate system, and returns the mapped path.
+
+    \sa mapFromParent(), mapFromItem(), mapToScene(), {The Graphics View
+    Coordinate System}
+*/
+QPainterPath QGraphicsItem::mapFromScene(const QPainterPath &path) const
+{
+    return sceneTransform().inverted().map(path);
+}
+
+/*!
+    Returns true if this item is an ancestor of \a child (i.e., if this item
+    is \a child's parent, or one of \a child's parent's ancestors).
+
+    \sa parentItem()
+*/
+bool QGraphicsItem::isAncestorOf(const QGraphicsItem *child) const
+{
+    if (!child || child == this)
+        return false;
+    const QGraphicsItem *ancestor = child;
+    while ((ancestor = ancestor->d_ptr->parent)) {
+        if (ancestor == this)
+            return true;
+    }
+    return false;
+}
+
+/*!
+    \since 4.4
+
+    Returns the closest common ancestor item of this item and \a other, or 0
+    if either \a other is 0, or there is no common ancestor.
+
+    \sa isAncestorOf()
+*/
+QGraphicsItem *QGraphicsItem::commonAncestorItem(const QGraphicsItem *other) const
+{
+    if (!other)
+        return 0;
+    if (other == this)
+        return const_cast<QGraphicsItem *>(this);
+    const QGraphicsItem *thisw = this;
+    const QGraphicsItem *otherw = other;
+    int thisDepth = d_ptr->depth;
+    int otherDepth = other->d_ptr->depth;
+    while (thisDepth > otherDepth) {
+        thisw = thisw->d_ptr->parent;
+        --thisDepth;
+    }
+    while (otherDepth > thisDepth) {
+        otherw = otherw->d_ptr->parent;
+        --otherDepth;
+    }
+    while (thisw && thisw != otherw) {
+        thisw = thisw->d_ptr->parent;
+        otherw = otherw->d_ptr->parent;
+    }
+    return const_cast<QGraphicsItem *>(thisw);
+}
+
+/*!
+    \since 4,4
+    Returns true if this item is currently under the mouse cursor in one of
+    the views; otherwise, false is returned.
+
+    \sa QGraphicsScene::views(), QCursor::pos()
+*/
+bool QGraphicsItem::isUnderMouse() const
+{
+    Q_D(const QGraphicsItem);
+    if (!d->scene)
+        return false;
+
+    QPoint cursorPos = QCursor::pos();
+    foreach (QGraphicsView *view, d->scene->views()) {
+        if (contains(mapFromScene(view->mapToScene(view->mapFromGlobal(cursorPos)))))
+            return true;
+    }
+    return false;
+}
+
+/*!
+    Returns this item's custom data for the key \a key as a QVariant.
+
+    Custom item data is useful for storing arbitrary properties in any
+    item. Example:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsitem.cpp 11
+
+    Qt does not use this feature for storing data; it is provided solely
+    for the convenience of the user.
+
+    \sa setData()
+*/
+QVariant QGraphicsItem::data(int key) const
+{
+    QGraphicsItemCustomDataStore *store = qt_dataStore();
+    if (!store->data.contains(this))
+        return QVariant();
+    return store->data.value(this).value(key);
+}
+
+/*!
+    Sets this item's custom data for the key \a key to \a value.
+
+    Custom item data is useful for storing arbitrary properties for any
+    item. Qt does not use this feature for storing data; it is provided solely
+    for the convenience of the user.
+
+    \sa data()
+*/
+void QGraphicsItem::setData(int key, const QVariant &value)
+{
+    qt_dataStore()->data[this][key] = value;
+}
+
+/*!
+    \fn T qgraphicsitem_cast(QGraphicsItem *item)
+    \relates QGraphicsItem
+    \since 4.2
+
+    Returns the given \a item cast to type T if \a item is of type T;
+    otherwise, 0 is returned.
+
+    \note To make this function work correctly with custom items, reimplement
+    the \l{QGraphicsItem::}{type()} function for each custom QGraphicsItem
+    subclass.
+
+    \sa QGraphicsItem::type(), QGraphicsItem::UserType
+*/
+
+/*!
+    Returns the type of an item as an int. All standard graphicsitem classes
+    are associated with a unique value; see QGraphicsItem::Type. This type
+    information is used by qgraphicsitem_cast() to distinguish between types.
+
+    The default implementation (in QGraphicsItem) returns UserType.
+
+    To enable use of qgraphicsitem_cast() with a custom item, reimplement this
+    function and declare a Type enum value equal to your custom item's type.
+    Custom items must return a value larger than or equal to UserType (65536).
+
+    For example:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsitem.cpp QGraphicsItem type
+
+    \sa UserType
+*/
+int QGraphicsItem::type() const
+{
+    return (int)UserType;
+}
+
+/*!
+    Installs an event filter for this item on \a filterItem, causing
+    all events for this item to first pass through \a filterItem's
+    sceneEventFilter() function.
+
+    To filter another item's events, install this item as an event filter
+    for the other item. Example:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsitem.cpp 12
+
+    An item can only filter events for other items in the same
+    scene. Also, an item cannot filter its own events; instead, you
+    can reimplement sceneEvent() directly.
+
+    Items must belong to a scene for scene event filters to be installed and
+    used.
+
+    \sa removeSceneEventFilter(), sceneEventFilter(), sceneEvent()
+*/
+void QGraphicsItem::installSceneEventFilter(QGraphicsItem *filterItem)
+{
+    if (!d_ptr->scene) {
+        qWarning("QGraphicsItem::installSceneEventFilter: event filters can only be installed"
+                 " on items in a scene.");
+        return;
+    }
+    if (d_ptr->scene != filterItem->scene()) {
+        qWarning("QGraphicsItem::installSceneEventFilter: event filters can only be installed"
+                 " on items in the same scene.");
+        return;
+    }
+    d_ptr->scene->d_func()->installSceneEventFilter(this, filterItem);
+}
+
+/*!
+    Removes an event filter on this item from \a filterItem.
+
+    \sa installSceneEventFilter()
+*/
+void QGraphicsItem::removeSceneEventFilter(QGraphicsItem *filterItem)
+{
+    if (!d_ptr->scene || d_ptr->scene != filterItem->scene())
+        return;
+    d_ptr->scene->d_func()->removeSceneEventFilter(this, filterItem);
+}
+
+/*!
+    Filters events for the item \a watched. \a event is the filtered
+    event.
+
+    Reimplementing this function in a subclass makes it possible
+    for the item to be used as an event filter for other items,
+    intercepting all the events send to those items before they are
+    able to respond.
+
+    Reimplementations must return true to prevent further processing of
+    a given event, ensuring that it will not be delivered to the watched
+    item, or return false to indicate that the event should be propagated
+    further by the event system.
+
+    \sa installSceneEventFilter()
+*/
+bool QGraphicsItem::sceneEventFilter(QGraphicsItem *watched, QEvent *event)
+{
+    Q_UNUSED(watched);
+    Q_UNUSED(event);
+    return false;
+}
+
+/*!
+    This virtual function receives events to this item. Reimplement
+    this function to intercept events before they are dispatched to
+    the specialized event handlers contextMenuEvent(), focusInEvent(),
+    focusOutEvent(), hoverEnterEvent(), hoverMoveEvent(),
+    hoverLeaveEvent(), keyPressEvent(), keyReleaseEvent(),
+    mousePressEvent(), mouseReleaseEvent(), mouseMoveEvent(), and
+    mouseDoubleClickEvent().
+
+    Returns true if the event was recognized and handled; otherwise, (e.g., if
+    the event type was not recognized,) false is returned.
+
+    \a event is the intercepted event.
+*/
+bool QGraphicsItem::sceneEvent(QEvent *event)
+{
+    if (d_ptr->ancestorFlags & QGraphicsItemPrivate::AncestorHandlesChildEvents) {
+        if (event->type() == QEvent::HoverEnter || event->type() == QEvent::HoverLeave
+            || event->type() == QEvent::DragEnter || event->type() == QEvent::DragLeave) {
+            // Hover enter and hover leave events for children are ignored;
+            // hover move events are forwarded.
+            return true;
+        }
+
+        QGraphicsItem *handler = this;
+        do {
+            handler = handler->d_ptr->parent;
+            Q_ASSERT(handler);
+        } while (handler->d_ptr->ancestorFlags & QGraphicsItemPrivate::AncestorHandlesChildEvents);
+        // Forward the event to the closest parent that handles child
+        // events, mapping existing item-local coordinates to its
+        // coordinate system.
+        d_ptr->remapItemPos(event, handler);
+        handler->sceneEvent(event);
+        return true;
+    }
+
+    if (!d_ptr->visible) {
+        // Eaten
+        return true;
+    }
+
+    switch (event->type()) {
+    case QEvent::FocusIn:
+        focusInEvent(static_cast<QFocusEvent *>(event));
+        break;
+    case QEvent::FocusOut:
+        focusOutEvent(static_cast<QFocusEvent *>(event));
+        break;
+    case QEvent::GraphicsSceneContextMenu:
+        contextMenuEvent(static_cast<QGraphicsSceneContextMenuEvent *>(event));
+        break;
+    case QEvent::GraphicsSceneDragEnter:
+        dragEnterEvent(static_cast<QGraphicsSceneDragDropEvent *>(event));
+        break;
+    case QEvent::GraphicsSceneDragMove:
+        dragMoveEvent(static_cast<QGraphicsSceneDragDropEvent *>(event));
+        break;
+    case QEvent::GraphicsSceneDragLeave:
+        dragLeaveEvent(static_cast<QGraphicsSceneDragDropEvent *>(event));
+        break;
+    case QEvent::GraphicsSceneDrop:
+        dropEvent(static_cast<QGraphicsSceneDragDropEvent *>(event));
+        break;
+    case QEvent::GraphicsSceneHoverEnter:
+        hoverEnterEvent(static_cast<QGraphicsSceneHoverEvent *>(event));
+        break;
+    case QEvent::GraphicsSceneHoverMove:
+        hoverMoveEvent(static_cast<QGraphicsSceneHoverEvent *>(event));
+        break;
+    case QEvent::GraphicsSceneHoverLeave:
+        hoverLeaveEvent(static_cast<QGraphicsSceneHoverEvent *>(event));
+        break;
+    case QEvent::GraphicsSceneMouseMove:
+        mouseMoveEvent(static_cast<QGraphicsSceneMouseEvent *>(event));
+        break;
+    case QEvent::GraphicsSceneMousePress:
+        mousePressEvent(static_cast<QGraphicsSceneMouseEvent *>(event));
+        break;
+    case QEvent::GraphicsSceneMouseRelease:
+        mouseReleaseEvent(static_cast<QGraphicsSceneMouseEvent *>(event));
+        break;
+    case QEvent::GraphicsSceneMouseDoubleClick:
+        mouseDoubleClickEvent(static_cast<QGraphicsSceneMouseEvent *>(event));
+        break;
+    case QEvent::GraphicsSceneWheel:
+        wheelEvent(static_cast<QGraphicsSceneWheelEvent *>(event));
+        break;
+    case QEvent::KeyPress: {
+        QKeyEvent *k = static_cast<QKeyEvent *>(event);
+        if (k->key() == Qt::Key_Tab || k->key() == Qt::Key_Backtab) {
+            if (!(k->modifiers() & (Qt::ControlModifier | Qt::AltModifier))) {  //### Add MetaModifier?
+                bool res = false;
+                if (k->key() == Qt::Key_Backtab
+                    || (k->key() == Qt::Key_Tab && (k->modifiers() & Qt::ShiftModifier))) {
+                    if (d_ptr->isWidget) {
+                        res = static_cast<QGraphicsWidget *>(this)->focusNextPrevChild(false);
+                    } else if (d_ptr->scene) {
+                        res = d_ptr->scene->focusNextPrevChild(false);
+                    }
+                } else if (k->key() == Qt::Key_Tab) {
+                    if (d_ptr->isWidget) {
+                        res = static_cast<QGraphicsWidget *>(this)->focusNextPrevChild(true);
+                    } else if (d_ptr->scene) {
+                        res = d_ptr->scene->focusNextPrevChild(true);
+                    }
+                }
+                if (!res)
+                    event->ignore();
+                return true;
+            }
+        }
+        keyPressEvent(static_cast<QKeyEvent *>(event));
+        break;
+    }
+    case QEvent::KeyRelease:
+        keyReleaseEvent(static_cast<QKeyEvent *>(event));
+        break;
+    case QEvent::InputMethod:
+        inputMethodEvent(static_cast<QInputMethodEvent *>(event));
+        break;
+    default:
+        return false;
+    }
+
+    return true;
+}
+
+/*!
+    This event handler can be reimplemented in a subclass to process context
+    menu events. The \a event parameter contains details about the event to
+    be handled.
+
+    If you ignore the event, (i.e., by calling QEvent::ignore(),) \a event
+    will propagate to any item beneath this item. If no items accept the
+    event, it will be ignored by the scene, and propagate to the view.
+
+    It's common to open a QMenu in response to receiving a context menu
+    event. Example:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsitem.cpp 13
+
+    The default implementation ignores the event.
+
+    \sa sceneEvent()
+*/
+void QGraphicsItem::contextMenuEvent(QGraphicsSceneContextMenuEvent *event)
+{
+    event->ignore();
+}
+
+/*!
+    This event handler, for event \a event, can be reimplemented to receive
+    drag enter events for this item. Drag enter events are generated as the
+    cursor enters the item's area.
+
+    By accepting the event, (i.e., by calling QEvent::accept(),) the item will
+    accept drop events, in addition to receiving drag move and drag
+    leave. Otherwise, the event will be ignored and propagate to the item
+    beneath. If the event is accepted, the item will receive a drag move event
+    before control goes back to the event loop.
+
+    A common implementation of dragEnterEvent accepts or ignores \a event
+    depending on the associated mime data in \a event. Example:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsitem.cpp 14
+
+    Items do not receive drag and drop events by default; to enable this
+    feature, call \c setAcceptDrops(true).
+
+    The default implementation does nothing.
+
+    \sa dropEvent(), dragMoveEvent(), dragLeaveEvent()
+*/
+void QGraphicsItem::dragEnterEvent(QGraphicsSceneDragDropEvent *event)
+{
+    Q_D(QGraphicsItem);
+    // binary compatibility workaround between 4.4 and 4.5
+    if (d->isProxyWidget())
+        static_cast<QGraphicsProxyWidget*>(this)->dragEnterEvent(event);
+}
+
+/*!
+    This event handler, for event \a event, can be reimplemented to receive
+    drag leave events for this item. Drag leave events are generated as the
+    cursor leaves the item's area. Most often you will not need to reimplement
+    this function, but it can be useful for resetting state in your item
+    (e.g., highlighting).
+
+    Calling QEvent::ignore() or QEvent::accept() on \a event has no effect.
+
+    Items do not receive drag and drop events by default; to enable this
+    feature, call \c setAcceptDrops(true).
+
+    The default implementation does nothing.
+
+    \sa dragEnterEvent(), dropEvent(), dragMoveEvent()
+*/
+void QGraphicsItem::dragLeaveEvent(QGraphicsSceneDragDropEvent *event)
+{
+    Q_D(QGraphicsItem);
+    // binary compatibility workaround between 4.4 and 4.5
+    if (d->isProxyWidget())
+        static_cast<QGraphicsProxyWidget*>(this)->dragLeaveEvent(event);
+}
+
+/*!
+    This event handler, for event \a event, can be reimplemented to receive
+    drag move events for this item. Drag move events are generated as the
+    cursor moves around inside the item's area. Most often you will not need
+    to reimplement this function; it is used to indicate that only parts of
+    the item can accept drops.
+
+    Calling QEvent::ignore() or QEvent::accept() on \a event toggles whether
+    or not the item will accept drops at the position from the event. By
+    default, \a event is accepted, indicating that the item allows drops at
+    the specified position.
+
+    Items do not receive drag and drop events by default; to enable this
+    feature, call \c setAcceptDrops(true).
+
+    The default implementation does nothing.
+
+    \sa dropEvent(), dragEnterEvent(), dragLeaveEvent()
+*/
+void QGraphicsItem::dragMoveEvent(QGraphicsSceneDragDropEvent *event)
+{
+    Q_D(QGraphicsItem);
+    // binary compatibility workaround between 4.4 and 4.5
+    if (d->isProxyWidget())
+        static_cast<QGraphicsProxyWidget*>(this)->dragMoveEvent(event);
+}
+
+/*!
+    This event handler, for event \a event, can be reimplemented to receive
+    drop events for this item. Items can only receive drop events if the last
+    drag move event was accepted.
+
+    Calling QEvent::ignore() or QEvent::accept() on \a event has no effect.
+
+    Items do not receive drag and drop events by default; to enable this
+    feature, call \c setAcceptDrops(true).
+
+    The default implementation does nothing.
+
+    \sa dragEnterEvent(), dragMoveEvent(), dragLeaveEvent()
+*/
+void QGraphicsItem::dropEvent(QGraphicsSceneDragDropEvent *event)
+{
+    Q_D(QGraphicsItem);
+    // binary compatibility workaround between 4.4 and 4.5
+    if (d->isProxyWidget())
+        static_cast<QGraphicsProxyWidget*>(this)->dropEvent(event);
+}
+
+/*!
+    This event handler, for event \a event, can be reimplemented to receive
+    focus in events for this item. The default implementation calls
+    ensureVisible().
+
+    \sa focusOutEvent(), sceneEvent()
+*/
+void QGraphicsItem::focusInEvent(QFocusEvent *event)
+{
+    Q_UNUSED(event);
+}
+
+/*!
+    This event handler, for event \a event, can be reimplemented to receive
+    focus out events for this item. The default implementation does nothing.
+
+    \sa focusInEvent(), sceneEvent()
+*/
+void QGraphicsItem::focusOutEvent(QFocusEvent *event)
+{
+    Q_UNUSED(event);
+}
+
+/*!
+    This event handler, for event \a event, can be reimplemented to receive
+    hover enter events for this item. The default implementation calls
+    update(); otherwise it does nothing.
+
+    Calling QEvent::ignore() or QEvent::accept() on \a event has no effect.
+
+    \sa hoverMoveEvent(), hoverLeaveEvent(), sceneEvent(), setAcceptHoverEvents()
+*/
+void QGraphicsItem::hoverEnterEvent(QGraphicsSceneHoverEvent *event)
+{
+    Q_UNUSED(event);
+    d_ptr->updateHelper();
+}
+
+/*!
+    This event handler, for event \a event, can be reimplemented to receive
+    hover move events for this item. The default implementation does nothing.
+
+    Calling QEvent::ignore() or QEvent::accept() on \a event has no effect.
+
+    \sa hoverEnterEvent(), hoverLeaveEvent(), sceneEvent(), setAcceptHoverEvents()
+*/
+void QGraphicsItem::hoverMoveEvent(QGraphicsSceneHoverEvent *event)
+{
+    Q_UNUSED(event);
+}
+
+/*!
+    This event handler, for event \a event, can be reimplemented to receive
+    hover leave events for this item. The default implementation calls
+    update(); otherwise it does nothing.
+
+    Calling QEvent::ignore() or QEvent::accept() on \a event has no effect.
+
+    \sa hoverEnterEvent(), hoverMoveEvent(), sceneEvent(), setAcceptHoverEvents()
+*/
+void QGraphicsItem::hoverLeaveEvent(QGraphicsSceneHoverEvent *event)
+{
+    Q_UNUSED(event);
+    d_ptr->updateHelper();
+}
+
+/*!
+    This event handler, for event \a event, can be reimplemented to
+    receive key press events for this item. The default implementation
+    ignores the event. If you reimplement this handler, the event will by
+    default be accepted.
+
+    Note that key events are only received for items that set the
+    ItemIsFocusable flag, and that have keyboard input focus.
+
+    \sa keyReleaseEvent(), setFocus(), QGraphicsScene::setFocusItem(),
+    sceneEvent()
+*/
+void QGraphicsItem::keyPressEvent(QKeyEvent *event)
+{
+    event->ignore();
+}
+
+/*!
+    This event handler, for event \a event, can be reimplemented to receive
+    key release events for this item. The default implementation
+    ignores the event. If you reimplement this handler, the event will by
+    default be accepted.
+
+    Note that key events are only received for items that set the
+    ItemIsFocusable flag, and that have keyboard input focus.
+
+    \sa keyPressEvent(), setFocus(), QGraphicsScene::setFocusItem(),
+    sceneEvent()
+*/
+void QGraphicsItem::keyReleaseEvent(QKeyEvent *event)
+{
+    event->ignore();
+}
+
+/*!
+    This event handler, for event \a event, can be reimplemented to
+    receive mouse press events for this item. Mouse press events are
+    only delivered to items that accept the mouse button that is
+    pressed. By default, an item accepts all mouse buttons, but you
+    can change this by calling setAcceptedMouseButtons().
+
+    The mouse press event decides which item should become the mouse
+    grabber (see QGraphicsScene::mouseGrabberItem()). If you do not
+    reimplement this function, the press event will propagate to any
+    topmost item beneath this item, and no other mouse events will be
+    delivered to this item.
+
+    If you do reimplement this function, \a event will by default be
+    accepted (see QEvent::accept()), and this item is then the mouse
+    grabber. This allows the item to receive future move, release and
+    doubleclick events. If you call QEvent::ignore() on \a event, this
+    item will lose the mouse grab, and \a event will propagate to any
+    topmost item beneath. No further mouse events will be delivered to
+    this item unless a new mouse press event is received.
+
+    The default implementation handles basic item interaction, such as
+    selection and moving. If you want to keep the base implementation
+    when reimplementing this function, call
+    QGraphicsItem::mousePressEvent() in your reimplementation.
+
+    The event is \l{QEvent::ignore()}d for items that are neither
+    \l{QGraphicsItem::ItemIsMovable}{movable} nor
+    \l{QGraphicsItem::ItemIsSelectable}{selectable}.
+
+    \sa mouseMoveEvent(), mouseReleaseEvent(),
+    mouseDoubleClickEvent(), sceneEvent()
+*/
+void QGraphicsItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
+{
+    if (event->button() == Qt::LeftButton && (flags() & ItemIsSelectable)) {
+        bool multiSelect = (event->modifiers() & Qt::ControlModifier) != 0;
+        if (!multiSelect) {
+            if (!d_ptr->selected) {
+                if (QGraphicsScene *scene = d_ptr->scene) {
+                    ++scene->d_func()->selectionChanging;
+                    scene->clearSelection();
+                    --scene->d_func()->selectionChanging;
+                }
+                setSelected(true);
+            }
+        }
+    } else if (!(flags() & ItemIsMovable)) {
+        event->ignore();
+    }
+    if (d_ptr->isWidget) {
+        // Qt::Popup closes when you click outside.
+        QGraphicsWidget *w = static_cast<QGraphicsWidget *>(this);
+        if (w->windowFlags() & Qt::Popup) {
+            event->accept();
+            if (!w->rect().contains(event->pos()))
+                w->close();
+        }
+    }
+}
+
+/*!
+    obsolete
+*/
+bool _qt_movableAncestorIsSelected(const QGraphicsItem *item)
+{
+    const QGraphicsItem *parent = item->parentItem();
+    return parent && (((parent->flags() & QGraphicsItem::ItemIsMovable) && parent->isSelected()) || _qt_movableAncestorIsSelected(parent));
+}
+
+bool QGraphicsItemPrivate::movableAncestorIsSelected(const QGraphicsItem *item)
+{
+    const QGraphicsItem *parent = item->d_ptr->parent;
+    return parent && (((parent->flags() & QGraphicsItem::ItemIsMovable) && parent->isSelected()) || _qt_movableAncestorIsSelected(parent));
+}
+
+/*!
+    This event handler, for event \a event, can be reimplemented to
+    receive mouse move events for this item. If you do receive this
+    event, you can be certain that this item also received a mouse
+    press event, and that this item is the current mouse grabber.
+
+    Calling QEvent::ignore() or QEvent::accept() on \a event has no
+    effect.
+
+    The default implementation handles basic item interaction, such as
+    selection and moving. If you want to keep the base implementation
+    when reimplementing this function, call
+    QGraphicsItem::mouseMoveEvent() in your reimplementation.
+
+    Please note that mousePressEvent() decides which graphics item it
+    is that receives mouse events. See the mousePressEvent()
+    description for details.
+
+    \sa mousePressEvent(), mouseReleaseEvent(),
+    mouseDoubleClickEvent(), sceneEvent()
+*/
+void QGraphicsItem::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
+{
+    if ((event->buttons() & Qt::LeftButton) && (flags() & ItemIsMovable)) {
+        // Determine the list of items that need to be moved.
+        QList<QGraphicsItem *> selectedItems;
+        QMap<QGraphicsItem *, QPointF> initialPositions;
+        if (d_ptr->scene) {
+            selectedItems = d_ptr->scene->selectedItems();
+            initialPositions = d_ptr->scene->d_func()->movingItemsInitialPositions;
+            if (initialPositions.isEmpty()) {
+                foreach (QGraphicsItem *item, selectedItems)
+                    initialPositions[item] = item->pos();
+                initialPositions[this] = pos();
+            }
+            d_ptr->scene->d_func()->movingItemsInitialPositions = initialPositions;
+        }
+
+        // Find the active view.
+        QGraphicsView *view = 0;
+        if (event->widget())
+            view = qobject_cast<QGraphicsView *>(event->widget()->parentWidget());
+
+        // Move all selected items
+        int i = 0;
+        bool movedMe = false;
+        while (i <= selectedItems.size()) {
+            QGraphicsItem *item = 0;
+            if (i < selectedItems.size())
+                item = selectedItems.at(i);
+            else
+                item = this;
+            if (item == this) {
+                // Slightly clumsy-looking way to ensure that "this" is part
+                // of the list of items to move, this is to avoid allocations
+                // (appending this item to the list of selected items causes a
+                // detach).
+                if (movedMe)
+                    break;
+                movedMe = true;
+            }
+
+            if ((item->flags() & ItemIsMovable) && !QGraphicsItemPrivate::movableAncestorIsSelected(item)) {
+                QPointF currentParentPos;
+                QPointF buttonDownParentPos;
+                if (item->d_ptr->ancestorFlags & QGraphicsItemPrivate::AncestorIgnoresTransformations) {
+                    // Items whose ancestors ignore transformations need to
+                    // map screen coordinates to local coordinates, then map
+                    // those to the parent.
+                    QTransform viewToItemTransform = (item->deviceTransform(view->viewportTransform())).inverted();
+                    currentParentPos = mapToParent(viewToItemTransform.map(QPointF(view->mapFromGlobal(event->screenPos()))));
+                    buttonDownParentPos = mapToParent(viewToItemTransform.map(QPointF(view->mapFromGlobal(event->buttonDownScreenPos(Qt::LeftButton)))));
+                } else if (item->flags() & ItemIgnoresTransformations) {
+                    // Root items that ignore transformations need to
+                    // calculate their diff by mapping viewport coordinates
+                    // directly to parent coordinates.
+                    QTransform viewToParentTransform = (item->transform().translate(item->d_ptr->pos.x(), item->d_ptr->pos.y()))
+                                                       * (item->sceneTransform() * view->viewportTransform()).inverted();
+                    currentParentPos = viewToParentTransform.map(QPointF(view->mapFromGlobal(event->screenPos())));
+                    buttonDownParentPos = viewToParentTransform.map(QPointF(view->mapFromGlobal(event->buttonDownScreenPos(Qt::LeftButton))));
+                } else {
+                    // All other items simply map from the scene.
+                    currentParentPos = item->mapToParent(item->mapFromScene(event->scenePos()));
+                    buttonDownParentPos = item->mapToParent(item->mapFromScene(event->buttonDownScenePos(Qt::LeftButton)));
+                }
+
+                item->setPos(initialPositions.value(item) + currentParentPos - buttonDownParentPos);
+
+                if (item->flags() & ItemIsSelectable)
+                    item->setSelected(true);
+            }
+            ++i;
+        }
+
+    } else {
+        event->ignore();
+    }
+}
+
+/*!
+    This event handler, for event \a event, can be reimplemented to
+    receive mouse release events for this item.
+
+    Calling QEvent::ignore() or QEvent::accept() on \a event has no
+    effect.
+
+    The default implementation handles basic item interaction, such as
+    selection and moving. If you want to keep the base implementation
+    when reimplementing this function, call
+    QGraphicsItem::mouseReleaseEvent() in your reimplementation.
+
+    Please note that mousePressEvent() decides which graphics item it
+    is that receives mouse events. See the mousePressEvent()
+    description for details.
+
+    \sa mousePressEvent(), mouseMoveEvent(), mouseDoubleClickEvent(),
+    sceneEvent()
+*/
+void QGraphicsItem::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
+{
+    if (flags() & ItemIsSelectable) {
+        bool multiSelect = (event->modifiers() & Qt::ControlModifier) != 0;
+        if (event->scenePos() == event->buttonDownScenePos(Qt::LeftButton)) {
+            // The item didn't move
+            if (multiSelect) {
+                setSelected(!isSelected());
+            } else {
+                bool selectionChanged = false;
+                if (QGraphicsScene *scene = d_ptr->scene) {
+                    ++scene->d_func()->selectionChanging;
+                    // Clear everything but this item. Bypass
+                    // QGraphicsScene::clearSelection()'s default behavior by
+                    // temporarily removing this item from the selection list.
+                    if (d_ptr->selected) {
+                        scene->d_func()->selectedItems.remove(this);
+                        foreach (QGraphicsItem *item, scene->d_func()->selectedItems) {
+                            if (item->isSelected()) {
+                                selectionChanged = true;
+                                break;
+                            }
+                        }
+                    }
+                    scene->clearSelection();
+                    if (d_ptr->selected)
+                        scene->d_func()->selectedItems.insert(this);
+                    --scene->d_func()->selectionChanging;
+                    if (selectionChanged)
+                        emit d_ptr->scene->selectionChanged();
+                }
+                setSelected(true);
+            }
+        }
+    }
+    if (d_ptr->scene && !event->buttons())
+        d_ptr->scene->d_func()->movingItemsInitialPositions.clear();
+}
+
+/*!
+    This event handler, for event \a event, can be reimplemented to
+    receive mouse doubleclick events for this item.
+
+    When doubleclicking an item, the item will first receive a mouse
+    press event, followed by a release event (i.e., a click), then a
+    doubleclick event, and finally a release event.
+
+    Calling QEvent::ignore() or QEvent::accept() on \a event has no
+    effect.
+
+    The default implementation calls mousePressEvent(). If you want to
+    keep the base implementation when reimplementing this function,
+    call QGraphicsItem::mouseDoubleClickEvent() in your
+    reimplementation.
+
+    Note that an item will not receive double click events if it is
+    neither \l {QGraphicsItem::ItemIsSelectable}{selectable} nor
+    \l{QGraphicsItem::ItemIsMovable}{movable} (single mouse clicks are
+    ignored in this case, and that stops the generation of double
+    clicks).
+
+    \sa mousePressEvent(), mouseMoveEvent(), mouseReleaseEvent(), sceneEvent()
+*/
+void QGraphicsItem::mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event)
+{
+    mousePressEvent(event);
+}
+
+/*!
+    This event handler, for event \a event, can be reimplemented to receive
+    wheel events for this item. If you reimplement this function, \a event
+    will be accepted by default.
+
+    If you ignore the event, (i.e., by calling QEvent::ignore(),) it will
+    propagate to any item beneath this item. If no items accept the event, it
+    will be ignored by the scene, and propagate to the view (e.g., the view's
+    vertical scroll bar).
+
+    The default implementation ignores the event.
+
+    \sa sceneEvent()
+*/
+void QGraphicsItem::wheelEvent(QGraphicsSceneWheelEvent *event)
+{
+    event->ignore();
+}
+
+/*!
+    This event handler, for event \a event, can be reimplemented to receive
+    input method events for this item. The default implementation ignores the
+    event.
+
+    \sa inputMethodQuery(), sceneEvent()
+*/
+void QGraphicsItem::inputMethodEvent(QInputMethodEvent *event)
+{
+    event->ignore();
+}
+
+/*!
+    This method is only relevant for input items. It is used by the
+    input method to query a set of properties of the item to be able
+    to support complex input method operations, such as support for
+    surrounding text and reconversions. \a query specifies which
+    property is queried.
+
+    \sa inputMethodEvent()
+*/
+QVariant QGraphicsItem::inputMethodQuery(Qt::InputMethodQuery query) const
+{
+    if (isWidget()) {
+        // ### Qt 5: Remove. The reimplementation in
+        // QGraphicsProxyWidget solves this problem (but requires a
+        // recompile to take effect).
+        return d_ptr->inputMethodQueryHelper(query);
+    }
+
+    Q_UNUSED(query);
+    return QVariant();
+}
+
+/*!
+    This virtual function is called by QGraphicsItem to notify custom items
+    that some part of the item's state changes. By reimplementing this
+    function, your can react to a change, and in some cases, (depending on \a
+    change,) adjustments can be made.
+
+    \a change is the parameter of the item that is changing. \a value is the
+    new value; the type of the value depends on \a change.
+
+    Example:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsitem.cpp 15
+
+    The default implementation does nothing, and returns \a value.
+
+    Note: Certain QGraphicsItem functions cannot be called in a
+    reimplementation of this function; see the GraphicsItemChange
+    documentation for details.
+
+    \sa GraphicsItemChange
+*/
+QVariant QGraphicsItem::itemChange(GraphicsItemChange change, const QVariant &value)
+{
+    Q_UNUSED(change);
+    return value;
+}
+
+/*!
+    \internal
+
+    Note: This is provided as a hook to avoid future problems related
+    to adding virtual functions.
+*/
+bool QGraphicsItem::supportsExtension(Extension extension) const
+{
+    Q_UNUSED(extension);
+    return false;
+}
+
+/*!
+    \internal
+
+    Note: This is provided as a hook to avoid future problems related
+    to adding virtual functions.
+*/
+void QGraphicsItem::setExtension(Extension extension, const QVariant &variant)
+{
+    Q_UNUSED(extension);
+    Q_UNUSED(variant);
+}
+
+/*!
+    \internal
+
+    Note: This is provided as a hook to avoid future problems related
+    to adding virtual functions.
+*/
+QVariant QGraphicsItem::extension(const QVariant &variant) const
+{
+    Q_UNUSED(variant);
+    return QVariant();
+}
+
+/*!
+    \internal
+
+    Adds this item to the scene's index. Called in conjunction with
+    removeFromIndex() to ensure the index bookkeeping is correct when
+    the item's position, transformation or shape changes.
+*/
+void QGraphicsItem::addToIndex()
+{
+    if (d_ptr->ancestorFlags & QGraphicsItemPrivate::AncestorClipsChildren) {
+        // ### add to child index only if applicable
+        return;
+    }
+    if (d_ptr->scene)
+        d_ptr->scene->d_func()->addToIndex(this);
+    d_ptr->updateHelper();
+}
+
+/*!
+    \internal
+
+    Removes this item from the scene's index. Called in conjunction
+    with addToIndex() to ensure the index bookkeeping is correct when
+    the item's position, transformation or shape changes.
+*/
+void QGraphicsItem::removeFromIndex()
+{
+    if (d_ptr->ancestorFlags & QGraphicsItemPrivate::AncestorClipsChildren) {
+        // ### remove from child index only if applicable
+        return;
+    }
+    d_ptr->updateHelper();
+    if (d_ptr->scene)
+        d_ptr->scene->d_func()->removeFromIndex(this);
+}
+
+/*!
+    Prepares the item for a geometry change. Call this function before
+    changing the bounding rect of an item to keep QGraphicsScene's index up to
+    date.
+
+    prepareGeometryChange() will call update() if this is necessary.
+
+    Example:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsitem.cpp 16
+
+    \sa boundingRect()
+*/
+void QGraphicsItem::prepareGeometryChange()
+{
+    if (d_ptr->scene) {
+        d_ptr->updateHelper();
+
+        QGraphicsScenePrivate *scenePrivate = d_ptr->scene->d_func();
+        scenePrivate->removeFromIndex(this);
+    }
+}
+
+/*!
+    \internal
+
+    Highlights \a item as selected.
+
+    NOTE: This function is a duplicate of qt_graphicsItem_highlightSelected() in
+          qgraphicssvgitem.cpp!
+*/
+static void qt_graphicsItem_highlightSelected(
+    QGraphicsItem *item, QPainter *painter, const QStyleOptionGraphicsItem *option)
+{
+    const QRectF murect = painter->transform().mapRect(QRectF(0, 0, 1, 1));
+    if (qFuzzyCompare(qMax(murect.width(), murect.height()) + 1, 1))
+        return;
+
+    const QRectF mbrect = painter->transform().mapRect(item->boundingRect());
+    if (qMin(mbrect.width(), mbrect.height()) < qreal(1.0))
+        return;
+
+    qreal itemPenWidth;
+    switch (item->type()) {
+        case QGraphicsEllipseItem::Type:
+            itemPenWidth = static_cast<QGraphicsEllipseItem *>(item)->pen().widthF();
+            break;
+        case QGraphicsPathItem::Type:
+            itemPenWidth = static_cast<QGraphicsPathItem *>(item)->pen().widthF();
+            break;
+        case QGraphicsPolygonItem::Type:
+            itemPenWidth = static_cast<QGraphicsPolygonItem *>(item)->pen().widthF();
+            break;
+        case QGraphicsRectItem::Type:
+            itemPenWidth = static_cast<QGraphicsRectItem *>(item)->pen().widthF();
+            break;
+        case QGraphicsSimpleTextItem::Type:
+            itemPenWidth = static_cast<QGraphicsSimpleTextItem *>(item)->pen().widthF();
+            break;
+        case QGraphicsLineItem::Type:
+            itemPenWidth = static_cast<QGraphicsLineItem *>(item)->pen().widthF();
+            break;
+        default:
+            itemPenWidth = 1.0;
+    }
+    const qreal pad = itemPenWidth / 2;
+
+    const qreal penWidth = 0; // cosmetic pen
+
+    const QColor fgcolor = option->palette.windowText().color();
+    const QColor bgcolor( // ensure good contrast against fgcolor
+        fgcolor.red()   > 127 ? 0 : 255,
+        fgcolor.green() > 127 ? 0 : 255,
+        fgcolor.blue()  > 127 ? 0 : 255);
+
+    painter->setPen(QPen(bgcolor, penWidth, Qt::SolidLine));
+    painter->setBrush(Qt::NoBrush);
+    painter->drawRect(item->boundingRect().adjusted(pad, pad, -pad, -pad));
+
+    painter->setPen(QPen(option->palette.windowText(), 0, Qt::DashLine));
+    painter->setBrush(Qt::NoBrush);
+    painter->drawRect(item->boundingRect().adjusted(pad, pad, -pad, -pad));
+}
+
+/*!
+    \class QAbstractGraphicsShapeItem
+    \brief The QAbstractGraphicsShapeItem class provides a common base for
+    all path items.
+    \since 4.2
+    \ingroup multimedia
+
+    This class does not fully implement an item by itself; in particular, it
+    does not implement boundingRect() and paint(), which are inherited by
+    QGraphicsItem.
+
+    You can subclass this item to provide a simple base implementation of
+    accessors for the item's pen and brush.
+
+    \sa QGraphicsRectItem, QGraphicsEllipseItem, QGraphicsPathItem,
+    QGraphicsPolygonItem, QGraphicsTextItem, QGraphicsLineItem,
+    QGraphicsPixmapItem, {The Graphics View Framework}
+*/
+
+class QAbstractGraphicsShapeItemPrivate : public QGraphicsItemPrivate
+{
+    Q_DECLARE_PUBLIC(QAbstractGraphicsShapeItem)
+public:
+
+    QBrush brush;
+    QPen pen;
+
+    // Cached bounding rectangle
+    mutable QRectF boundingRect;
+};
+
+/*!
+    Constructs a QAbstractGraphicsShapeItem. \a parent is passed to
+    QGraphicsItem's constructor.
+*/
+QAbstractGraphicsShapeItem::QAbstractGraphicsShapeItem(QGraphicsItem *parent
+#ifndef Q_QDOC
+                                                       // obsolete argument
+                                                       , QGraphicsScene *scene
+#endif
+    )
+    : QGraphicsItem(*new QAbstractGraphicsShapeItemPrivate, parent, scene)
+{
+}
+
+/*!
+    \internal
+*/
+QAbstractGraphicsShapeItem::QAbstractGraphicsShapeItem(QAbstractGraphicsShapeItemPrivate &dd,
+                                                     QGraphicsItem *parent,
+                                                     QGraphicsScene *scene)
+    : QGraphicsItem(dd, parent, scene)
+{
+}
+
+/*!
+    Destroys a QAbstractGraphicsShapeItem.
+*/
+QAbstractGraphicsShapeItem::~QAbstractGraphicsShapeItem()
+{
+}
+
+/*!
+    Returns the item's pen. If no pen has been set, this function returns
+    QPen(), a default black solid line pen with 0 width.
+*/
+QPen QAbstractGraphicsShapeItem::pen() const
+{
+    Q_D(const QAbstractGraphicsShapeItem);
+    return d->pen;
+}
+
+/*!
+    Sets the pen for this item to \a pen.
+
+    The pen is used to draw the item's outline.
+
+    \sa pen()
+*/
+void QAbstractGraphicsShapeItem::setPen(const QPen &pen)
+{
+    Q_D(QAbstractGraphicsShapeItem);
+    prepareGeometryChange();
+    d->pen = pen;
+    d->boundingRect = QRectF();
+    update();
+}
+
+/*!
+    Returns the item's brush, or an empty brush if no brush has been set.
+
+    \sa setBrush()
+*/
+QBrush QAbstractGraphicsShapeItem::brush() const
+{
+    Q_D(const QAbstractGraphicsShapeItem);
+    return d->brush;
+}
+
+/*!
+    Sets the item's brush to \a brush.
+
+    The item's brush is used to fill the item.
+
+    If you use a brush with a QGradient, the gradient
+    is relative to the item's coordinate system.
+
+    \sa brush()
+*/
+void QAbstractGraphicsShapeItem::setBrush(const QBrush &brush)
+{
+    Q_D(QAbstractGraphicsShapeItem);
+    d->brush = brush;
+    update();
+}
+
+/*!
+    \reimp
+*/
+bool QAbstractGraphicsShapeItem::isObscuredBy(const QGraphicsItem *item) const
+{
+    return QGraphicsItem::isObscuredBy(item);
+}
+
+/*!
+    \reimp
+*/
+QPainterPath QAbstractGraphicsShapeItem::opaqueArea() const
+{
+    Q_D(const QAbstractGraphicsShapeItem);
+    if (d->brush.isOpaque())
+        return isClipped() ? clipPath() : shape();
+    return QGraphicsItem::opaqueArea();
+}
+
+/*!
+    \class QGraphicsPathItem
+    \brief The QGraphicsPathItem class provides a path item that you
+    can add to a QGraphicsScene.
+    \since 4.2
+    \ingroup multimedia
+    \ingroup graphicsview-api
+
+    To set the item's path, pass a QPainterPath to QGraphicsPathItem's
+    constructor, or call the setPath() function. The path() function
+    returns the current path.
+
+    \image graphicsview-pathitem.png
+
+    QGraphicsPathItem uses the path to provide a reasonable
+    implementation of boundingRect(), shape(), and contains(). The
+    paint() function draws the path using the item's associated pen
+    and brush, which you can set by calling the setPen() and
+    setBrush() functions.
+
+    \sa QGraphicsRectItem, QGraphicsEllipseItem, QGraphicsPolygonItem,
+    QGraphicsTextItem, QGraphicsLineItem, QGraphicsPixmapItem, {The Graphics
+    View Framework}
+*/
+
+class QGraphicsPathItemPrivate : public QAbstractGraphicsShapeItemPrivate
+{
+    Q_DECLARE_PUBLIC(QGraphicsPathItem)
+public:
+    QPainterPath path;
+};
+
+/*!
+    Constructs a QGraphicsPath item using \a path as the default path. \a
+    parent is passed to QAbstractGraphicsShapeItem's constructor.
+
+    \sa QGraphicsScene::addItem()
+*/
+QGraphicsPathItem::QGraphicsPathItem(const QPainterPath &path,
+                                     QGraphicsItem *parent
+#ifndef Q_QDOC
+                                     // obsolete argument
+                                     , QGraphicsScene *scene
+#endif
+    )
+    : QAbstractGraphicsShapeItem(*new QGraphicsPathItemPrivate, parent, scene)
+{
+    if (!path.isEmpty())
+        setPath(path);
+}
+
+/*!
+    Constructs a QGraphicsPath. \a parent is passed to
+    QAbstractGraphicsShapeItem's constructor.
+
+    \sa QGraphicsScene::addItem()
+*/
+QGraphicsPathItem::QGraphicsPathItem(QGraphicsItem *parent
+#ifndef Q_QDOC
+                                     // obsolete argument
+                                     , QGraphicsScene *scene
+#endif
+    )
+    : QAbstractGraphicsShapeItem(*new QGraphicsPathItemPrivate, parent, scene)
+{
+}
+
+/*!
+    Destroys the QGraphicsPathItem.
+*/
+QGraphicsPathItem::~QGraphicsPathItem()
+{
+}
+
+/*!
+    Returns the item's path as a QPainterPath. If no item has been set, an
+    empty QPainterPath is returned.
+
+    \sa setPath()
+*/
+QPainterPath QGraphicsPathItem::path() const
+{
+    Q_D(const QGraphicsPathItem);
+    return d->path;
+}
+
+/*!
+    Sets the item's path to be the given \a path.
+
+    \sa path()
+*/
+void QGraphicsPathItem::setPath(const QPainterPath &path)
+{
+    Q_D(QGraphicsPathItem);
+    if (d->path == path)
+        return;
+    prepareGeometryChange();
+    d->path = path;
+    d->boundingRect = QRectF();
+    update();
+}
+
+/*!
+    \reimp
+*/
+QRectF QGraphicsPathItem::boundingRect() const
+{
+    Q_D(const QGraphicsPathItem);
+    if (d->boundingRect.isNull()) {
+        qreal pw = pen().widthF();
+        if (pw == 0.0)
+            d->boundingRect = d->path.controlPointRect();
+        else {
+            d->boundingRect = shape().controlPointRect();
+        }
+    }
+    return d->boundingRect;
+}
+
+/*!
+    \reimp
+*/
+QPainterPath QGraphicsPathItem::shape() const
+{
+    Q_D(const QGraphicsPathItem);
+    return qt_graphicsItem_shapeFromPath(d->path, d->pen);
+}
+
+/*!
+    \reimp
+*/
+bool QGraphicsPathItem::contains(const QPointF &point) const
+{
+    return QAbstractGraphicsShapeItem::contains(point);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsPathItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
+                              QWidget *widget)
+{
+    Q_D(QGraphicsPathItem);
+    Q_UNUSED(widget);
+    painter->setPen(d->pen);
+    painter->setBrush(d->brush);
+    painter->drawPath(d->path);
+
+    if (option->state & QStyle::State_Selected)
+        qt_graphicsItem_highlightSelected(this, painter, option);
+}
+
+/*!
+    \reimp
+*/
+bool QGraphicsPathItem::isObscuredBy(const QGraphicsItem *item) const
+{
+    return QAbstractGraphicsShapeItem::isObscuredBy(item);
+}
+
+/*!
+    \reimp
+*/
+QPainterPath QGraphicsPathItem::opaqueArea() const
+{
+    return QAbstractGraphicsShapeItem::opaqueArea();
+}
+
+/*!
+    \reimp
+*/
+int QGraphicsPathItem::type() const
+{
+    return Type;
+}
+
+/*!
+    \internal
+*/
+bool QGraphicsPathItem::supportsExtension(Extension extension) const
+{
+    Q_UNUSED(extension);
+    return false;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsPathItem::setExtension(Extension extension, const QVariant &variant)
+{
+    Q_UNUSED(extension);
+    Q_UNUSED(variant);
+}
+
+/*!
+    \internal
+*/
+QVariant QGraphicsPathItem::extension(const QVariant &variant) const
+{
+    Q_UNUSED(variant);
+    return QVariant();
+}
+
+/*!
+    \class QGraphicsRectItem
+    \brief The QGraphicsRectItem class provides a rectangle item that you
+    can add to a QGraphicsScene.
+    \since 4.2
+    \ingroup multimedia
+    \ingroup graphicsview-api
+
+    To set the item's rectangle, pass a QRectF to QGraphicsRectItem's
+    constructor, or call the setRect() function. The rect() function
+    returns the current rectangle.
+
+    \image graphicsview-rectitem.png
+
+    QGraphicsRectItem uses the rectangle and the pen width to provide
+    a reasonable implementation of boundingRect(), shape(), and
+    contains(). The paint() function draws the rectangle using the
+    item's associated pen and brush, which you can set by calling the
+    setPen() and setBrush() functions.
+
+    \note The rendering of invalid rectangles, such as those with negative
+    widths or heights, is undefined. If you cannot be sure that you are
+    using valid rectangles (for example, if you are creating
+    rectangles using data from an unreliable source) then you should
+    use QRectF::normalized() to create normalized rectangles, and use
+    those instead.
+
+    \sa QGraphicsPathItem, QGraphicsEllipseItem, QGraphicsPolygonItem,
+    QGraphicsTextItem, QGraphicsLineItem, QGraphicsPixmapItem, {The Graphics
+    View Framework}
+*/
+
+class QGraphicsRectItemPrivate : public QAbstractGraphicsShapeItemPrivate
+{
+    Q_DECLARE_PUBLIC(QGraphicsRectItem)
+public:
+    QRectF rect;
+};
+
+/*!
+    Constructs a QGraphicsRectItem, using \a rect as the default rectangle.
+    \a parent is passed to QAbstractGraphicsShapeItem's constructor.
+
+    \sa QGraphicsScene::addItem()
+*/
+QGraphicsRectItem::QGraphicsRectItem(const QRectF &rect, QGraphicsItem *parent
+#ifndef Q_QDOC
+                                     // obsolete argument
+                                     , QGraphicsScene *scene
+#endif
+    )
+    : QAbstractGraphicsShapeItem(*new QGraphicsRectItemPrivate, parent, scene)
+{
+    setRect(rect);
+}
+
+/*!
+    \fn QGraphicsRectItem::QGraphicsRectItem(qreal x, qreal y, qreal width, qreal height,
+                                     QGraphicsItem *parent)
+
+    Constructs a QGraphicsRectItem with a default rectangle defined
+    by (\a x, \a y) and the given \a width and \a height.
+
+    \a parent is passed to QAbstractGraphicsShapeItem's constructor.
+
+    \sa QGraphicsScene::addItem()
+*/
+QGraphicsRectItem::QGraphicsRectItem(qreal x, qreal y, qreal w, qreal h,
+                                     QGraphicsItem *parent
+#ifndef Q_QDOC
+                                     // obsolete argument
+                                     , QGraphicsScene *scene
+#endif
+    )
+    : QAbstractGraphicsShapeItem(*new QGraphicsRectItemPrivate, parent, scene)
+{
+    setRect(QRectF(x, y, w, h));
+}
+
+/*!
+    Constructs a QGraphicsRectItem. \a parent is passed to
+    QAbstractGraphicsShapeItem's constructor.
+
+    \sa QGraphicsScene::addItem()
+*/
+QGraphicsRectItem::QGraphicsRectItem(QGraphicsItem *parent
+#ifndef Q_QDOC
+                                     // obsolete argument
+                                     , QGraphicsScene *scene
+#endif
+    )
+    : QAbstractGraphicsShapeItem(*new QGraphicsRectItemPrivate, parent, scene)
+{
+}
+
+/*!
+    Destroys the QGraphicsRectItem.
+*/
+QGraphicsRectItem::~QGraphicsRectItem()
+{
+}
+
+/*!
+    Returns the item's rectangle.
+
+    \sa setRect()
+*/
+QRectF QGraphicsRectItem::rect() const
+{
+    Q_D(const QGraphicsRectItem);
+    return d->rect;
+}
+
+/*!
+    \fn void QGraphicsRectItem::setRect(const QRectF &rectangle)
+
+    Sets the item's rectangle to be the given \a rectangle.
+
+    \sa rect()
+*/
+void QGraphicsRectItem::setRect(const QRectF &rect)
+{
+    Q_D(QGraphicsRectItem);
+    if (d->rect == rect)
+        return;
+    prepareGeometryChange();
+    d->rect = rect;
+    d->boundingRect = QRectF();
+    update();
+}
+
+/*!
+    \fn void QGraphicsRectItem::setRect(qreal x, qreal y, qreal width, qreal height)
+    \fn void QGraphicsEllipseItem::setRect(qreal x, qreal y, qreal width, qreal height)
+
+    Sets the item's rectangle to the rectangle defined by (\a x, \a y)
+    and the given \a width and \a height.
+
+    This convenience function is equivalent to calling \c
+    {setRect(QRectF(x, y, width, height))}
+
+    \sa rect()
+*/
+
+/*!
+    \reimp
+*/
+QRectF QGraphicsRectItem::boundingRect() const
+{
+    Q_D(const QGraphicsRectItem);
+    if (d->boundingRect.isNull()) {
+        qreal halfpw = pen().widthF() / 2;
+        d->boundingRect = d->rect;
+        if (halfpw > 0.0)
+            d->boundingRect.adjust(-halfpw, -halfpw, halfpw, halfpw);
+    }
+    return d->boundingRect;
+}
+
+/*!
+    \reimp
+*/
+QPainterPath QGraphicsRectItem::shape() const
+{
+    Q_D(const QGraphicsRectItem);
+    QPainterPath path;
+    path.addRect(d->rect);
+    return qt_graphicsItem_shapeFromPath(path, d->pen);
+}
+
+/*!
+    \reimp
+*/
+bool QGraphicsRectItem::contains(const QPointF &point) const
+{
+    return QAbstractGraphicsShapeItem::contains(point);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsRectItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
+                              QWidget *widget)
+{
+    Q_D(QGraphicsRectItem);
+    Q_UNUSED(widget);
+    painter->setPen(d->pen);
+    painter->setBrush(d->brush);
+    painter->drawRect(d->rect);
+
+    if (option->state & QStyle::State_Selected)
+        qt_graphicsItem_highlightSelected(this, painter, option);
+}
+
+/*!
+    \reimp
+*/
+bool QGraphicsRectItem::isObscuredBy(const QGraphicsItem *item) const
+{
+    return QAbstractGraphicsShapeItem::isObscuredBy(item);
+}
+
+/*!
+    \reimp
+*/
+QPainterPath QGraphicsRectItem::opaqueArea() const
+{
+    return QAbstractGraphicsShapeItem::opaqueArea();
+}
+
+/*!
+    \reimp
+*/
+int QGraphicsRectItem::type() const
+{
+    return Type;
+}
+
+/*!
+    \internal
+*/
+bool QGraphicsRectItem::supportsExtension(Extension extension) const
+{
+    Q_UNUSED(extension);
+    return false;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsRectItem::setExtension(Extension extension, const QVariant &variant)
+{
+    Q_UNUSED(extension);
+    Q_UNUSED(variant);
+}
+
+/*!
+    \internal
+*/
+QVariant QGraphicsRectItem::extension(const QVariant &variant) const
+{
+    Q_UNUSED(variant);
+    return QVariant();
+}
+
+/*!
+    \class QGraphicsEllipseItem
+    \brief The QGraphicsEllipseItem class provides an ellipse item that you
+    can add to a QGraphicsScene.
+    \since 4.2
+    \ingroup multimedia
+    \ingroup graphicsview-api
+
+    QGraphicsEllipseItem respresents an ellipse with a fill and an outline,
+    and you can also use it for ellipse segments (see startAngle(),
+    spanAngle()).
+
+    \table
+        \row
+            \o \inlineimage graphicsview-ellipseitem.png
+            \o \inlineimage graphicsview-ellipseitem-pie.png
+    \endtable
+
+    To set the item's ellipse, pass a QRectF to QGraphicsEllipseItem's
+    constructor, or call setRect(). The rect() function returns the
+    current ellipse geometry.
+
+    QGraphicsEllipseItem uses the rect and the pen width to provide a
+    reasonable implementation of boundingRect(), shape(), and contains(). The
+    paint() function draws the ellipse using the item's associated pen and
+    brush, which you can set by calling setPen() and setBrush().
+
+    \sa QGraphicsPathItem, QGraphicsRectItem, QGraphicsPolygonItem,
+    QGraphicsTextItem, QGraphicsLineItem, QGraphicsPixmapItem, {The Graphics
+    View Framework}
+*/
+
+class QGraphicsEllipseItemPrivate : public QAbstractGraphicsShapeItemPrivate
+{
+    Q_DECLARE_PUBLIC(QGraphicsEllipseItem)
+public:
+    inline QGraphicsEllipseItemPrivate()
+        : startAngle(0), spanAngle(360 * 16)
+    { }
+
+    QRectF rect;
+    int startAngle;
+    int spanAngle;
+};
+
+/*!
+    Constructs a QGraphicsEllipseItem using \a rect as the default rectangle.
+    \a parent is passed to QAbstractGraphicsShapeItem's constructor.
+
+    \sa QGraphicsScene::addItem()
+*/
+QGraphicsEllipseItem::QGraphicsEllipseItem(const QRectF &rect, QGraphicsItem *parent
+#ifndef Q_QDOC
+                                           // obsolete argument
+                                           , QGraphicsScene *scene
+#endif
+    )
+    : QAbstractGraphicsShapeItem(*new QGraphicsEllipseItemPrivate, parent, scene)
+{
+    setRect(rect);
+}
+
+/*!
+    \fn QGraphicsEllipseItem::QGraphicsEllipseItem(qreal x, qreal y, qreal width, qreal height, QGraphicsItem *parent)
+    \since 4.3
+
+    Constructs a QGraphicsEllipseItem using the rectangle defined by (\a x, \a
+    y) and the given \a width and \a height, as the default rectangle. \a
+    parent is passed to QAbstractGraphicsShapeItem's constructor.
+
+    \sa QGraphicsScene::addItem()
+*/
+QGraphicsEllipseItem::QGraphicsEllipseItem(qreal x, qreal y, qreal w, qreal h,
+                                           QGraphicsItem *parent
+#ifndef Q_QDOC
+                                           // obsolete argument
+                                           , QGraphicsScene *scene
+#endif
+    )
+    : QAbstractGraphicsShapeItem(*new QGraphicsEllipseItemPrivate, parent, scene)
+{
+    setRect(x,y,w,h);
+}
+
+
+
+/*!
+    Constructs a QGraphicsEllipseItem. \a parent is passed to
+    QAbstractGraphicsShapeItem's constructor.
+
+    \sa QGraphicsScene::addItem()
+*/
+QGraphicsEllipseItem::QGraphicsEllipseItem(QGraphicsItem *parent
+#ifndef Q_QDOC
+                                           // obsolete argument
+                                           , QGraphicsScene *scene
+#endif
+    )
+    : QAbstractGraphicsShapeItem(*new QGraphicsEllipseItemPrivate, parent, scene)
+{
+}
+
+/*!
+    Destroys the QGraphicsEllipseItem.
+*/
+QGraphicsEllipseItem::~QGraphicsEllipseItem()
+{
+}
+
+/*!
+    Returns the item's ellipse geometry as a QRectF.
+
+    \sa setRect(), QPainter::drawEllipse()
+*/
+QRectF QGraphicsEllipseItem::rect() const
+{
+    Q_D(const QGraphicsEllipseItem);
+    return d->rect;
+}
+
+/*!
+    Sets the item's ellipse geometry to \a rect. The rectangle's left edge
+    defines the left edge of the ellipse, and the rectangle's top edge
+    describes the top of the ellipse. The height and width of the rectangle
+    describe the height and width of the ellipse.
+
+    \sa rect(), QPainter::drawEllipse()
+*/
+void QGraphicsEllipseItem::setRect(const QRectF &rect)
+{
+    Q_D(QGraphicsEllipseItem);
+    if (d->rect == rect)
+        return;
+    prepareGeometryChange();
+    d->rect = rect;
+    d->boundingRect = QRectF();
+    update();
+}
+
+/*!
+    Returns the start angle for an ellipse segment in 16ths of a degree. This
+    angle is used together with spanAngle() for representing an ellipse
+    segment (a pie). By default, the start angle is 0.
+
+    \sa setStartAngle(), spanAngle()
+*/
+int QGraphicsEllipseItem::startAngle() const
+{
+    Q_D(const QGraphicsEllipseItem);
+    return d->startAngle;
+}
+
+/*!
+    Sets the start angle for an ellipse segment to \a angle, which is in 16ths
+    of a degree. This angle is used together with spanAngle() for representing
+    an ellipse segment (a pie). By default, the start angle is 0.
+
+    \sa startAngle(), setSpanAngle(), QPainter::drawPie()
+*/
+void QGraphicsEllipseItem::setStartAngle(int angle)
+{
+    Q_D(QGraphicsEllipseItem);
+    if (angle != d->startAngle) {
+        prepareGeometryChange();
+        d->boundingRect = QRectF();
+        d->startAngle = angle;
+        update();
+    }
+}
+
+/*!
+    Returns the span angle of an ellipse segment in 16ths of a degree. This
+    angle is used together with startAngle() for representing an ellipse
+    segment (a pie). By default, this function returns 5760 (360 * 16, a full
+    ellipse).
+
+    \sa setSpanAngle(), startAngle()
+*/
+int QGraphicsEllipseItem::spanAngle() const
+{
+    Q_D(const QGraphicsEllipseItem);
+    return d->spanAngle;
+}
+
+/*!
+    Sets the span angle for an ellipse segment to \a angle, which is in 16ths
+    of a degree. This angle is used together with startAngle() to represent an
+    ellipse segment (a pie). By default, the span angle is 5760 (360 * 16, a
+    full ellipse).
+
+    \sa spanAngle(), setStartAngle(), QPainter::drawPie()
+*/
+void QGraphicsEllipseItem::setSpanAngle(int angle)
+{
+    Q_D(QGraphicsEllipseItem);
+    if (angle != d->spanAngle) {
+        prepareGeometryChange();
+        d->boundingRect = QRectF();
+        d->spanAngle = angle;
+        update();
+    }
+}
+
+/*!
+    \reimp
+*/
+QRectF QGraphicsEllipseItem::boundingRect() const
+{
+    Q_D(const QGraphicsEllipseItem);
+    if (d->boundingRect.isNull()) {
+        qreal pw = pen().widthF();
+        if (pw == 0.0 && d->spanAngle == 360 * 16)
+            d->boundingRect = d->rect;
+        else
+            d->boundingRect = shape().controlPointRect();
+    }
+    return d->boundingRect;
+}
+
+/*!
+    \reimp
+*/
+QPainterPath QGraphicsEllipseItem::shape() const
+{
+    Q_D(const QGraphicsEllipseItem);
+    QPainterPath path;
+    if (d->rect.isNull())
+        return path;
+    if (d->spanAngle != 360 * 16) {
+        path.moveTo(d->rect.center());
+        path.arcTo(d->rect, d->startAngle / 16.0, d->spanAngle / 16.0);
+    } else {
+        path.addEllipse(d->rect);
+    }
+
+    return qt_graphicsItem_shapeFromPath(path, d->pen);
+}
+
+/*!
+    \reimp
+*/
+bool QGraphicsEllipseItem::contains(const QPointF &point) const
+{
+    return QAbstractGraphicsShapeItem::contains(point);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsEllipseItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
+                                 QWidget *widget)
+{
+    Q_D(QGraphicsEllipseItem);
+    Q_UNUSED(widget);
+    painter->setPen(d->pen);
+    painter->setBrush(d->brush);
+    if ((d->spanAngle != 0) && (qAbs(d->spanAngle) % (360 * 16) == 0))
+        painter->drawEllipse(d->rect);
+    else
+        painter->drawPie(d->rect, d->startAngle, d->spanAngle);
+
+    if (option->state & QStyle::State_Selected)
+        qt_graphicsItem_highlightSelected(this, painter, option);
+}
+
+/*!
+    \reimp
+*/
+bool QGraphicsEllipseItem::isObscuredBy(const QGraphicsItem *item) const
+{
+    return QAbstractGraphicsShapeItem::isObscuredBy(item);
+}
+
+/*!
+    \reimp
+*/
+QPainterPath QGraphicsEllipseItem::opaqueArea() const
+{
+    return QAbstractGraphicsShapeItem::opaqueArea();
+}
+
+/*!
+    \reimp
+*/
+int QGraphicsEllipseItem::type() const
+{
+    return Type;
+}
+
+
+/*!
+    \internal
+*/
+bool QGraphicsEllipseItem::supportsExtension(Extension extension) const
+{
+    Q_UNUSED(extension);
+    return false;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsEllipseItem::setExtension(Extension extension, const QVariant &variant)
+{
+    Q_UNUSED(extension);
+    Q_UNUSED(variant);
+}
+
+/*!
+    \internal
+*/
+QVariant QGraphicsEllipseItem::extension(const QVariant &variant) const
+{
+    Q_UNUSED(variant);
+    return QVariant();
+}
+
+/*!
+    \class QGraphicsPolygonItem
+    \brief The QGraphicsPolygonItem class provides a polygon item that you
+    can add to a QGraphicsScene.
+    \since 4.2
+    \ingroup multimedia
+    \ingroup graphicsview-api
+
+    To set the item's polygon, pass a QPolygonF to
+    QGraphicsPolygonItem's constructor, or call the setPolygon()
+    function. The polygon() function returns the current polygon.
+
+    \image graphicsview-polygonitem.png
+
+    QGraphicsPolygonItem uses the polygon and the pen width to provide
+    a reasonable implementation of boundingRect(), shape(), and
+    contains(). The paint() function draws the polygon using the
+    item's associated pen and brush, which you can set by calling the
+    setPen() and setBrush() functions.
+
+    \sa QGraphicsPathItem, QGraphicsRectItem, QGraphicsEllipseItem,
+    QGraphicsTextItem, QGraphicsLineItem, QGraphicsPixmapItem, {The Graphics
+    View Framework}
+*/
+
+class QGraphicsPolygonItemPrivate : public QAbstractGraphicsShapeItemPrivate
+{
+    Q_DECLARE_PUBLIC(QGraphicsPolygonItem)
+public:
+    inline QGraphicsPolygonItemPrivate()
+        : fillRule(Qt::OddEvenFill)
+    { }
+
+    QPolygonF polygon;
+    Qt::FillRule fillRule;
+};
+
+/*!
+    Constructs a QGraphicsPolygonItem with \a polygon as the default
+    polygon. \a parent is passed to QAbstractGraphicsShapeItem's constructor.
+
+    \sa QGraphicsScene::addItem()
+*/
+QGraphicsPolygonItem::QGraphicsPolygonItem(const QPolygonF &polygon,
+                                           QGraphicsItem *parent
+#ifndef Q_QDOC
+                                           // obsolete argument
+                                           , QGraphicsScene *scene
+#endif
+    )
+    : QAbstractGraphicsShapeItem(*new QGraphicsPolygonItemPrivate, parent, scene)
+{
+    setPolygon(polygon);
+}
+
+/*!
+    Constructs a QGraphicsPolygonItem. \a parent is passed to
+    QAbstractGraphicsShapeItem's constructor.
+
+    \sa QGraphicsScene::addItem()
+*/
+QGraphicsPolygonItem::QGraphicsPolygonItem(QGraphicsItem *parent
+#ifndef Q_QDOC
+                                           // obsolete argument
+                                           , QGraphicsScene *scene
+#endif
+    )
+    : QAbstractGraphicsShapeItem(*new QGraphicsPolygonItemPrivate, parent, scene)
+{
+}
+
+/*!
+    Destroys the QGraphicsPolygonItem.
+*/
+QGraphicsPolygonItem::~QGraphicsPolygonItem()
+{
+}
+
+/*!
+    Returns the item's polygon, or an empty polygon if no polygon
+    has been set.
+
+    \sa setPolygon()
+*/
+QPolygonF QGraphicsPolygonItem::polygon() const
+{
+    Q_D(const QGraphicsPolygonItem);
+    return d->polygon;
+}
+
+/*!
+    Sets the item's polygon to be the given \a polygon.
+
+    \sa polygon()
+*/
+void QGraphicsPolygonItem::setPolygon(const QPolygonF &polygon)
+{
+    Q_D(QGraphicsPolygonItem);
+    if (d->polygon == polygon)
+        return;
+    prepareGeometryChange();
+    d->polygon = polygon;
+    d->boundingRect = QRectF();
+    update();
+}
+
+/*!
+     Returns the fill rule of the polygon. The default fill rule is
+     Qt::OddEvenFill.
+
+     \sa setFillRule(), QPainterPath::fillRule(), QPainter::drawPolygon()
+*/
+Qt::FillRule QGraphicsPolygonItem::fillRule() const
+{
+     Q_D(const QGraphicsPolygonItem);
+     return d->fillRule;
+}
+
+/*!
+     Sets the fill rule of the polygon to \a rule. The default fill rule is
+     Qt::OddEvenFill.
+
+     \sa fillRule(), QPainterPath::fillRule(), QPainter::drawPolygon()
+*/
+void QGraphicsPolygonItem::setFillRule(Qt::FillRule rule)
+{
+     Q_D(QGraphicsPolygonItem);
+     if (rule != d->fillRule) {
+         d->fillRule = rule;
+         update();
+     }
+}
+
+/*!
+    \reimp
+*/
+QRectF QGraphicsPolygonItem::boundingRect() const
+{
+    Q_D(const QGraphicsPolygonItem);
+    if (d->boundingRect.isNull()) {
+        qreal pw = pen().widthF();
+        if (pw == 0.0)
+            d->boundingRect = d->polygon.boundingRect();
+        else
+            d->boundingRect = shape().controlPointRect();
+    }
+    return d->boundingRect;
+}
+
+/*!
+    \reimp
+*/
+QPainterPath QGraphicsPolygonItem::shape() const
+{
+    Q_D(const QGraphicsPolygonItem);
+    QPainterPath path;
+    path.addPolygon(d->polygon);
+    return qt_graphicsItem_shapeFromPath(path, d->pen);
+}
+
+/*!
+    \reimp
+*/
+bool QGraphicsPolygonItem::contains(const QPointF &point) const
+{
+    return QAbstractGraphicsShapeItem::contains(point);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsPolygonItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
+{
+    Q_D(QGraphicsPolygonItem);
+    Q_UNUSED(widget);
+    painter->setPen(d->pen);
+    painter->setBrush(d->brush);
+    painter->drawPolygon(d->polygon, d->fillRule);
+
+    if (option->state & QStyle::State_Selected)
+        qt_graphicsItem_highlightSelected(this, painter, option);
+}
+
+/*!
+    \reimp
+*/
+bool QGraphicsPolygonItem::isObscuredBy(const QGraphicsItem *item) const
+{
+    return QAbstractGraphicsShapeItem::isObscuredBy(item);
+}
+
+/*!
+    \reimp
+*/
+QPainterPath QGraphicsPolygonItem::opaqueArea() const
+{
+    return QAbstractGraphicsShapeItem::opaqueArea();
+}
+
+/*!
+    \reimp
+*/
+int QGraphicsPolygonItem::type() const
+{
+    return Type;
+}
+
+/*!
+    \internal
+*/
+bool QGraphicsPolygonItem::supportsExtension(Extension extension) const
+{
+    Q_UNUSED(extension);
+    return false;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsPolygonItem::setExtension(Extension extension, const QVariant &variant)
+{
+    Q_UNUSED(extension);
+    Q_UNUSED(variant);
+}
+
+/*!
+    \internal
+*/
+QVariant QGraphicsPolygonItem::extension(const QVariant &variant) const
+{
+    Q_UNUSED(variant);
+    return QVariant();
+}
+
+/*!
+    \class QGraphicsLineItem
+    \brief The QGraphicsLineItem class provides a line item that you can add to a
+    QGraphicsScene.
+    \since 4.2
+    \ingroup multimedia
+    \ingroup graphicsview-api
+
+    To set the item's line, pass a QLineF to QGraphicsLineItem's
+    constructor, or call the setLine() function. The line() function
+    returns the current line. By default the line is black with a
+    width of 0, but you can change this by calling setPen().
+
+    \img graphicsview-lineitem.png
+
+    QGraphicsLineItem uses the line and the pen width to provide a reasonable
+    implementation of boundingRect(), shape(), and contains(). The paint()
+    function draws the line using the item's associated pen.
+
+    \sa QGraphicsPathItem, QGraphicsRectItem, QGraphicsEllipseItem,
+    QGraphicsTextItem, QGraphicsPolygonItem, QGraphicsPixmapItem, {The
+    Graphics View Framework}
+*/
+
+class QGraphicsLineItemPrivate : public QGraphicsItemPrivate
+{
+    Q_DECLARE_PUBLIC(QGraphicsLineItem)
+public:
+    QLineF line;
+    QPen pen;
+};
+
+/*!
+    Constructs a QGraphicsLineItem, using \a line as the default line. \a
+    parent is passed to QGraphicsItem's constructor.
+
+    \sa QGraphicsScene::addItem()
+*/
+QGraphicsLineItem::QGraphicsLineItem(const QLineF &line, QGraphicsItem *parent
+#ifndef Q_QDOC
+                                     // obsolete argument
+                                     , QGraphicsScene *scene
+#endif
+    )
+    : QGraphicsItem(*new QGraphicsLineItemPrivate, parent, scene)
+{
+    setLine(line);
+}
+
+/*!
+    Constructs a QGraphicsLineItem, using the line between (\a x1, \a y1) and
+    (\a x2, \a y2) as the default line.  \a parent is passed to
+    QGraphicsItem's constructor.
+
+    \sa QGraphicsScene::addItem()
+*/
+QGraphicsLineItem::QGraphicsLineItem(qreal x1, qreal y1, qreal x2, qreal y2, QGraphicsItem *parent
+#ifndef Q_QDOC
+                                     // obsolete argument
+                                     , QGraphicsScene *scene
+#endif
+    )
+    : QGraphicsItem(*new QGraphicsLineItemPrivate, parent, scene)
+{
+    setLine(x1, y1, x2, y2);
+}
+
+
+
+/*!
+    Constructs a QGraphicsLineItem. \a parent is passed to QGraphicsItem's
+    constructor.
+
+    \sa QGraphicsScene::addItem()
+*/
+QGraphicsLineItem::QGraphicsLineItem(QGraphicsItem *parent
+#ifndef Q_QDOC
+                                     // obsolete argument
+                                     , QGraphicsScene *scene
+#endif
+    )
+    : QGraphicsItem(*new QGraphicsLineItemPrivate, parent, scene)
+{
+}
+
+/*!
+    Destroys the QGraphicsLineItem.
+*/
+QGraphicsLineItem::~QGraphicsLineItem()
+{
+}
+
+/*!
+    Returns the item's pen, or a black solid 0-width pen if no pen has
+    been set.
+
+    \sa setPen()
+*/
+QPen QGraphicsLineItem::pen() const
+{
+    Q_D(const QGraphicsLineItem);
+    return d->pen;
+}
+
+/*!
+    Sets the item's pen to \a pen. If no pen is set, the line will be painted
+    using a black solid 0-width pen.
+
+    \sa pen()
+*/
+void QGraphicsLineItem::setPen(const QPen &pen)
+{
+    Q_D(QGraphicsLineItem);
+    prepareGeometryChange();
+    d->pen = pen;
+    update();
+}
+
+/*!
+    Returns the item's line, or a null line if no line has been set.
+
+    \sa setLine()
+*/
+QLineF QGraphicsLineItem::line() const
+{
+    Q_D(const QGraphicsLineItem);
+    return d->line;
+}
+
+/*!
+    Sets the item's line to be the given \a line.
+
+    \sa line()
+*/
+void QGraphicsLineItem::setLine(const QLineF &line)
+{
+    Q_D(QGraphicsLineItem);
+    if (d->line == line)
+        return;
+    prepareGeometryChange();
+    d->line = line;
+    update();
+}
+
+/*!
+    \fn void QGraphicsLineItem::setLine(qreal x1, qreal y1, qreal x2, qreal y2)
+    \overload
+
+    Sets the item's line to be the line between (\a x1, \a y1) and (\a
+    x2, \a y2).
+
+    This is the same as calling \c {setLine(QLineF(x1, y1, x2, y2))}.
+*/
+
+/*!
+    \reimp
+*/
+QRectF QGraphicsLineItem::boundingRect() const
+{
+    Q_D(const QGraphicsLineItem);
+    if (d->pen.widthF() == 0.0) {
+        const qreal x1 = d->line.p1().x();
+        const qreal x2 = d->line.p2().x();
+        const qreal y1 = d->line.p1().y();
+        const qreal y2 = d->line.p2().y();
+        qreal lx = qMin(x1, x2);
+        qreal rx = qMax(x1, x2);
+        qreal ty = qMin(y1, y2);
+        qreal by = qMax(y1, y2);
+        return QRectF(lx, ty, rx - lx, by - ty);
+    }
+    return shape().controlPointRect();
+}
+
+/*!
+    \reimp
+*/
+QPainterPath QGraphicsLineItem::shape() const
+{
+    Q_D(const QGraphicsLineItem);
+    QPainterPath path;
+    if (d->line == QLineF())
+        return path;
+
+    path.moveTo(d->line.p1());
+    path.lineTo(d->line.p2());
+    return qt_graphicsItem_shapeFromPath(path, d->pen);
+}
+
+/*!
+    \reimp
+*/
+bool QGraphicsLineItem::contains(const QPointF &point) const
+{
+    return QGraphicsItem::contains(point);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsLineItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
+{
+    Q_D(QGraphicsLineItem);
+    Q_UNUSED(widget);
+    painter->setPen(d->pen);
+    painter->drawLine(d->line);
+
+    if (option->state & QStyle::State_Selected)
+        qt_graphicsItem_highlightSelected(this, painter, option);
+}
+
+/*!
+    \reimp
+*/
+bool QGraphicsLineItem::isObscuredBy(const QGraphicsItem *item) const
+{
+    return QGraphicsItem::isObscuredBy(item);
+}
+
+/*!
+    \reimp
+*/
+QPainterPath QGraphicsLineItem::opaqueArea() const
+{
+    return QGraphicsItem::opaqueArea();
+}
+
+/*!
+    \reimp
+*/
+int QGraphicsLineItem::type() const
+{
+    return Type;
+}
+
+/*!
+    \internal
+*/
+bool QGraphicsLineItem::supportsExtension(Extension extension) const
+{
+    Q_UNUSED(extension);
+    return false;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsLineItem::setExtension(Extension extension, const QVariant &variant)
+{
+    Q_UNUSED(extension);
+    Q_UNUSED(variant);
+}
+
+/*!
+    \internal
+*/
+QVariant QGraphicsLineItem::extension(const QVariant &variant) const
+{
+    Q_UNUSED(variant);
+    return QVariant();
+}
+
+/*!
+    \class QGraphicsPixmapItem
+    \brief The QGraphicsPixmapItem class provides a pixmap item that you can add to
+    a QGraphicsScene.
+    \since 4.2
+    \ingroup multimedia
+    \ingroup graphicsview-api
+
+    To set the item's pixmap, pass a QPixmap to QGraphicsPixmapItem's
+    constructor, or call the setPixmap() function. The pixmap()
+    function returns the current pixmap.
+
+    QGraphicsPixmapItem uses pixmap's optional alpha mask to provide a
+    reasonable implementation of boundingRect(), shape(), and contains().
+
+    \image graphicsview-pixmapitem.png
+
+    The pixmap is drawn at the item's (0, 0) coordinate, as returned by
+    offset(). You can change the drawing offset by calling setOffset().
+
+    You can set the pixmap's transformation mode by calling
+    setTransformationMode(). By default, Qt::FastTransformation is used, which
+    provides fast, non-smooth scaling. Qt::SmoothTransformation enables
+    QPainter::SmoothPixmapTransform on the painter, and the quality depends on
+    the platform and viewport. The result is usually not as good as calling
+    QPixmap::scale() directly. Call transformationMode() to get the current
+    transformation mode for the item.
+
+    \sa QGraphicsPathItem, QGraphicsRectItem, QGraphicsEllipseItem,
+    QGraphicsTextItem, QGraphicsPolygonItem, QGraphicsLineItem, {The
+    Graphics View Framework}
+*/
+
+/*!
+    \enum QGraphicsPixmapItem::ShapeMode
+
+    This enum describes how QGraphicsPixmapItem calculates its shape and
+    opaque area.
+
+    The default value is MaskShape.
+
+    \value MaskShape The shape is determined by calling QPixmap::mask().
+    This shape includes only the opaque pixels of the pixmap.
+    Because the shape is more complex, however, it can be slower than the other modes,
+    and uses more memory.
+
+    \value BoundingRectShape The shape is determined by tracing the outline of
+    the pixmap. This is the fastest shape mode, but it does not take into account
+    any transparent areas on the pixmap.
+
+    \value HeuristicMaskShape The shape is determine by calling
+    QPixmap::createHeuristicMask().  The performance and memory consumption
+    is similar to MaskShape.
+*/
+
+class QGraphicsPixmapItemPrivate : public QGraphicsItemPrivate
+{
+    Q_DECLARE_PUBLIC(QGraphicsPixmapItem)
+public:
+    QGraphicsPixmapItemPrivate()
+        : transformationMode(Qt::FastTransformation),
+        shapeMode(QGraphicsPixmapItem::MaskShape),
+        hasShape(false)
+    {}
+
+    QPixmap pixmap;
+    Qt::TransformationMode transformationMode;
+    QPointF offset;
+    QGraphicsPixmapItem::ShapeMode shapeMode;
+    QPainterPath shape;
+    bool hasShape;
+
+    void updateShape()
+    {
+        extern QPainterPath qt_regionToPath(const QRegion &region);
+        shape = QPainterPath();
+        switch (shapeMode) {
+        case QGraphicsPixmapItem::MaskShape: {
+            QBitmap mask = pixmap.mask();
+            if (!mask.isNull()) {
+                shape = qt_regionToPath(QRegion(mask).translated(offset.toPoint()));
+                break;
+            }
+            // FALL THROUGH
+        }
+        case QGraphicsPixmapItem::BoundingRectShape:
+            shape.addRect(QRectF(offset.x(), offset.y(), pixmap.width(), pixmap.height()));
+            break;
+        case QGraphicsPixmapItem::HeuristicMaskShape:
+#ifndef QT_NO_IMAGE_HEURISTIC_MASK
+            shape = qt_regionToPath(QRegion(pixmap.createHeuristicMask()).translated(offset.toPoint()));
+#else
+            shape.addRect(QRectF(offset.x(), offset.y(), pixmap.width(), pixmap.height()));
+#endif
+            break;
+        }
+    }
+};
+
+/*!
+    Constructs a QGraphicsPixmapItem, using \a pixmap as the default pixmap.
+    \a parent is passed to QGraphicsItem's constructor.
+
+    \sa QGraphicsScene::addItem()
+*/
+QGraphicsPixmapItem::QGraphicsPixmapItem(const QPixmap &pixmap,
+                                         QGraphicsItem *parent
+#ifndef Q_QDOC
+                                         // obsolete argument
+                                         , QGraphicsScene *scene
+#endif
+    )
+    : QGraphicsItem(*new QGraphicsPixmapItemPrivate, parent, scene)
+{
+    setPixmap(pixmap);
+}
+
+/*!
+    Constructs a QGraphicsPixmapItem. \a parent is passed to QGraphicsItem's
+    constructor.
+
+    \sa QGraphicsScene::addItem()
+*/
+QGraphicsPixmapItem::QGraphicsPixmapItem(QGraphicsItem *parent
+#ifndef Q_QDOC
+                                         // obsolete argument
+                                         , QGraphicsScene *scene
+#endif
+    )
+    : QGraphicsItem(*new QGraphicsPixmapItemPrivate, parent, scene)
+{
+}
+
+/*!
+    Destroys the QGraphicsPixmapItem.
+*/
+QGraphicsPixmapItem::~QGraphicsPixmapItem()
+{
+}
+
+/*!
+    Sets the item's pixmap to \a pixmap.
+
+    \sa pixmap()
+*/
+void QGraphicsPixmapItem::setPixmap(const QPixmap &pixmap)
+{
+    Q_D(QGraphicsPixmapItem);
+    prepareGeometryChange();
+    d->pixmap = pixmap;
+    d->hasShape = false;
+    update();
+}
+
+/*!
+    Returns the item's pixmap, or an invalid QPixmap if no pixmap has been
+    set.
+
+    \sa setPixmap()
+*/
+QPixmap QGraphicsPixmapItem::pixmap() const
+{
+    Q_D(const QGraphicsPixmapItem);
+    return d->pixmap;
+}
+
+/*!
+    Returns the transformation mode of the pixmap. The default mode is
+    Qt::FastTransformation, which provides quick transformation with no
+    smoothing.
+
+    \sa setTransformationMode()
+*/
+Qt::TransformationMode QGraphicsPixmapItem::transformationMode() const
+{
+    Q_D(const QGraphicsPixmapItem);
+    return d->transformationMode;
+}
+
+/*!
+    Sets the pixmap item's transformation mode to \a mode, and toggles an
+    update of the item. The default mode is Qt::FastTransformation, which
+    provides quick transformation with no smoothing.
+
+    Qt::SmoothTransformation enables QPainter::SmoothPixmapTransform on the
+    painter, and the quality depends on the platform and viewport. The result
+    is usually not as good as calling QPixmap::scale() directly.
+
+    \sa transformationMode()
+*/
+void QGraphicsPixmapItem::setTransformationMode(Qt::TransformationMode mode)
+{
+    Q_D(QGraphicsPixmapItem);
+    if (mode != d->transformationMode) {
+        d_ptr->updateHelper();
+        d->transformationMode = mode;
+        update();
+    }
+}
+
+/*!
+    Returns the pixmap item's \e offset, which defines the point of the
+    top-left corner of the pixmap, in local coordinates.
+
+    \sa setOffset()
+*/
+QPointF QGraphicsPixmapItem::offset() const
+{
+    Q_D(const QGraphicsPixmapItem);
+    return d->offset;
+}
+
+/*!
+    Sets the pixmap item's offset to \a offset. QGraphicsPixmapItem will draw
+    its pixmap using \a offset for its top-left corner.
+
+    \sa offset()
+*/
+void QGraphicsPixmapItem::setOffset(const QPointF &offset)
+{
+    Q_D(QGraphicsPixmapItem);
+    if (d->offset == offset)
+        return;
+    prepareGeometryChange();
+    d->offset = offset;
+    d->hasShape = false;
+    update();
+}
+
+/*!
+    \fn void QGraphicsPixmapItem::setOffset(qreal x, qreal y)
+    \since 4.3
+
+    This convenience function is equivalent to calling setOffset(QPointF(\a x, \a y)).
+*/
+
+/*!
+    \reimp
+*/
+QRectF QGraphicsPixmapItem::boundingRect() const
+{
+    Q_D(const QGraphicsPixmapItem);
+    qreal pw = 1.0;
+    if (d->pixmap.isNull())
+        return QRectF();
+    return QRectF(d->offset, d->pixmap.size()).adjusted(-pw/2, -pw/2, pw/2, pw/2);
+}
+
+/*!
+    \reimp
+*/
+QPainterPath QGraphicsPixmapItem::shape() const
+{
+    Q_D(const QGraphicsPixmapItem);
+    if (!d->hasShape) {
+        QGraphicsPixmapItemPrivate *thatD = const_cast<QGraphicsPixmapItemPrivate *>(d);
+        thatD->updateShape();
+        thatD->hasShape = true;
+    }
+    return d_func()->shape;
+}
+
+/*!
+    \reimp
+*/
+bool QGraphicsPixmapItem::contains(const QPointF &point) const
+{
+    return QGraphicsItem::contains(point);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsPixmapItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
+                                QWidget *widget)
+{
+    Q_D(QGraphicsPixmapItem);
+    Q_UNUSED(widget);
+
+    painter->setRenderHint(QPainter::SmoothPixmapTransform,
+                           (d->transformationMode == Qt::SmoothTransformation));
+
+    QRectF exposed = option->exposedRect.adjusted(-1, -1, 1, 1);
+    exposed &= QRectF(d->offset.x(), d->offset.y(), d->pixmap.width(), d->pixmap.height());
+    painter->drawPixmap(exposed, d->pixmap, exposed.translated(-d->offset));
+
+    if (option->state & QStyle::State_Selected)
+        qt_graphicsItem_highlightSelected(this, painter, option);
+}
+
+/*!
+    \reimp
+*/
+bool QGraphicsPixmapItem::isObscuredBy(const QGraphicsItem *item) const
+{
+    return QGraphicsItem::isObscuredBy(item);
+}
+
+/*!
+    \reimp
+*/
+QPainterPath QGraphicsPixmapItem::opaqueArea() const
+{
+    return shape();
+}
+
+/*!
+    \reimp
+*/
+int QGraphicsPixmapItem::type() const
+{
+    return Type;
+}
+
+/*!
+    Returns the item's shape mode. The shape mode describes how
+    QGraphicsPixmapItem calculates its shape. The default mode is MaskShape.
+
+    \sa setShapeMode(), ShapeMode
+*/
+QGraphicsPixmapItem::ShapeMode QGraphicsPixmapItem::shapeMode() const
+{
+    return d_func()->shapeMode;
+}
+
+/*!
+    Sets the item's shape mode to \a mode. The shape mode describes how
+    QGraphicsPixmapItem calculates its shape. The default mode is MaskShape.
+
+    \sa shapeMode(), ShapeMode
+*/
+void QGraphicsPixmapItem::setShapeMode(ShapeMode mode)
+{
+    Q_D(QGraphicsPixmapItem);
+    if (d->shapeMode == mode)
+        return;
+    d->shapeMode = mode;
+    d->hasShape = false;
+}
+
+/*!
+    \internal
+*/
+bool QGraphicsPixmapItem::supportsExtension(Extension extension) const
+{
+    Q_UNUSED(extension);
+    return false;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsPixmapItem::setExtension(Extension extension, const QVariant &variant)
+{
+    Q_UNUSED(extension);
+    Q_UNUSED(variant);
+}
+
+/*!
+    \internal
+*/
+QVariant QGraphicsPixmapItem::extension(const QVariant &variant) const
+{
+    Q_UNUSED(variant);
+    return QVariant();
+}
+
+/*!
+    \class QGraphicsTextItem
+    \brief The QGraphicsTextItem class provides a text item that you can add to
+    a QGraphicsScene to display formatted text.
+    \since 4.2
+    \ingroup multimedia
+    \ingroup graphicsview-api
+
+    If you only need to show plain text in an item, consider using QGraphicsSimpleTextItem
+    instead.
+
+    To set the item's text, pass a QString to QGraphicsTextItem's
+    constructor, or call setHtml()/setPlainText().
+
+    QGraphicsTextItem uses the text's formatted size and the associated font
+    to provide a reasonable implementation of boundingRect(), shape(),
+    and contains(). You can set the font by calling setFont().
+
+    It is possible to make the item editable by setting the Qt::TextEditorInteraction flag
+    using setTextInteractionFlags().
+
+    The item's preferred text width can be set using setTextWidth() and obtained
+    using textWidth().
+
+    \note In order to align HTML text in the center, the item's text width must be set.
+
+    \img graphicsview-textitem.png
+
+    \note QGraphicsTextItem accepts \l{QGraphicsItem::acceptHoverEvents()}{hover events}
+          by default. You can change this with \l{QGraphicsItem::}{setAcceptHoverEvents()}.
+
+    \sa QGraphicsSimpleTextItem, QGraphicsPathItem, QGraphicsRectItem,
+        QGraphicsEllipseItem, QGraphicsPixmapItem, QGraphicsPolygonItem,
+        QGraphicsLineItem, {The Graphics View Framework}
+*/
+
+class QGraphicsTextItemPrivate
+{
+public:
+    QGraphicsTextItemPrivate()
+        : control(0), pageNumber(0), useDefaultImpl(false), tabChangesFocus(false)
+    { }
+
+    mutable QTextControl *control;
+    QTextControl *textControl() const;
+
+    inline QPointF controlOffset() const
+    { return QPointF(0., pageNumber * control->document()->pageSize().height()); }
+    inline void sendControlEvent(QEvent *e)
+    { if (control) control->processEvent(e, controlOffset()); }
+
+    void _q_updateBoundingRect(const QSizeF &);
+    void _q_update(QRectF);
+    void _q_ensureVisible(QRectF);
+    bool _q_mouseOnEdge(QGraphicsSceneMouseEvent *);
+
+    QRectF boundingRect;
+    int pageNumber;
+    bool useDefaultImpl;
+    bool tabChangesFocus;
+
+    QGraphicsTextItem *qq;
+};
+
+/*!
+    Constructs a QGraphicsTextItem, using \a text as the default plain
+    text. \a parent is passed to QGraphicsItem's constructor.
+
+    \sa QGraphicsScene::addItem()
+*/
+QGraphicsTextItem::QGraphicsTextItem(const QString &text, QGraphicsItem *parent
+#ifndef Q_QDOC
+                                     // obsolete argument
+                                     , QGraphicsScene *scene
+#endif
+    )
+    : QGraphicsItem(parent, scene), dd(new QGraphicsTextItemPrivate)
+{
+    dd->qq = this;
+    if (!text.isEmpty())
+        setPlainText(text);
+    setAcceptDrops(true);
+    setAcceptHoverEvents(true);
+}
+
+/*!
+    Constructs a QGraphicsTextItem. \a parent is passed to QGraphicsItem's
+    constructor.
+
+    \sa QGraphicsScene::addItem()
+*/
+QGraphicsTextItem::QGraphicsTextItem(QGraphicsItem *parent
+#ifndef Q_QDOC
+                                     // obsolete argument
+                                     , QGraphicsScene *scene
+#endif
+    )
+    : QGraphicsItem(parent, scene), dd(new QGraphicsTextItemPrivate)
+{
+    dd->qq = this;
+    setAcceptDrops(true);
+    setAcceptHoverEvents(true);
+}
+
+/*!
+    Destroys the QGraphicsTextItem.
+*/
+QGraphicsTextItem::~QGraphicsTextItem()
+{
+    delete dd;
+}
+
+/*!
+    Returns the item's text converted to HTML, or an empty QString if no text has been set.
+
+    \sa setHtml()
+*/
+QString QGraphicsTextItem::toHtml() const
+{
+#ifndef QT_NO_TEXTHTMLPARSER
+    if (dd->control)
+        return dd->control->toHtml();
+#endif
+    return QString();
+}
+
+/*!
+    Sets the item's text to \a text, assuming that text is HTML formatted. If
+    the item has keyboard input focus, this function will also call
+    ensureVisible() to ensure that the text is visible in all viewports.
+
+    \sa toHtml(), hasFocus(), QGraphicsSimpleTextItem
+*/
+void QGraphicsTextItem::setHtml(const QString &text)
+{
+    dd->textControl()->setHtml(text);
+}
+
+/*!
+    Returns the item's text converted to plain text, or an empty QString if no text has been set.
+
+    \sa setPlainText()
+*/
+QString QGraphicsTextItem::toPlainText() const
+{
+    if (dd->control)
+        return dd->control->toPlainText();
+    return QString();
+}
+
+/*!
+    Sets the item's text to \a text. If the item has keyboard input focus,
+    this function will also call ensureVisible() to ensure that the text is
+    visible in all viewports.
+
+    \sa toHtml(), hasFocus()
+*/
+void QGraphicsTextItem::setPlainText(const QString &text)
+{
+    dd->textControl()->setPlainText(text);
+}
+
+/*!
+    Returns the item's font, which is used to render the text.
+
+    \sa setFont()
+*/
+QFont QGraphicsTextItem::font() const
+{
+    if (!dd->control)
+        return QFont();
+    return dd->control->document()->defaultFont();
+}
+
+/*!
+    Sets the font used to render the text item to \a font.
+
+    \sa font()
+*/
+void QGraphicsTextItem::setFont(const QFont &font)
+{
+    dd->textControl()->document()->setDefaultFont(font);
+}
+
+/*!
+    Sets the color for unformatted text to \a col.
+*/
+void QGraphicsTextItem::setDefaultTextColor(const QColor &col)
+{
+    QTextControl *c = dd->textControl();
+    QPalette pal = c->palette();
+    pal.setColor(QPalette::Text, col);
+    c->setPalette(pal);
+}
+
+/*!
+    Returns the default text color that is used to for unformatted text.
+*/
+QColor QGraphicsTextItem::defaultTextColor() const
+{
+    return dd->textControl()->palette().color(QPalette::Text);
+}
+
+/*!
+    \reimp
+*/
+QRectF QGraphicsTextItem::boundingRect() const
+{
+    return dd->boundingRect;
+}
+
+/*!
+    \reimp
+*/
+QPainterPath QGraphicsTextItem::shape() const
+{
+    if (!dd->control)
+        return QPainterPath();
+    QPainterPath path;
+    path.addRect(dd->boundingRect);
+    return path;
+}
+
+/*!
+    \reimp
+*/
+bool QGraphicsTextItem::contains(const QPointF &point) const
+{
+    return dd->boundingRect.contains(point);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsTextItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
+                              QWidget *widget)
+{
+    Q_UNUSED(widget);
+    if (dd->control) {
+        painter->save();
+        QRectF r = option->exposedRect;
+        painter->translate(-dd->controlOffset());
+        r.translate(dd->controlOffset());
+
+        QTextDocument *doc = dd->control->document();
+        QTextDocumentLayout *layout = qobject_cast<QTextDocumentLayout *>(doc->documentLayout());
+
+        // the layout might need to expand the root frame to
+        // the viewport if NoWrap is set
+        if (layout)
+            layout->setViewport(dd->boundingRect);
+
+        dd->control->drawContents(painter, r);
+
+        if (layout)
+            layout->setViewport(QRect());
+
+        painter->restore();
+    }
+
+    if (option->state & (QStyle::State_Selected | QStyle::State_HasFocus))
+        qt_graphicsItem_highlightSelected(this, painter, option);
+}
+
+/*!
+    \reimp
+*/
+bool QGraphicsTextItem::isObscuredBy(const QGraphicsItem *item) const
+{
+    return QGraphicsItem::isObscuredBy(item);
+}
+
+/*!
+    \reimp
+*/
+QPainterPath QGraphicsTextItem::opaqueArea() const
+{
+    return QGraphicsItem::opaqueArea();
+}
+
+/*!
+    \reimp
+*/
+int QGraphicsTextItem::type() const
+{
+    return Type;
+}
+
+/*!
+    Sets the preferred width for the item's text. If the actual text
+    is wider than the specified width then it will be broken into
+    multiple lines.
+
+    If \a width is set to -1 then the text will not be broken into
+    multiple lines unless it is enforced through an explicit line
+    break or a new paragraph.
+
+    The default value is -1.
+
+    Note that QGraphicsTextItem keeps a QTextDocument internally,
+    which is used to calculate the text width.
+
+    \sa textWidth(), QTextDocument::setTextWidth()
+*/
+void QGraphicsTextItem::setTextWidth(qreal width)
+{
+    dd->textControl()->setTextWidth(width);
+}
+
+/*!
+    Returns the text width.
+
+    The width is calculated with the QTextDocument that
+    QGraphicsTextItem keeps internally.
+
+    \sa setTextWidth(), QTextDocument::textWidth()
+*/
+qreal QGraphicsTextItem::textWidth() const
+{
+    if (!dd->control)
+        return -1;
+    return dd->control->textWidth();
+}
+
+/*!
+    Adjusts the text item to a reasonable size.
+*/
+void QGraphicsTextItem::adjustSize()
+{
+    if (dd->control)
+        dd->control->adjustSize();
+}
+
+/*!
+    Sets the text document \a document on the item.
+*/
+void QGraphicsTextItem::setDocument(QTextDocument *document)
+{
+    dd->textControl()->setDocument(document);
+    dd->_q_updateBoundingRect(dd->control->size());
+}
+
+/*!
+    Returns the item's text document.
+*/
+QTextDocument *QGraphicsTextItem::document() const
+{
+    return dd->textControl()->document();
+}
+
+/*!
+    \reimp
+*/
+bool QGraphicsTextItem::sceneEvent(QEvent *event)
+{
+    QEvent::Type t = event->type();
+    if (!dd->tabChangesFocus && (t == QEvent::KeyPress || t == QEvent::KeyRelease)) {
+        int k = ((QKeyEvent *)event)->key();
+        if (k == Qt::Key_Tab || k == Qt::Key_Backtab) {
+            dd->sendControlEvent(event);
+            return true;
+        }
+    }
+    return QGraphicsItem::sceneEvent(event);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsTextItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
+{
+    if ((QGraphicsItem::d_ptr->flags & (ItemIsSelectable | ItemIsMovable))
+	&& (event->buttons() & Qt::LeftButton) && dd->_q_mouseOnEdge(event)) {
+	// User left-pressed on edge of selectable/movable item, use
+	// base impl.
+	dd->useDefaultImpl = true;
+    } else if (event->buttons() == event->button()
+	       && dd->control->textInteractionFlags() == Qt::NoTextInteraction) {
+	// User pressed first button on non-interactive item.
+	dd->useDefaultImpl = true;
+    }
+    if (dd->useDefaultImpl) {
+        QGraphicsItem::mousePressEvent(event);
+	if (!event->isAccepted())
+	    dd->useDefaultImpl = false;
+        return;
+    }
+    dd->sendControlEvent(event);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsTextItem::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
+{
+    if (dd->useDefaultImpl) {
+        QGraphicsItem::mouseMoveEvent(event);
+        return;
+    }
+    dd->sendControlEvent(event);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsTextItem::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
+{
+    if (dd->useDefaultImpl) {
+        QGraphicsItem::mouseReleaseEvent(event);
+	if (dd->control->textInteractionFlags() == Qt::NoTextInteraction
+	    && !event->buttons()) {
+	    // User released last button on non-interactive item.
+            dd->useDefaultImpl = false;
+	} else  if ((event->buttons() & Qt::LeftButton) == 0) {
+	    // User released the left button on an interactive item.
+            dd->useDefaultImpl = false;
+	}
+        return;
+    }
+    dd->sendControlEvent(event);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsTextItem::mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event)
+{
+    if (dd->useDefaultImpl) {
+        QGraphicsItem::mouseDoubleClickEvent(event);
+        return;
+    }
+
+    if (!hasFocus()) {
+        QGraphicsItem::mouseDoubleClickEvent(event);
+        return;
+    }
+
+    dd->sendControlEvent(event);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsTextItem::contextMenuEvent(QGraphicsSceneContextMenuEvent *event)
+{
+    dd->sendControlEvent(event);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsTextItem::keyPressEvent(QKeyEvent *event)
+{
+    dd->sendControlEvent(event);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsTextItem::keyReleaseEvent(QKeyEvent *event)
+{
+    dd->sendControlEvent(event);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsTextItem::focusInEvent(QFocusEvent *event)
+{
+    dd->sendControlEvent(event);
+    update();
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsTextItem::focusOutEvent(QFocusEvent *event)
+{
+    dd->sendControlEvent(event);
+    update();
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsTextItem::dragEnterEvent(QGraphicsSceneDragDropEvent *event)
+{
+    dd->sendControlEvent(event);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsTextItem::dragLeaveEvent(QGraphicsSceneDragDropEvent *event)
+{
+    dd->sendControlEvent(event);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsTextItem::dragMoveEvent(QGraphicsSceneDragDropEvent *event)
+{
+    dd->sendControlEvent(event);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsTextItem::dropEvent(QGraphicsSceneDragDropEvent *event)
+{
+    dd->sendControlEvent(event);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsTextItem::inputMethodEvent(QInputMethodEvent *event)
+{
+    dd->sendControlEvent(event);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsTextItem::hoverEnterEvent(QGraphicsSceneHoverEvent *event)
+{
+    dd->sendControlEvent(event);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsTextItem::hoverMoveEvent(QGraphicsSceneHoverEvent *event)
+{
+    dd->sendControlEvent(event);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsTextItem::hoverLeaveEvent(QGraphicsSceneHoverEvent *event)
+{
+    dd->sendControlEvent(event);
+}
+
+/*!
+    \reimp
+*/
+QVariant QGraphicsTextItem::inputMethodQuery(Qt::InputMethodQuery query) const
+{
+    QVariant v;
+    if (dd->control)
+        v = dd->control->inputMethodQuery(query);
+    if (v.type() == QVariant::RectF)
+        v = v.toRectF().translated(-dd->controlOffset());
+    else if (v.type() == QVariant::PointF)
+        v = v.toPointF() - dd->controlOffset();
+    else if (v.type() == QVariant::Rect)
+        v = v.toRect().translated(-dd->controlOffset().toPoint());
+    else if (v.type() == QVariant::Point)
+        v = v.toPoint() - dd->controlOffset().toPoint();
+    return v;
+}
+
+/*!
+    \internal
+*/
+bool QGraphicsTextItem::supportsExtension(Extension extension) const
+{
+    Q_UNUSED(extension);
+    return false;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsTextItem::setExtension(Extension extension, const QVariant &variant)
+{
+    Q_UNUSED(extension);
+    Q_UNUSED(variant);
+}
+
+/*!
+    \internal
+*/
+QVariant QGraphicsTextItem::extension(const QVariant &variant) const
+{
+    Q_UNUSED(variant);
+    return QVariant();
+}
+
+/*!
+    \internal
+*/
+void QGraphicsTextItemPrivate::_q_update(QRectF rect)
+{
+    if (rect.isValid()) {
+        rect.translate(-controlOffset());
+    } else {
+        rect = boundingRect;
+    }
+    if (rect.intersects(boundingRect))
+        qq->update(rect);
+}
+
+/*!
+    \internal
+*/
+void QGraphicsTextItemPrivate::_q_updateBoundingRect(const QSizeF &size)
+{
+    if (!control) return; // can't happen
+    const QSizeF pageSize = control->document()->pageSize();
+    // paged items have a constant (page) size
+    if (size == boundingRect.size() || pageSize.height() != -1)
+        return;
+    qq->prepareGeometryChange();
+    boundingRect.setSize(size);
+    qq->update();
+}
+
+/*!
+    \internal
+*/
+void QGraphicsTextItemPrivate::_q_ensureVisible(QRectF rect)
+{
+    if (qq->hasFocus()) {
+        rect.translate(-controlOffset());
+        qq->ensureVisible(rect, /*xmargin=*/0, /*ymargin=*/0);
+    }
+}
+
+QTextControl *QGraphicsTextItemPrivate::textControl() const
+{
+    if (!control) {
+        QGraphicsTextItem *that = const_cast<QGraphicsTextItem *>(qq);
+        control = new QTextControl(that);
+        control->setTextInteractionFlags(Qt::NoTextInteraction);
+
+        QObject::connect(control, SIGNAL(updateRequest(QRectF)),
+                         qq, SLOT(_q_update(QRectF)));
+        QObject::connect(control, SIGNAL(documentSizeChanged(QSizeF)),
+                         qq, SLOT(_q_updateBoundingRect(QSizeF)));
+        QObject::connect(control, SIGNAL(visibilityRequest(QRectF)),
+                         qq, SLOT(_q_ensureVisible(QRectF)));
+        QObject::connect(control, SIGNAL(linkActivated(QString)),
+                         qq, SIGNAL(linkActivated(QString)));
+        QObject::connect(control, SIGNAL(linkHovered(QString)),
+                         qq, SIGNAL(linkHovered(QString)));
+
+        const QSizeF pgSize = control->document()->pageSize();
+        if (pgSize.height() != -1) {
+            qq->prepareGeometryChange();
+            that->dd->boundingRect.setSize(pgSize);
+            qq->update();
+        } else {
+            that->dd->_q_updateBoundingRect(control->size());
+        }
+    }
+    return control;
+}
+
+/*!
+    \internal
+*/
+bool QGraphicsTextItemPrivate::_q_mouseOnEdge(QGraphicsSceneMouseEvent *event)
+{
+    QPainterPath path;
+    path.addRect(qq->boundingRect());
+
+    QPainterPath docPath;
+    const QTextFrameFormat format = control->document()->rootFrame()->frameFormat();
+    docPath.addRect(
+        qq->boundingRect().adjusted(
+            format.leftMargin(),
+            format.topMargin(),
+            -format.rightMargin(),
+            -format.bottomMargin()));
+
+    return path.subtracted(docPath).contains(event->pos());
+}
+
+/*!
+    \fn QGraphicsTextItem::linkActivated(const QString &link)
+
+    This signal is emitted when the user clicks on a link on a text item
+    that enables Qt::LinksAccessibleByMouse or Qt::LinksAccessibleByKeyboard.
+    \a link is the link that was clicked.
+
+    \sa setTextInteractionFlags()
+*/
+
+/*!
+    \fn QGraphicsTextItem::linkHovered(const QString &link)
+
+    This signal is emitted when the user hovers over a link on a text item
+    that enables Qt::LinksAccessibleByMouse. \a link is
+    the link that was hovered over.
+
+    \sa setTextInteractionFlags()
+*/
+
+/*!
+    Sets the flags \a flags to specify how the text item should react to user
+    input.
+
+    The default for a QGraphicsTextItem is Qt::NoTextInteraction. Setting a
+    value different to Qt::NoTextInteraction will also set the ItemIsFocusable
+    QGraphicsItem flag.
+
+    By default, the text is read-only. To transform the item into an editor,
+    set the Qt::TextEditable flag.
+*/
+void QGraphicsTextItem::setTextInteractionFlags(Qt::TextInteractionFlags flags)
+{
+    if (flags == Qt::NoTextInteraction)
+        setFlags(this->flags() & ~QGraphicsItem::ItemIsFocusable);
+    else
+        setFlags(this->flags() | QGraphicsItem::ItemIsFocusable);
+    dd->textControl()->setTextInteractionFlags(flags);
+}
+
+/*!
+    Returns the current text interaction flags.
+
+    \sa setTextInteractionFlags()
+*/
+Qt::TextInteractionFlags QGraphicsTextItem::textInteractionFlags() const
+{
+    if (!dd->control)
+        return Qt::NoTextInteraction;
+    return dd->control->textInteractionFlags();
+}
+
+/*!
+    \since 4.5
+
+    If \a b is true, the \gui Tab key will cause the widget to change focus;
+    otherwise, the tab key will insert a tab into the document.
+
+    In some occasions text edits should not allow the user to input tabulators
+    or change indentation using the \gui Tab key, as this breaks the focus
+    chain. The default is false.
+
+    \sa tabChangesFocus(), ItemIsFocusable, textInteractionFlags()
+*/
+void QGraphicsTextItem::setTabChangesFocus(bool b)
+{
+    dd->tabChangesFocus = b;
+}
+
+/*!
+    \since 4.5
+
+    Returns true if the \gui Tab key will cause the widget to change focus;
+    otherwise, false is returned.
+
+    \sa setTabChangesFocus()
+*/
+bool QGraphicsTextItem::tabChangesFocus() const
+{
+    return dd->tabChangesFocus;
+}
+
+/*!
+    \property QGraphicsTextItem::openExternalLinks
+
+    Specifies whether QGraphicsTextItem should automatically open links using
+    QDesktopServices::openUrl() instead of emitting the
+    linkActivated signal.
+
+    The default value is false.
+*/
+void QGraphicsTextItem::setOpenExternalLinks(bool open)
+{
+    dd->textControl()->setOpenExternalLinks(open);
+}
+
+bool QGraphicsTextItem::openExternalLinks() const
+{
+    if (!dd->control)
+        return false;
+    return dd->control->openExternalLinks();
+}
+
+/*!
+    \property QGraphicsTextItem::textCursor
+
+    This property represents the visible text cursor in an editable
+    text item.
+
+    By default, if the item's text has not been set, this property
+    contains a null text cursor; otherwise it contains a text cursor
+    placed at the start of the item's document.
+*/
+void QGraphicsTextItem::setTextCursor(const QTextCursor &cursor)
+{
+    dd->textControl()->setTextCursor(cursor);
+}
+
+QTextCursor QGraphicsTextItem::textCursor() const
+{
+    if (!dd->control)
+        return QTextCursor();
+    return dd->control->textCursor();
+}
+
+class QGraphicsSimpleTextItemPrivate : public QAbstractGraphicsShapeItemPrivate
+{
+    Q_DECLARE_PUBLIC(QGraphicsSimpleTextItem)
+public:
+    inline QGraphicsSimpleTextItemPrivate() {
+        pen.setStyle(Qt::NoPen);
+        brush.setStyle(Qt::SolidPattern);
+    }
+    QString text;
+    QFont font;
+    QRectF boundingRect;
+
+    void updateBoundingRect();
+};
+
+static QRectF setupTextLayout(QTextLayout *layout)
+{
+    layout->setCacheEnabled(true);
+    layout->beginLayout();
+    while (layout->createLine().isValid())
+        ;
+    layout->endLayout();
+    qreal maxWidth = 0;
+    qreal y = 0;
+    for (int i = 0; i < layout->lineCount(); ++i) {
+        QTextLine line = layout->lineAt(i);
+        maxWidth = qMax(maxWidth, line.naturalTextWidth());
+        line.setPosition(QPointF(0, y));
+        y += line.height();
+    }
+    return QRectF(0, 0, maxWidth, y);
+}
+
+void QGraphicsSimpleTextItemPrivate::updateBoundingRect()
+{
+    Q_Q(QGraphicsSimpleTextItem);
+    QRectF br;
+    if (text.isEmpty()) {
+        br = QRectF();
+    } else {
+        QString tmp = text;
+        tmp.replace(QLatin1Char('\n'), QChar::LineSeparator);
+        QStackTextEngine engine(tmp, font);
+        QTextLayout layout(&engine);
+        br = setupTextLayout(&layout);
+    }
+    if (br != boundingRect) {
+        q->prepareGeometryChange();
+        boundingRect = br;
+        q->update();
+    }
+}
+
+/*!
+    \class QGraphicsSimpleTextItem
+    \brief The QGraphicsSimpleTextItem class provides a simple text path item
+    that you can add to a QGraphicsScene.
+    \since 4.2
+    \ingroup multimedia
+    \ingroup graphicsview-api
+
+    To set the item's text, you can either pass a QString to
+    QGraphicsSimpleTextItem's constructor, or call setText() to change the
+    text later. To set the text fill color, call setBrush().
+
+    The simple text item can have both a fill and an outline; setBrush() will
+    set the text fill (i.e., text color), and setPen() sets the pen that will
+    be used to draw the text outline. (The latter can be slow, especially for
+    complex pens, and items with long text content.) If all you want is to
+    draw a simple line of text, you should call setBrush() only, and leave the
+    pen unset; QGraphicsSimpleTextItem's pen is by default Qt::NoPen.
+
+    QGraphicsSimpleTextItem uses the text's formatted size and the associated
+    font to provide a reasonable implementation of boundingRect(), shape(),
+    and contains(). You can set the font by calling setFont().
+
+    QGraphicsSimpleText does not display rich text; instead, you can use
+    QGraphicsTextItem, which provides full text control capabilities.
+
+    \img graphicsview-simpletextitem.png
+
+    \sa QGraphicsTextItem, QGraphicsPathItem, QGraphicsRectItem, QGraphicsEllipseItem,
+    QGraphicsPixmapItem, QGraphicsPolygonItem, QGraphicsLineItem, {The
+    Graphics View Framework}
+*/
+
+/*!
+    Constructs a QGraphicsSimpleTextItem.
+
+    \a parent is passed to QGraphicsItem's constructor.
+
+    \sa QGraphicsScene::addItem()
+*/
+QGraphicsSimpleTextItem::QGraphicsSimpleTextItem(QGraphicsItem *parent
+#ifndef Q_QDOC
+                                                 // obsolete argument
+                                                 , QGraphicsScene *scene
+#endif
+    )
+    : QAbstractGraphicsShapeItem(*new QGraphicsSimpleTextItemPrivate, parent, scene)
+{
+}
+
+/*!
+    Constructs a QGraphicsSimpleTextItem, using \a text as the default plain text.
+
+    \a parent is passed to QGraphicsItem's constructor.
+
+    \sa QGraphicsScene::addItem()
+*/
+QGraphicsSimpleTextItem::QGraphicsSimpleTextItem(const QString &text, QGraphicsItem *parent
+#ifndef Q_QDOC
+                                                 // obsolete argument
+                                                 , QGraphicsScene *scene
+#endif
+    )
+    : QAbstractGraphicsShapeItem(*new QGraphicsSimpleTextItemPrivate, parent, scene)
+{
+    setText(text);
+}
+
+/*!
+    Destroys the QGraphicsSimpleTextItem.
+*/
+QGraphicsSimpleTextItem::~QGraphicsSimpleTextItem()
+{
+}
+
+/*!
+    Sets the item's text to \a text. The text will be displayed as
+    plain text. Newline characters ('\n') as well as characters of
+    type QChar::LineSeparator will cause item to break the text into
+    multiple lines.
+*/
+void QGraphicsSimpleTextItem::setText(const QString &text)
+{
+    Q_D(QGraphicsSimpleTextItem);
+    if (d->text == text)
+        return;
+    d->text = text;
+    d->updateBoundingRect();
+}
+
+/*!
+    Returns the item's text.
+*/
+QString QGraphicsSimpleTextItem::text() const
+{
+    Q_D(const QGraphicsSimpleTextItem);
+    return d->text;
+}
+
+/*!
+    Sets the font that is used to draw the item's text to \a font.
+*/
+void QGraphicsSimpleTextItem::setFont(const QFont &font)
+{
+    Q_D(QGraphicsSimpleTextItem);
+    d->font = font;
+    d->updateBoundingRect();
+}
+
+/*!
+    Returns the font that is used to draw the item's text.
+*/
+QFont QGraphicsSimpleTextItem::font() const
+{
+    Q_D(const QGraphicsSimpleTextItem);
+    return d->font;
+}
+
+/*!
+    \reimp
+*/
+QRectF QGraphicsSimpleTextItem::boundingRect() const
+{
+    Q_D(const QGraphicsSimpleTextItem);
+    return d->boundingRect;
+}
+
+/*!
+    \reimp
+*/
+QPainterPath QGraphicsSimpleTextItem::shape() const
+{
+    Q_D(const QGraphicsSimpleTextItem);
+    QPainterPath path;
+    path.addRect(d->boundingRect);
+    return path;
+}
+
+/*!
+    \reimp
+*/
+bool QGraphicsSimpleTextItem::contains(const QPointF &point) const
+{
+    Q_D(const QGraphicsSimpleTextItem);
+    return d->boundingRect.contains(point);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsSimpleTextItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
+{
+    Q_UNUSED(widget);
+    Q_D(QGraphicsSimpleTextItem);
+
+    painter->setFont(d->font);
+
+    QString tmp = d->text;
+    tmp.replace(QLatin1Char('\n'), QChar::LineSeparator);
+    QStackTextEngine engine(tmp, d->font);
+    QTextLayout layout(&engine);
+    setupTextLayout(&layout);
+
+    QPen p;
+    p.setBrush(d->brush);
+    painter->setPen(p);
+    if (d->pen.style() == Qt::NoPen && d->brush.style() == Qt::SolidPattern) {
+        painter->setBrush(Qt::NoBrush);
+    } else {
+        QTextLayout::FormatRange range;
+        range.start = 0;
+        range.length = layout.text().length();
+        range.format.setTextOutline(d->pen);
+        QList<QTextLayout::FormatRange> formats;
+        formats.append(range);
+        layout.setAdditionalFormats(formats);
+    }
+
+    layout.draw(painter, QPointF(0, 0));
+
+    if (option->state & (QStyle::State_Selected | QStyle::State_HasFocus))
+        qt_graphicsItem_highlightSelected(this, painter, option);
+}
+
+/*!
+    \reimp
+*/
+bool QGraphicsSimpleTextItem::isObscuredBy(const QGraphicsItem *item) const
+{
+    return QAbstractGraphicsShapeItem::isObscuredBy(item);
+}
+
+/*!
+    \reimp
+*/
+QPainterPath QGraphicsSimpleTextItem::opaqueArea() const
+{
+    return QAbstractGraphicsShapeItem::opaqueArea();
+}
+
+/*!
+    \reimp
+*/
+int QGraphicsSimpleTextItem::type() const
+{
+    return Type;
+}
+
+/*!
+    \internal
+*/
+bool QGraphicsSimpleTextItem::supportsExtension(Extension extension) const
+{
+    Q_UNUSED(extension);
+    return false;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsSimpleTextItem::setExtension(Extension extension, const QVariant &variant)
+{
+    Q_UNUSED(extension);
+    Q_UNUSED(variant);
+}
+
+/*!
+    \internal
+*/
+QVariant QGraphicsSimpleTextItem::extension(const QVariant &variant) const
+{
+    Q_UNUSED(variant);
+    return QVariant();
+}
+
+/*!
+    \class QGraphicsItemGroup
+    \brief The QGraphicsItemGroup class provides treating a group of items as
+    one.
+    \since 4.2
+    \ingroup multimedia
+    \ingroup graphicsview-api
+
+    A QGraphicsItemGroup is a special type of compound item that
+    treats itself and all its children as one item (i.e., all events
+    and geometries for all children are merged together). It's common
+    to use item groups in presentation tools, when the user wants to
+    group several smaller items into one big item in order to simplify
+    moving and copying of items.
+
+    If all you want is to store items inside other items, you can use
+    any QGraphicsItem directly by passing a suitable parent to
+    setParentItem().
+
+    The boundingRect() function of QGraphicsItemGroup returns the
+    bounding rectangle of all items in the item group. In addition,
+    item groups have handlesChildEvents() enabled by default, so all
+    events sent to a member of the group go to the item group (i.e.,
+    selecting one item in a group will select them all).
+    QGraphicsItemGroup ignores the ItemIgnoresTransformations flag on its
+    children (i.e., with respect to the geometry of the group item, the
+    children are treated as if they were transformable).
+
+    There are two ways to construct an item group. The easiest and
+    most common approach is to pass a list of items (e.g., all
+    selected items) to QGraphicsScene::createItemGroup(), which
+    returns a new QGraphicsItemGroup item. The other approach is to
+    manually construct a QGraphicsItemGroup item, add it to the scene
+    calling QGraphicsScene::addItem(), and then add items to the group
+    manually, one at a time by calling addToGroup(). To dismantle
+    ("ungroup") an item group, you can either call
+    QGraphicsScene::destroyItemGroup(), or you can manually remove all
+    items from the group by calling removeFromGroup().
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsitem.cpp 17
+
+    The operation of adding and removing items preserves the items'
+    scene-relative position and transformation, as opposed to calling
+    setParentItem(), where only the child item's parent-relative
+    position and transformation are kept.
+
+    The addtoGroup() function reparents the target item to this item
+    group, keeping the item's position and transformation intact
+    relative to the scene. Visually, this means that items added via
+    addToGroup() will remain completely unchanged as a result of this
+    operation, regardless of the item or the group's current position
+    or transformation; although the item's position and matrix are
+    likely to change.
+
+    The removeFromGroup() function has similar semantics to
+    setParentItem(); it reparents the item to the parent item of the
+    item group. As with addToGroup(), the item's scene-relative
+    position and transformation remain intact.
+
+    \sa QGraphicsItem, {The Graphics View Framework}
+*/
+
+class QGraphicsItemGroupPrivate : public QGraphicsItemPrivate
+{
+public:
+    QRectF itemsBoundingRect;
+};
+
+/*!
+    Constructs a QGraphicsItemGroup. \a parent is passed to QGraphicsItem's
+    constructor.
+
+    \sa QGraphicsScene::addItem()
+*/
+QGraphicsItemGroup::QGraphicsItemGroup(QGraphicsItem *parent
+#ifndef Q_QDOC
+                                       // obsolete argument
+                                       , QGraphicsScene *scene
+#endif
+    )
+    : QGraphicsItem(*new QGraphicsItemGroupPrivate, parent, scene)
+{
+    setHandlesChildEvents(true);
+}
+
+/*!
+    Destroys the QGraphicsItemGroup.
+*/
+QGraphicsItemGroup::~QGraphicsItemGroup()
+{
+}
+
+/*!
+    Adds the given \a item to this item group. The item will be
+    reparented to this group, but its position and transformation
+    relative to the scene will stay intact.
+
+    \sa removeFromGroup(), QGraphicsScene::createItemGroup()
+*/
+void QGraphicsItemGroup::addToGroup(QGraphicsItem *item)
+{
+    Q_D(QGraphicsItemGroup);
+    if (!item) {
+        qWarning("QGraphicsItemGroup::addToGroup: cannot add null item");
+        return;
+    }
+    if (item == this) {
+        qWarning("QGraphicsItemGroup::addToGroup: cannot add a group to itself");
+        return;
+    }
+
+    QTransform oldSceneMatrix = item->sceneTransform();
+    item->setPos(mapFromItem(item, 0, 0));
+    item->setParentItem(this);
+    item->setTransform(oldSceneMatrix
+                       * sceneTransform().inverted()
+                       * QTransform::fromTranslate(-item->x(), -item->y()));
+    item->d_func()->setIsMemberOfGroup(true);
+    prepareGeometryChange();
+    d->itemsBoundingRect |= (item->transform() * QTransform::fromTranslate(item->x(), item->y()))
+                            .mapRect(item->boundingRect() | item->childrenBoundingRect());
+    update();
+}
+
+/*!
+    Removes the specified \a item from this group. The item will be
+    reparented to this group's parent item, or to 0 if this group has
+    no parent.  Its position and transformation relative to the scene
+    will stay intact.
+
+    \sa addToGroup(), QGraphicsScene::destroyItemGroup()
+*/
+void QGraphicsItemGroup::removeFromGroup(QGraphicsItem *item)
+{
+    Q_D(QGraphicsItemGroup);
+    if (!item) {
+        qWarning("QGraphicsItemGroup::removeFromGroup: cannot remove null item");
+        return;
+    }
+
+    QGraphicsItem *newParent = d_ptr->parent;
+    QPointF oldPos = item->mapToItem(newParent, 0, 0);
+    item->setParentItem(newParent);
+    // ### This function should remap the item's matrix to keep the item's
+    // transformation unchanged relative to the scene.
+    item->setPos(oldPos);
+    item->d_func()->setIsMemberOfGroup(item->group() != 0);
+
+    // ### Quite expensive. But removeFromGroup() isn't called very often.
+    prepareGeometryChange();
+    d->itemsBoundingRect = childrenBoundingRect();
+}
+
+/*!
+    \reimp
+
+    Returns the bounding rect of this group item, and all its children.
+*/
+QRectF QGraphicsItemGroup::boundingRect() const
+{
+    Q_D(const QGraphicsItemGroup);
+    return d->itemsBoundingRect;
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsItemGroup::paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
+                               QWidget *widget)
+{
+    Q_UNUSED(widget);
+    if (option->state & QStyle::State_Selected) {
+        Q_D(QGraphicsItemGroup);
+        painter->setBrush(Qt::NoBrush);
+        painter->drawRect(d->itemsBoundingRect);
+    }
+}
+
+/*!
+    \reimp
+*/
+bool QGraphicsItemGroup::isObscuredBy(const QGraphicsItem *item) const
+{
+    return QGraphicsItem::isObscuredBy(item);
+}
+
+/*!
+    \reimp
+*/
+QPainterPath QGraphicsItemGroup::opaqueArea() const
+{
+    return QGraphicsItem::opaqueArea();
+}
+
+/*!
+    \reimp
+*/
+int QGraphicsItemGroup::type() const
+{
+    return Type;
+}
+
+#ifndef QT_NO_DEBUG_STREAM
+QDebug operator<<(QDebug debug, QGraphicsItem *item)
+{
+    if (!item) {
+        debug << "QGraphicsItem(0)";
+        return debug;
+    }
+
+    QStringList flags;
+    if (item->isVisible()) flags << QLatin1String("isVisible");
+    if (item->isEnabled()) flags << QLatin1String("isEnabled");
+    if (item->isSelected()) flags << QLatin1String("isSelected");
+    if (item->hasFocus()) flags << QLatin1String("HasFocus");
+
+    debug << "QGraphicsItem(this =" << ((void*)item)
+          << ", parent =" << ((void*)item->parentItem())
+          << ", pos =" << item->pos()
+          << ", z =" << item->zValue() << ", flags = {"
+          << flags.join(QLatin1String("|")) << " })";
+    return debug;
+}
+
+QDebug operator<<(QDebug debug, QGraphicsItem::GraphicsItemChange change)
+{
+    const char *str = "UnknownChange";
+    switch (change) {
+    case QGraphicsItem::ItemChildAddedChange:
+        str = "ItemChildAddedChange";
+        break;
+    case QGraphicsItem::ItemChildRemovedChange:
+        str = "ItemChildRemovedChange";
+        break;
+    case QGraphicsItem::ItemCursorChange:
+        str = "ItemCursorChange";
+        break;
+    case QGraphicsItem::ItemCursorHasChanged:
+        str = "ItemCursorHasChanged";
+        break;
+    case QGraphicsItem::ItemEnabledChange:
+        str = "ItemEnabledChange";
+        break;
+    case QGraphicsItem::ItemEnabledHasChanged:
+        str = "ItemEnabledHasChanged";
+        break;
+    case QGraphicsItem::ItemFlagsChange:
+        str = "ItemFlagsChange";
+        break;
+    case QGraphicsItem::ItemFlagsHaveChanged:
+        str = "ItemFlagsHaveChanged";
+        break;
+    case QGraphicsItem::ItemMatrixChange:
+        str = "ItemMatrixChange";
+        break;
+    case QGraphicsItem::ItemParentChange:
+        str = "ItemParentChange";
+        break;
+    case QGraphicsItem::ItemParentHasChanged:
+        str = "ItemParentHasChanged";
+        break;
+    case QGraphicsItem::ItemPositionChange:
+        str = "ItemPositionChange";
+        break;
+    case QGraphicsItem::ItemPositionHasChanged:
+        str = "ItemPositionHasChanged";
+        break;
+    case QGraphicsItem::ItemSceneChange:
+        str = "ItemSceneChange";
+        break;
+    case QGraphicsItem::ItemSceneHasChanged:
+        str = "ItemSceneHasChanged";
+        break;
+    case QGraphicsItem::ItemSelectedChange:
+        str = "ItemSelectedChange";
+        break;
+    case QGraphicsItem::ItemSelectedHasChanged:
+        str = "ItemSelectedHasChanged";
+        break;
+    case QGraphicsItem::ItemToolTipChange:
+        str = "ItemToolTipChange";
+        break;
+    case QGraphicsItem::ItemToolTipHasChanged:
+        str = "ItemToolTipHasChanged";
+        break;
+    case QGraphicsItem::ItemTransformChange:
+        str = "ItemTransformChange";
+        break;
+    case QGraphicsItem::ItemTransformHasChanged:
+        str = "ItemTransformHasChanged";
+        break;
+    case QGraphicsItem::ItemVisibleChange:
+        str = "ItemVisibleChange";
+        break;
+    case QGraphicsItem::ItemVisibleHasChanged:
+        str = "ItemVisibleHasChanged";
+        break;
+    case QGraphicsItem::ItemZValueChange:
+        str = "ItemZValueChange";
+        break;
+    case QGraphicsItem::ItemZValueHasChanged:
+        str = "ItemZValueHasChanged";
+        break;
+    case QGraphicsItem::ItemOpacityChange:
+        str = "ItemOpacityChange";
+        break;
+    case QGraphicsItem::ItemOpacityHasChanged:
+        str = "ItemOpacityHasChanged";
+        break;
+    }
+    debug << str;
+    return debug;
+}
+
+QDebug operator<<(QDebug debug, QGraphicsItem::GraphicsItemFlag flag)
+{
+    const char *str = "UnknownFlag";
+    switch (flag) {
+    case QGraphicsItem::ItemIsMovable:
+        str = "ItemIsMovable";
+        break;
+    case QGraphicsItem::ItemIsSelectable:
+        str = "ItemIsSelectable";
+        break;
+    case QGraphicsItem::ItemIsFocusable:
+        str = "ItemIsFocusable";
+        break;
+    case QGraphicsItem::ItemClipsToShape:
+        str = "ItemClipsToShape";
+        break;
+    case QGraphicsItem::ItemClipsChildrenToShape:
+        str = "ItemClipsChildrenToShape";
+        break;
+    case QGraphicsItem::ItemIgnoresTransformations:
+        str = "ItemIgnoresTransformations";
+        break;
+    case QGraphicsItem::ItemIgnoresParentOpacity:
+        str = "ItemIgnoresParentOpacity";
+        break;
+    case QGraphicsItem::ItemDoesntPropagateOpacityToChildren:
+        str = "ItemDoesntPropagateOpacityToChildren";
+        break;
+    case QGraphicsItem::ItemStacksBehindParent:
+        str = "ItemStacksBehindParent";
+        break;
+    }
+    debug << str;
+    return debug;
+}
+
+QDebug operator<<(QDebug debug, QGraphicsItem::GraphicsItemFlags flags)
+{
+    debug << "(";
+    bool f = false;
+    for (int i = 0; i < 9; ++i) {
+        if (flags & (1 << i)) {
+            if (f)
+                debug << "|";
+            f = true;
+            debug << QGraphicsItem::GraphicsItemFlag(int(flags & (1 << i)));
+        }
+    }
+    debug << ")";
+    return debug;
+}
+
+#endif
+
+QT_END_NAMESPACE
+
+#include "moc_qgraphicsitem.cpp"
+
+#endif // QT_NO_GRAPHICSVIEW
diff --git a/src/gui/graphicsview/qgraphicsitem.h b/src/gui/graphicsview/qgraphicsitem.h
new file mode 100644
index 0000000..1fce3db
--- /dev/null
+++ b/src/gui/graphicsview/qgraphicsitem.h
@@ -0,0 +1,1032 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QGRAPHICSITEM_H
+#define QGRAPHICSITEM_H
+
+#include <QtCore/qglobal.h>
+#include <QtCore/qobject.h>
+#include <QtCore/qvariant.h>
+#include <QtCore/qrect.h>
+#include <QtGui/qpainterpath.h>
+#include <QtGui/qpixmap.h>
+
+class tst_QGraphicsItem;
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Gui)
+
+#if !defined(QT_NO_GRAPHICSVIEW) || (QT_EDITION & QT_MODULE_GRAPHICSVIEW) != QT_MODULE_GRAPHICSVIEW
+
+class QBrush;
+class QCursor;
+class QFocusEvent;
+class QGraphicsItemGroup;
+class QGraphicsSceneContextMenuEvent;
+class QGraphicsSceneDragDropEvent;
+class QGraphicsSceneEvent;
+class QGraphicsSceneHoverEvent;
+class QGraphicsSceneMouseEvent;
+class QGraphicsSceneWheelEvent;
+class QGraphicsScene;
+class QGraphicsWidget;
+class QInputMethodEvent;
+class QKeyEvent;
+class QMatrix;
+class QMenu;
+class QPainter;
+class QPen;
+class QPointF;
+class QRectF;
+class QStyleOptionGraphicsItem;
+
+class QGraphicsItemPrivate;
+class Q_GUI_EXPORT QGraphicsItem
+{
+public:
+    enum GraphicsItemFlag {
+        ItemIsMovable = 0x1,
+        ItemIsSelectable = 0x2,
+        ItemIsFocusable = 0x4,
+        ItemClipsToShape = 0x8,
+        ItemClipsChildrenToShape = 0x10,
+        ItemIgnoresTransformations = 0x20,
+        ItemIgnoresParentOpacity = 0x40,
+        ItemDoesntPropagateOpacityToChildren = 0x80,
+        ItemStacksBehindParent = 0x100
+    };
+    Q_DECLARE_FLAGS(GraphicsItemFlags, GraphicsItemFlag)
+
+    enum GraphicsItemChange {
+        ItemPositionChange,
+        ItemMatrixChange,
+        ItemVisibleChange,
+        ItemEnabledChange,
+        ItemSelectedChange,
+        ItemParentChange,
+        ItemChildAddedChange,
+        ItemChildRemovedChange,
+        ItemTransformChange,
+        ItemPositionHasChanged,
+        ItemTransformHasChanged,
+        ItemSceneChange,
+        ItemVisibleHasChanged,
+        ItemEnabledHasChanged,
+        ItemSelectedHasChanged,
+        ItemParentHasChanged,
+        ItemSceneHasChanged,
+        ItemCursorChange,
+        ItemCursorHasChanged,
+        ItemToolTipChange,
+        ItemToolTipHasChanged,
+        ItemFlagsChange,
+        ItemFlagsHaveChanged,
+        ItemZValueChange,
+        ItemZValueHasChanged,
+        ItemOpacityChange,
+        ItemOpacityHasChanged
+    };
+
+    enum CacheMode {
+        NoCache,
+        ItemCoordinateCache,
+        DeviceCoordinateCache
+    };
+
+    QGraphicsItem(QGraphicsItem *parent = 0
+#ifndef Q_QDOC
+                  // obsolete argument
+                  , QGraphicsScene *scene = 0
+#endif
+        );
+    virtual ~QGraphicsItem();
+
+    QGraphicsScene *scene() const;
+
+    QGraphicsItem *parentItem() const;
+    QGraphicsItem *topLevelItem() const;
+    QGraphicsWidget *parentWidget() const;
+    QGraphicsWidget *topLevelWidget() const;
+    QGraphicsWidget *window() const;
+    void setParentItem(QGraphicsItem *parent);
+    QList<QGraphicsItem *> children() const; // ### obsolete
+    QList<QGraphicsItem *> childItems() const;
+    bool isWidget() const;
+    bool isWindow() const;
+
+    QGraphicsItemGroup *group() const;
+    void setGroup(QGraphicsItemGroup *group);
+
+    GraphicsItemFlags flags() const;
+    void setFlag(GraphicsItemFlag flag, bool enabled = true);
+    void setFlags(GraphicsItemFlags flags);
+
+    CacheMode cacheMode() const;
+    void setCacheMode(CacheMode mode, const QSize &cacheSize = QSize());
+
+#ifndef QT_NO_TOOLTIP
+    QString toolTip() const;
+    void setToolTip(const QString &toolTip);
+#endif
+
+#ifndef QT_NO_CURSOR
+    QCursor cursor() const;
+    void setCursor(const QCursor &cursor);
+    bool hasCursor() const;
+    void unsetCursor();
+#endif
+
+    bool isVisible() const;
+    bool isVisibleTo(const QGraphicsItem *parent) const;
+    void setVisible(bool visible);
+    inline void hide() { setVisible(false); }
+    inline void show() { setVisible(true); }
+
+    bool isEnabled() const;
+    void setEnabled(bool enabled);
+
+    bool isSelected() const;
+    void setSelected(bool selected);
+
+    bool acceptDrops() const;
+    void setAcceptDrops(bool on);
+
+    qreal opacity() const;
+    qreal effectiveOpacity() const;
+    void setOpacity(qreal opacity);
+
+    Qt::MouseButtons acceptedMouseButtons() const;
+    void setAcceptedMouseButtons(Qt::MouseButtons buttons);
+
+    bool acceptsHoverEvents() const; // obsolete
+    void setAcceptsHoverEvents(bool enabled); // obsolete
+    bool acceptHoverEvents() const;
+    void setAcceptHoverEvents(bool enabled);
+
+    bool handlesChildEvents() const;
+    void setHandlesChildEvents(bool enabled);
+
+    bool hasFocus() const;
+    void setFocus(Qt::FocusReason focusReason = Qt::OtherFocusReason);
+    void clearFocus();
+
+    void grabMouse();
+    void ungrabMouse();
+    void grabKeyboard();
+    void ungrabKeyboard();
+
+    // Positioning in scene coordinates
+    QPointF pos() const;
+    inline qreal x() const { return pos().x(); }
+    inline qreal y() const { return pos().y(); }
+    QPointF scenePos() const;
+    void setPos(const QPointF &pos);
+    inline void setPos(qreal x, qreal y);
+    inline void moveBy(qreal dx, qreal dy) { setPos(pos().x() + dx, pos().y() + dy); }
+
+    void ensureVisible(const QRectF &rect = QRectF(), int xmargin = 50, int ymargin = 50);
+    inline void ensureVisible(qreal x, qreal y, qreal w, qreal h, int xmargin = 50, int ymargin = 50);
+
+    // Local transformation
+    QMatrix matrix() const;
+    QMatrix sceneMatrix() const;
+    void setMatrix(const QMatrix &matrix, bool combine = false);
+    void resetMatrix();
+    QTransform transform() const;
+    QTransform sceneTransform() const;
+    QTransform deviceTransform(const QTransform &viewportTransform) const;
+    QTransform itemTransform(const QGraphicsItem *other, bool *ok = 0) const;
+    void setTransform(const QTransform &matrix, bool combine = false);
+    void resetTransform();
+
+    // ### obsolete?
+    void rotate(qreal angle);
+    void scale(qreal sx, qreal sy);
+    void shear(qreal sh, qreal sv);
+    void translate(qreal dx, qreal dy);
+
+    // ### experimental
+    QPointF transformOrigin() const;
+    void setTransformOrigin(const QPointF &center);
+    qreal xScale() const;
+    void setXScale(qreal factor);
+    qreal yScale() const;
+    void setYScale(qreal factor);
+    qreal xRotation() const;
+    void setXRotation(qreal angle);
+    qreal yRotation() const;
+    void setYRotation(qreal angle);
+    qreal zRotation() const;
+    void setZRotation(qreal angle);
+
+    virtual void advance(int phase);
+
+    // Stacking order
+    qreal zValue() const;
+    void setZValue(qreal z);
+
+    // Hit test
+    virtual QRectF boundingRect() const = 0;
+    QRectF childrenBoundingRect() const;
+    QRectF sceneBoundingRect() const;
+    virtual QPainterPath shape() const;
+    bool isClipped() const;
+    QPainterPath clipPath() const;
+    virtual bool contains(const QPointF &point) const;
+    virtual bool collidesWithItem(const QGraphicsItem *other, Qt::ItemSelectionMode mode = Qt::IntersectsItemShape) const;
+    virtual bool collidesWithPath(const QPainterPath &path, Qt::ItemSelectionMode mode = Qt::IntersectsItemShape) const;
+    QList<QGraphicsItem *> collidingItems(Qt::ItemSelectionMode mode = Qt::IntersectsItemShape) const;
+    bool isObscured() const;
+    bool isObscured(const QRectF &rect) const; // ### Qt 5: merge with isObscured(), add QRectF arg to isObscuredBy()
+    inline bool isObscured(qreal x, qreal y, qreal w, qreal h) const;
+    virtual bool isObscuredBy(const QGraphicsItem *item) const;
+    virtual QPainterPath opaqueArea() const;
+
+    QRegion boundingRegion(const QTransform &itemToDeviceTransform) const;
+    qreal boundingRegionGranularity() const;
+    void setBoundingRegionGranularity(qreal granularity);
+
+    // Drawing
+    virtual void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0) = 0;
+    void update(const QRectF &rect = QRectF());
+    inline void update(qreal x, qreal y, qreal width, qreal height);
+    void scroll(qreal dx, qreal dy, const QRectF &rect = QRectF());
+
+    // Coordinate mapping
+    QPointF mapToItem(const QGraphicsItem *item, const QPointF &point) const;
+    QPointF mapToParent(const QPointF &point) const;
+    QPointF mapToScene(const QPointF &point) const;
+    QPolygonF mapToItem(const QGraphicsItem *item, const QRectF &rect) const;
+    QPolygonF mapToParent(const QRectF &rect) const;
+    QPolygonF mapToScene(const QRectF &rect) const;
+    QRectF mapRectToItem(const QGraphicsItem *item, const QRectF &rect) const;
+    QRectF mapRectToParent(const QRectF &rect) const;
+    QRectF mapRectToScene(const QRectF &rect) const;
+    QPolygonF mapToItem(const QGraphicsItem *item, const QPolygonF &polygon) const;
+    QPolygonF mapToParent(const QPolygonF &polygon) const;
+    QPolygonF mapToScene(const QPolygonF &polygon) const;
+    QPainterPath mapToItem(const QGraphicsItem *item, const QPainterPath &path) const;
+    QPainterPath mapToParent(const QPainterPath &path) const;
+    QPainterPath mapToScene(const QPainterPath &path) const;
+    QPointF mapFromItem(const QGraphicsItem *item, const QPointF &point) const;
+    QPointF mapFromParent(const QPointF &point) const;
+    QPointF mapFromScene(const QPointF &point) const;
+    QPolygonF mapFromItem(const QGraphicsItem *item, const QRectF &rect) const;
+    QPolygonF mapFromParent(const QRectF &rect) const;
+    QPolygonF mapFromScene(const QRectF &rect) const;
+    QRectF mapRectFromItem(const QGraphicsItem *item, const QRectF &rect) const;
+    QRectF mapRectFromParent(const QRectF &rect) const;
+    QRectF mapRectFromScene(const QRectF &rect) const;
+    QPolygonF mapFromItem(const QGraphicsItem *item, const QPolygonF &polygon) const;
+    QPolygonF mapFromParent(const QPolygonF &polygon) const;
+    QPolygonF mapFromScene(const QPolygonF &polygon) const;
+    QPainterPath mapFromItem(const QGraphicsItem *item, const QPainterPath &path) const;
+    QPainterPath mapFromParent(const QPainterPath &path) const;
+    QPainterPath mapFromScene(const QPainterPath &path) const;
+
+    inline QPointF mapToItem(const QGraphicsItem *item, qreal x, qreal y) const;
+    inline QPointF mapToParent(qreal x, qreal y) const;
+    inline QPointF mapToScene(qreal x, qreal y) const;
+    inline QPolygonF mapToItem(const QGraphicsItem *item, qreal x, qreal y, qreal w, qreal h) const;
+    inline QPolygonF mapToParent(qreal x, qreal y, qreal w, qreal h) const;
+    inline QPolygonF mapToScene(qreal x, qreal y, qreal w, qreal h) const;
+    inline QRectF mapRectToItem(const QGraphicsItem *item, qreal x, qreal y, qreal w, qreal h) const;
+    inline QRectF mapRectToParent(qreal x, qreal y, qreal w, qreal h) const;
+    inline QRectF mapRectToScene(qreal x, qreal y, qreal w, qreal h) const;
+    inline QPointF mapFromItem(const QGraphicsItem *item, qreal x, qreal y) const;
+    inline QPointF mapFromParent(qreal x, qreal y) const;
+    inline QPointF mapFromScene(qreal x, qreal y) const;
+    inline QPolygonF mapFromItem(const QGraphicsItem *item, qreal x, qreal y, qreal w, qreal h) const;
+    inline QPolygonF mapFromParent(qreal x, qreal y, qreal w, qreal h) const;
+    inline QPolygonF mapFromScene(qreal x, qreal y, qreal w, qreal h) const;
+    inline QRectF mapRectFromItem(const QGraphicsItem *item, qreal x, qreal y, qreal w, qreal h) const;
+    inline QRectF mapRectFromParent(qreal x, qreal y, qreal w, qreal h) const;
+    inline QRectF mapRectFromScene(qreal x, qreal y, qreal w, qreal h) const;
+
+    bool isAncestorOf(const QGraphicsItem *child) const;
+    QGraphicsItem *commonAncestorItem(const QGraphicsItem *other) const;
+    bool isUnderMouse() const;
+
+    // Custom data
+    QVariant data(int key) const;
+    void setData(int key, const QVariant &value);
+
+    enum {
+        Type = 1,
+        UserType = 65536
+    };
+    virtual int type() const;
+
+    void installSceneEventFilter(QGraphicsItem *filterItem);
+    void removeSceneEventFilter(QGraphicsItem *filterItem);
+
+protected:
+    virtual bool sceneEventFilter(QGraphicsItem *watched, QEvent *event);
+    virtual bool sceneEvent(QEvent *event);
+    virtual void contextMenuEvent(QGraphicsSceneContextMenuEvent *event);
+    virtual void dragEnterEvent(QGraphicsSceneDragDropEvent *event);
+    virtual void dragLeaveEvent(QGraphicsSceneDragDropEvent *event);
+    virtual void dragMoveEvent(QGraphicsSceneDragDropEvent *event);
+    virtual void dropEvent(QGraphicsSceneDragDropEvent *event);
+    virtual void focusInEvent(QFocusEvent *event);
+    virtual void focusOutEvent(QFocusEvent *event);
+    virtual void hoverEnterEvent(QGraphicsSceneHoverEvent *event);
+    virtual void hoverMoveEvent(QGraphicsSceneHoverEvent *event);
+    virtual void hoverLeaveEvent(QGraphicsSceneHoverEvent *event);
+    virtual void keyPressEvent(QKeyEvent *event);
+    virtual void keyReleaseEvent(QKeyEvent *event);
+    virtual void mousePressEvent(QGraphicsSceneMouseEvent *event);
+    virtual void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
+    virtual void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
+    virtual void mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event);
+    virtual void wheelEvent(QGraphicsSceneWheelEvent *event);
+    virtual void inputMethodEvent(QInputMethodEvent *event);
+    virtual QVariant inputMethodQuery(Qt::InputMethodQuery query) const;
+
+    virtual QVariant itemChange(GraphicsItemChange change, const QVariant &value);
+
+    enum Extension {
+        UserExtension = 0x80000000
+    };
+    virtual bool supportsExtension(Extension extension) const;
+    virtual void setExtension(Extension extension, const QVariant &variant);
+    virtual QVariant extension(const QVariant &variant) const;
+
+protected:
+    QGraphicsItem(QGraphicsItemPrivate &dd,
+                  QGraphicsItem *parent, QGraphicsScene *scene);
+    QGraphicsItemPrivate *d_ptr;
+
+    void addToIndex();
+    void removeFromIndex();
+    void prepareGeometryChange();
+
+private:
+    Q_DISABLE_COPY(QGraphicsItem)
+    Q_DECLARE_PRIVATE(QGraphicsItem)
+    friend class QGraphicsItemGroup;
+    friend class QGraphicsScene;
+    friend class QGraphicsScenePrivate;
+    friend class QGraphicsSceneFindItemBspTreeVisitor;
+    friend class QGraphicsView;
+    friend class QGraphicsViewPrivate;
+    friend class QGraphicsWidget;
+    friend class QGraphicsWidgetPrivate;
+    friend class QGraphicsProxyWidgetPrivate;
+    friend class ::tst_QGraphicsItem;
+    friend bool qt_closestLeaf(const QGraphicsItem *, const QGraphicsItem *);
+    friend bool qt_closestItemFirst(const QGraphicsItem *, const QGraphicsItem *);
+};
+
+Q_DECLARE_OPERATORS_FOR_FLAGS(QGraphicsItem::GraphicsItemFlags)
+
+inline void QGraphicsItem::setPos(qreal ax, qreal ay)
+{ setPos(QPointF(ax, ay)); }
+inline void QGraphicsItem::ensureVisible(qreal ax, qreal ay, qreal w, qreal h, int xmargin, int ymargin)
+{ ensureVisible(QRectF(ax, ay, w, h), xmargin, ymargin); }
+inline void QGraphicsItem::update(qreal ax, qreal ay, qreal width, qreal height)
+{ update(QRectF(ax, ay, width, height)); }
+inline bool QGraphicsItem::isObscured(qreal ax, qreal ay, qreal w, qreal h) const
+{ return isObscured(QRectF(ax, ay, w, h)); }
+inline QPointF QGraphicsItem::mapToItem(const QGraphicsItem *item, qreal ax, qreal ay) const
+{ return mapToItem(item, QPointF(ax, ay)); }
+inline QPointF QGraphicsItem::mapToParent(qreal ax, qreal ay) const
+{ return mapToParent(QPointF(ax, ay)); }
+inline QPointF QGraphicsItem::mapToScene(qreal ax, qreal ay) const
+{ return mapToScene(QPointF(ax, ay));  }
+inline QPointF QGraphicsItem::mapFromItem(const QGraphicsItem *item, qreal ax, qreal ay) const
+{ return mapFromItem(item, QPointF(ax, ay)); }
+inline QPointF QGraphicsItem::mapFromParent(qreal ax, qreal ay) const
+{ return mapFromParent(QPointF(ax, ay));  }
+inline QPointF QGraphicsItem::mapFromScene(qreal ax, qreal ay) const
+{ return mapFromScene(QPointF(ax, ay));  }
+inline QPolygonF QGraphicsItem::mapToItem(const QGraphicsItem *item, qreal ax, qreal ay, qreal w, qreal h) const
+{ return mapToItem(item, QRectF(ax, ay, w, h)); }
+inline QPolygonF QGraphicsItem::mapToParent(qreal ax, qreal ay, qreal w, qreal h) const
+{ return mapToParent(QRectF(ax, ay, w, h)); }
+inline QPolygonF QGraphicsItem::mapToScene(qreal ax, qreal ay, qreal w, qreal h) const
+{ return mapToScene(QRectF(ax, ay, w, h)); }
+inline QRectF QGraphicsItem::mapRectToItem(const QGraphicsItem *item, qreal ax, qreal ay, qreal w, qreal h) const
+{ return mapRectToItem(item, QRectF(ax, ay, w, h)); }
+inline QRectF QGraphicsItem::mapRectToParent(qreal ax, qreal ay, qreal w, qreal h) const
+{ return mapRectToParent(QRectF(ax, ay, w, h)); }
+inline QRectF QGraphicsItem::mapRectToScene(qreal ax, qreal ay, qreal w, qreal h) const
+{ return mapRectToScene(QRectF(ax, ay, w, h)); }
+inline QPolygonF QGraphicsItem::mapFromItem(const QGraphicsItem *item, qreal ax, qreal ay, qreal w, qreal h) const
+{ return mapFromItem(item, QRectF(ax, ay, w, h)); }
+inline QPolygonF QGraphicsItem::mapFromParent(qreal ax, qreal ay, qreal w, qreal h) const
+{ return mapFromParent(QRectF(ax, ay, w, h)); }
+inline QPolygonF QGraphicsItem::mapFromScene(qreal ax, qreal ay, qreal w, qreal h) const
+{ return mapFromScene(QRectF(ax, ay, w, h)); }
+inline QRectF QGraphicsItem::mapRectFromItem(const QGraphicsItem *item, qreal ax, qreal ay, qreal w, qreal h) const
+{ return mapRectFromItem(item, QRectF(ax, ay, w, h)); }
+inline QRectF QGraphicsItem::mapRectFromParent(qreal ax, qreal ay, qreal w, qreal h) const
+{ return mapRectFromParent(QRectF(ax, ay, w, h)); }
+inline QRectF QGraphicsItem::mapRectFromScene(qreal ax, qreal ay, qreal w, qreal h) const
+{ return mapRectFromScene(QRectF(ax, ay, w, h)); }
+
+class QAbstractGraphicsShapeItemPrivate;
+class Q_GUI_EXPORT QAbstractGraphicsShapeItem : public QGraphicsItem
+{
+public:
+    QAbstractGraphicsShapeItem(QGraphicsItem *parent = 0
+#ifndef Q_QDOC
+                               // obsolete argument
+                               , QGraphicsScene *scene = 0
+#endif
+        );
+    ~QAbstractGraphicsShapeItem();
+
+    QPen pen() const;
+    void setPen(const QPen &pen);
+
+    QBrush brush() const;
+    void setBrush(const QBrush &brush);
+
+    bool isObscuredBy(const QGraphicsItem *item) const;
+    QPainterPath opaqueArea() const;
+
+protected:
+    QAbstractGraphicsShapeItem(QAbstractGraphicsShapeItemPrivate &dd,
+                               QGraphicsItem *parent, QGraphicsScene *scene);
+
+private:
+    Q_DISABLE_COPY(QAbstractGraphicsShapeItem)
+    Q_DECLARE_PRIVATE(QAbstractGraphicsShapeItem)
+};
+
+class QGraphicsPathItemPrivate;
+class Q_GUI_EXPORT QGraphicsPathItem : public QAbstractGraphicsShapeItem
+{
+public:
+    QGraphicsPathItem(QGraphicsItem *parent = 0
+#ifndef Q_QDOC
+                      // obsolete argument
+                      , QGraphicsScene *scene = 0
+#endif
+        );
+    QGraphicsPathItem(const QPainterPath &path, QGraphicsItem *parent = 0
+#ifndef Q_QDOC
+                      // obsolete argument
+                      , QGraphicsScene *scene = 0
+#endif
+        );
+    ~QGraphicsPathItem();
+
+    QPainterPath path() const;
+    void setPath(const QPainterPath &path);
+
+    QRectF boundingRect() const;
+    QPainterPath shape() const;
+    bool contains(const QPointF &point) const;
+
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0);
+
+    bool isObscuredBy(const QGraphicsItem *item) const;
+    QPainterPath opaqueArea() const;
+
+    enum { Type = 2 };
+    int type() const;
+
+protected:
+    bool supportsExtension(Extension extension) const;
+    void setExtension(Extension extension, const QVariant &variant);
+    QVariant extension(const QVariant &variant) const;
+
+private:
+    Q_DISABLE_COPY(QGraphicsPathItem)
+    Q_DECLARE_PRIVATE(QGraphicsPathItem)
+};
+
+class QGraphicsRectItemPrivate;
+class Q_GUI_EXPORT QGraphicsRectItem : public QAbstractGraphicsShapeItem
+{
+public:
+    QGraphicsRectItem(QGraphicsItem *parent = 0
+#ifndef Q_QDOC
+                      // obsolete argument
+                      , QGraphicsScene *scene = 0
+#endif
+        );
+    QGraphicsRectItem(const QRectF &rect, QGraphicsItem *parent = 0
+#ifndef Q_QDOC
+                      // obsolete argument
+                      , QGraphicsScene *scene = 0
+#endif
+        );
+    QGraphicsRectItem(qreal x, qreal y, qreal w, qreal h, QGraphicsItem *parent = 0
+#ifndef Q_QDOC
+                      // obsolete argument
+                      , QGraphicsScene *scene = 0
+#endif
+        );
+    ~QGraphicsRectItem();
+
+    QRectF rect() const;
+    void setRect(const QRectF &rect);
+    inline void setRect(qreal x, qreal y, qreal w, qreal h);
+
+    QRectF boundingRect() const;
+    QPainterPath shape() const;
+    bool contains(const QPointF &point) const;
+
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0);
+
+    bool isObscuredBy(const QGraphicsItem *item) const;
+    QPainterPath opaqueArea() const;
+
+    enum { Type = 3 };
+    int type() const;
+
+protected:
+    bool supportsExtension(Extension extension) const;
+    void setExtension(Extension extension, const QVariant &variant);
+    QVariant extension(const QVariant &variant) const;
+
+private:
+    Q_DISABLE_COPY(QGraphicsRectItem)
+    Q_DECLARE_PRIVATE(QGraphicsRectItem)
+};
+
+inline void QGraphicsRectItem::setRect(qreal ax, qreal ay, qreal w, qreal h)
+{ setRect(QRectF(ax, ay, w, h)); }
+
+class QGraphicsEllipseItemPrivate;
+class Q_GUI_EXPORT QGraphicsEllipseItem : public QAbstractGraphicsShapeItem
+{
+public:
+    QGraphicsEllipseItem(QGraphicsItem *parent = 0
+#ifndef Q_QDOC
+                         // obsolete argument
+                         , QGraphicsScene *scene = 0
+#endif
+        );
+    QGraphicsEllipseItem(const QRectF &rect, QGraphicsItem *parent = 0
+#ifndef Q_QDOC
+                         // obsolete argument
+                         , QGraphicsScene *scene = 0
+#endif
+        );
+    QGraphicsEllipseItem(qreal x, qreal y, qreal w, qreal h, QGraphicsItem *parent = 0
+#ifndef Q_QDOC
+                         // obsolete argument
+                         , QGraphicsScene *scene = 0
+#endif
+        );
+    ~QGraphicsEllipseItem();
+
+    QRectF rect() const;
+    void setRect(const QRectF &rect);
+    inline void setRect(qreal x, qreal y, qreal w, qreal h);
+
+    int startAngle() const;
+    void setStartAngle(int angle);
+
+    int spanAngle() const;
+    void setSpanAngle(int angle);
+
+    QRectF boundingRect() const;
+    QPainterPath shape() const;
+    bool contains(const QPointF &point) const;
+
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0);
+
+    bool isObscuredBy(const QGraphicsItem *item) const;
+    QPainterPath opaqueArea() const;
+
+    enum { Type = 4 };
+    int type() const;
+
+protected:
+    bool supportsExtension(Extension extension) const;
+    void setExtension(Extension extension, const QVariant &variant);
+    QVariant extension(const QVariant &variant) const;
+
+private:
+    Q_DISABLE_COPY(QGraphicsEllipseItem)
+    Q_DECLARE_PRIVATE(QGraphicsEllipseItem)
+};
+
+inline void QGraphicsEllipseItem::setRect(qreal ax, qreal ay, qreal w, qreal h)
+{ setRect(QRectF(ax, ay, w, h)); }
+
+class QGraphicsPolygonItemPrivate;
+class Q_GUI_EXPORT QGraphicsPolygonItem : public QAbstractGraphicsShapeItem
+{
+public:
+    QGraphicsPolygonItem(QGraphicsItem *parent = 0
+#ifndef Q_QDOC
+                         // obsolete argument
+                         , QGraphicsScene *scene = 0
+#endif
+        );
+    QGraphicsPolygonItem(const QPolygonF &polygon,
+                         QGraphicsItem *parent = 0
+#ifndef Q_QDOC
+                         // obsolete argument
+                         , QGraphicsScene *scene = 0
+#endif
+        );
+    ~QGraphicsPolygonItem();
+
+    QPolygonF polygon() const;
+    void setPolygon(const QPolygonF &polygon);
+
+    Qt::FillRule fillRule() const;
+    void setFillRule(Qt::FillRule rule);
+
+    QRectF boundingRect() const;
+    QPainterPath shape() const;
+    bool contains(const QPointF &point) const;
+
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0);
+
+    bool isObscuredBy(const QGraphicsItem *item) const;
+    QPainterPath opaqueArea() const;
+
+    enum { Type = 5 };
+    int type() const;
+
+protected:
+    bool supportsExtension(Extension extension) const;
+    void setExtension(Extension extension, const QVariant &variant);
+    QVariant extension(const QVariant &variant) const;
+
+private:
+    Q_DISABLE_COPY(QGraphicsPolygonItem)
+    Q_DECLARE_PRIVATE(QGraphicsPolygonItem)
+};
+
+class QGraphicsLineItemPrivate;
+class Q_GUI_EXPORT QGraphicsLineItem : public QGraphicsItem
+{
+public:
+    QGraphicsLineItem(QGraphicsItem *parent = 0
+#ifndef Q_QDOC
+                      // obsolete argument
+                      , QGraphicsScene *scene = 0
+#endif
+        );
+    QGraphicsLineItem(const QLineF &line, QGraphicsItem *parent = 0
+#ifndef Q_QDOC
+                      // obsolete argument
+                      , QGraphicsScene *scene = 0
+#endif
+        );
+    QGraphicsLineItem(qreal x1, qreal y1, qreal x2, qreal y2, QGraphicsItem *parent = 0
+#ifndef Q_QDOC
+                      // obsolete argument
+                      , QGraphicsScene *scene = 0
+#endif
+        );
+    ~QGraphicsLineItem();
+
+    QPen pen() const;
+    void setPen(const QPen &pen);
+
+    QLineF line() const;
+    void setLine(const QLineF &line);
+    inline void setLine(qreal x1, qreal y1, qreal x2, qreal y2)
+    { setLine(QLineF(x1, y1, x2, y2)); }
+
+    QRectF boundingRect() const;
+    QPainterPath shape() const;
+    bool contains(const QPointF &point) const;
+
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0);
+
+    bool isObscuredBy(const QGraphicsItem *item) const;
+    QPainterPath opaqueArea() const;
+
+    enum { Type = 6 };
+    int type() const;
+
+protected:
+    bool supportsExtension(Extension extension) const;
+    void setExtension(Extension extension, const QVariant &variant);
+    QVariant extension(const QVariant &variant) const;
+
+private:
+    Q_DISABLE_COPY(QGraphicsLineItem)
+    Q_DECLARE_PRIVATE(QGraphicsLineItem)
+};
+
+class QGraphicsPixmapItemPrivate;
+class Q_GUI_EXPORT QGraphicsPixmapItem : public QGraphicsItem
+{
+public:
+    enum ShapeMode {
+        MaskShape,
+        BoundingRectShape,
+        HeuristicMaskShape
+    };
+
+    QGraphicsPixmapItem(QGraphicsItem *parent = 0
+#ifndef Q_QDOC
+                        // obsolete argument
+                        , QGraphicsScene *scene = 0
+#endif
+        );
+    QGraphicsPixmapItem(const QPixmap &pixmap, QGraphicsItem *parent = 0
+#ifndef Q_QDOC
+                        // obsolete argument
+                        , QGraphicsScene *scene = 0
+#endif
+        );
+    ~QGraphicsPixmapItem();
+
+    QPixmap pixmap() const;
+    void setPixmap(const QPixmap &pixmap);
+
+    Qt::TransformationMode transformationMode() const;
+    void setTransformationMode(Qt::TransformationMode mode);
+
+    QPointF offset() const;
+    void setOffset(const QPointF &offset);
+    inline void setOffset(qreal x, qreal y);
+
+    QRectF boundingRect() const;
+    QPainterPath shape() const;
+    bool contains(const QPointF &point) const;
+
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
+
+    bool isObscuredBy(const QGraphicsItem *item) const;
+    QPainterPath opaqueArea() const;
+
+    enum { Type = 7 };
+    int type() const;
+
+    ShapeMode shapeMode() const;
+    void setShapeMode(ShapeMode mode);
+
+protected:
+    bool supportsExtension(Extension extension) const;
+    void setExtension(Extension extension, const QVariant &variant);
+    QVariant extension(const QVariant &variant) const;
+
+private:
+    Q_DISABLE_COPY(QGraphicsPixmapItem)
+    Q_DECLARE_PRIVATE(QGraphicsPixmapItem)
+};
+
+inline void QGraphicsPixmapItem::setOffset(qreal ax, qreal ay)
+{ setOffset(QPointF(ax, ay)); }
+
+class QGraphicsTextItemPrivate;
+class QTextDocument;
+class QTextCursor;
+class Q_GUI_EXPORT QGraphicsTextItem : public QObject, public QGraphicsItem
+{
+    Q_OBJECT
+    QDOC_PROPERTY(bool openExternalLinks READ openExternalLinks WRITE setOpenExternalLinks)
+    QDOC_PROPERTY(QTextCursor textCursor READ textCursor WRITE setTextCursor)
+
+public:
+    QGraphicsTextItem(QGraphicsItem *parent = 0
+#ifndef Q_QDOC
+                      // obsolete argument
+                      , QGraphicsScene *scene = 0
+#endif
+        );
+    QGraphicsTextItem(const QString &text, QGraphicsItem *parent = 0
+#ifndef Q_QDOC
+                      // obsolete argument
+                      , QGraphicsScene *scene = 0
+#endif
+        );
+    ~QGraphicsTextItem();
+
+    QString toHtml() const;
+    void setHtml(const QString &html);
+
+    QString toPlainText() const;
+    void setPlainText(const QString &text);
+
+    QFont font() const;
+    void setFont(const QFont &font);
+
+    void setDefaultTextColor(const QColor &c);
+    QColor defaultTextColor() const;
+
+    QRectF boundingRect() const;
+    QPainterPath shape() const;
+    bool contains(const QPointF &point) const;
+
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
+
+    bool isObscuredBy(const QGraphicsItem *item) const;
+    QPainterPath opaqueArea() const;
+
+    enum { Type = 8 };
+    int type() const;
+
+    void setTextWidth(qreal width);
+    qreal textWidth() const;
+
+    void adjustSize();
+
+    void setDocument(QTextDocument *document);
+    QTextDocument *document() const;
+
+    void setTextInteractionFlags(Qt::TextInteractionFlags flags);
+    Qt::TextInteractionFlags textInteractionFlags() const;
+
+    void setTabChangesFocus(bool b);
+    bool tabChangesFocus() const;
+
+    void setOpenExternalLinks(bool open);
+    bool openExternalLinks() const;
+
+    void setTextCursor(const QTextCursor &cursor);
+    QTextCursor textCursor() const;
+
+Q_SIGNALS:
+    void linkActivated(const QString &);
+    void linkHovered(const QString &);
+
+protected:
+    bool sceneEvent(QEvent *event);
+    void mousePressEvent(QGraphicsSceneMouseEvent *event);
+    void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
+    void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
+    void mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event);
+    void contextMenuEvent(QGraphicsSceneContextMenuEvent *event);
+    void keyPressEvent(QKeyEvent *event);
+    void keyReleaseEvent(QKeyEvent *event);
+    void focusInEvent(QFocusEvent *event);
+    void focusOutEvent(QFocusEvent *event);
+    void dragEnterEvent(QGraphicsSceneDragDropEvent *event);
+    void dragLeaveEvent(QGraphicsSceneDragDropEvent *event);
+    void dragMoveEvent(QGraphicsSceneDragDropEvent *event);
+    void dropEvent(QGraphicsSceneDragDropEvent *event);
+    void inputMethodEvent(QInputMethodEvent *event);
+    void hoverEnterEvent(QGraphicsSceneHoverEvent *event);
+    void hoverMoveEvent(QGraphicsSceneHoverEvent *event);
+    void hoverLeaveEvent(QGraphicsSceneHoverEvent *event);
+
+    QVariant inputMethodQuery(Qt::InputMethodQuery query) const;
+
+    bool supportsExtension(Extension extension) const;
+    void setExtension(Extension extension, const QVariant &variant);
+    QVariant extension(const QVariant &variant) const;
+
+private:
+    Q_DISABLE_COPY(QGraphicsTextItem)
+    Q_PRIVATE_SLOT(dd, void _q_updateBoundingRect(const QSizeF &))
+    Q_PRIVATE_SLOT(dd, void _q_update(QRectF))
+    Q_PRIVATE_SLOT(dd, void _q_ensureVisible(QRectF))
+    QGraphicsTextItemPrivate *dd;
+    friend class QGraphicsTextItemPrivate;
+};
+
+class QGraphicsSimpleTextItemPrivate;
+class Q_GUI_EXPORT QGraphicsSimpleTextItem : public QAbstractGraphicsShapeItem
+{
+public:
+    QGraphicsSimpleTextItem(QGraphicsItem *parent = 0
+#ifndef Q_QDOC
+                            // obsolete argument
+                            , QGraphicsScene *scene = 0
+#endif
+        );
+    QGraphicsSimpleTextItem(const QString &text, QGraphicsItem *parent = 0
+#ifndef Q_QDOC
+                            // obsolete argument
+                            , QGraphicsScene *scene = 0
+#endif
+        );
+    ~QGraphicsSimpleTextItem();
+
+    void setText(const QString &text);
+    QString text() const;
+
+    void setFont(const QFont &font);
+    QFont font() const;
+
+    QRectF boundingRect() const;
+    QPainterPath shape() const;
+    bool contains(const QPointF &point) const;
+
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
+
+    bool isObscuredBy(const QGraphicsItem *item) const;
+    QPainterPath opaqueArea() const;
+
+    enum { Type = 9 };
+    int type() const;
+
+protected:
+    bool supportsExtension(Extension extension) const;
+    void setExtension(Extension extension, const QVariant &variant);
+    QVariant extension(const QVariant &variant) const;
+
+private:
+    Q_DISABLE_COPY(QGraphicsSimpleTextItem)
+    Q_DECLARE_PRIVATE(QGraphicsSimpleTextItem)
+};
+
+class QGraphicsItemGroupPrivate;
+class Q_GUI_EXPORT QGraphicsItemGroup : public QGraphicsItem
+{
+public:
+    QGraphicsItemGroup(QGraphicsItem *parent = 0
+#ifndef Q_QDOC
+                       // obsolete argument
+                       , QGraphicsScene *scene = 0
+#endif
+        );
+    ~QGraphicsItemGroup();
+
+    void addToGroup(QGraphicsItem *item);
+    void removeFromGroup(QGraphicsItem *item);
+
+    QRectF boundingRect() const;
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0);
+
+    bool isObscuredBy(const QGraphicsItem *item) const;
+    QPainterPath opaqueArea() const;
+
+    enum { Type = 10 };
+    int type() const;
+
+private:
+    Q_DISABLE_COPY(QGraphicsItemGroup)
+    Q_DECLARE_PRIVATE(QGraphicsItemGroup)
+};
+
+template <class T> inline T qgraphicsitem_cast(QGraphicsItem *item)
+{
+    return int(static_cast<T>(0)->Type) == int(QGraphicsItem::Type)
+        || (item && int(static_cast<T>(0)->Type) == item->type()) ? static_cast<T>(item) : 0;
+}
+
+template <class T> inline T qgraphicsitem_cast(const QGraphicsItem *item)
+{
+    return int(static_cast<T>(0)->Type) == int(QGraphicsItem::Type)
+        || (item && int(static_cast<T>(0)->Type) == item->type()) ? static_cast<T>(item) : 0;
+}
+
+#ifndef QT_NO_DEBUG_STREAM
+Q_GUI_EXPORT QDebug operator<<(QDebug debug, QGraphicsItem *item);
+Q_GUI_EXPORT QDebug operator<<(QDebug debug, QGraphicsItem::GraphicsItemChange change);
+Q_GUI_EXPORT QDebug operator<<(QDebug debug, QGraphicsItem::GraphicsItemFlag flag);
+Q_GUI_EXPORT QDebug operator<<(QDebug debug, QGraphicsItem::GraphicsItemFlags flags);
+#endif
+
+QT_END_NAMESPACE
+
+Q_DECLARE_METATYPE(QGraphicsItem *)
+Q_DECLARE_METATYPE(QGraphicsScene *)
+
+QT_BEGIN_NAMESPACE
+
+#endif // QT_NO_GRAPHICSVIEW
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QGRAPHICSITEM_H
+
diff --git a/src/gui/graphicsview/qgraphicsitem_p.h b/src/gui/graphicsview/qgraphicsitem_p.h
new file mode 100644
index 0000000..c14b978
--- /dev/null
+++ b/src/gui/graphicsview/qgraphicsitem_p.h
@@ -0,0 +1,291 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QGRAPHICSITEM_P_H
+#define QGRAPHICSITEM_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of qapplication_*.cpp, qwidget*.cpp and qfiledialog.cpp.  This header
+// file may change from version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "qgraphicsitem.h"
+
+#if !defined(QT_NO_GRAPHICSVIEW) || (QT_EDITION & QT_MODULE_GRAPHICSVIEW) != QT_MODULE_GRAPHICSVIEW
+
+QT_BEGIN_NAMESPACE
+
+class QGraphicsItemPrivate;
+
+class QGraphicsItemCache
+{
+public:
+    QGraphicsItemCache() : allExposed(false) { }
+
+    // ItemCoordinateCache only
+    QRect boundingRect;
+    QSize fixedSize;
+    QString key;
+
+    // DeviceCoordinateCache only
+    struct DeviceData {
+        QTransform lastTransform;
+        QPoint cacheIndent;
+        QString key;
+    };
+    QMap<QPaintDevice *, DeviceData> deviceData;
+
+    // List of logical exposed rects
+    QVector<QRectF> exposed;
+    bool allExposed;
+
+    // Empty cache
+    void purge();
+};
+
+class Q_AUTOTEST_EXPORT QGraphicsItemPrivate
+{
+    Q_DECLARE_PUBLIC(QGraphicsItem)
+public:
+    struct TransformData
+    {
+        TransformData() : rotationX(0),rotationY(0),rotationZ(0),scaleX(1),scaleY(1), dirty(true)  {}
+        QTransform baseTransform;
+        QTransform transform;
+        QPointF transformCenter;
+        qreal rotationX,rotationY,rotationZ,scaleX,scaleY;
+        bool dirty;
+    };
+    enum Extra {
+        ExtraTransform,
+        ExtraToolTip,
+        ExtraCursor,
+        ExtraCacheData,
+        ExtraMaxDeviceCoordCacheSize,
+        ExtraBoundingRegionGranularity,
+        ExtraOpacity,
+        ExtraEffectiveOpacity
+    };
+
+    enum AncestorFlag {
+        NoFlag = 0,
+        AncestorHandlesChildEvents = 0x1,
+        AncestorClipsChildren = 0x2,
+        AncestorIgnoresTransformations = 0x4
+    };
+
+    inline QGraphicsItemPrivate()
+        : z(0),
+        scene(0),
+        parent(0),
+        index(-1),
+        depth(0),
+        acceptedMouseButtons(0x1f),
+        visible(1),
+        explicitlyHidden(0),
+        enabled(1),
+        explicitlyDisabled(0),
+        selected(0),
+        acceptsHover(0),
+        acceptDrops(0),
+        isMemberOfGroup(0),
+        handlesChildEvents(0),
+        itemDiscovered(0),
+        hasTransform(0),
+        hasCursor(0),
+        ancestorFlags(0),
+        cacheMode(0),
+        hasBoundingRegionGranularity(0),
+        flags(0),
+        hasOpacity(0),
+        isWidget(0),
+        dirty(0),
+        dirtyChildren(0),
+        localCollisionHack(0),
+        globalStackingOrder(-1),
+        sceneTransformIndex(-1),
+        q_ptr(0)
+    {
+    }
+
+    inline virtual ~QGraphicsItemPrivate()
+    { }
+
+    void updateAncestorFlag(QGraphicsItem::GraphicsItemFlag childFlag,
+                            AncestorFlag flag = NoFlag, bool enabled = false, bool root = true);
+    void setIsMemberOfGroup(bool enabled);
+    void remapItemPos(QEvent *event, QGraphicsItem *item);
+    QPointF genericMapFromScene(const QPointF &pos, const QWidget *viewport) const;
+    bool itemIsUntransformable() const;
+
+    // ### Qt 5: Remove. Workaround for reimplementation added after Qt 4.4.
+    virtual QVariant inputMethodQueryHelper(Qt::InputMethodQuery query) const;
+    static bool movableAncestorIsSelected(const QGraphicsItem *item);
+
+    void setPosHelper(const QPointF &pos, bool update);
+    void setVisibleHelper(bool newVisible, bool explicitly, bool update = true);
+    void setEnabledHelper(bool newEnabled, bool explicitly, bool update = true);
+    void updateHelper(const QRectF &rect = QRectF(), bool force = false);
+    void fullUpdateHelper(bool childrenOnly = false);
+    void resolveEffectiveOpacity(qreal effectiveParentOpacity);
+    void resolveDepth(int parentDepth);
+    void invalidateSceneTransformCache();
+
+    virtual void resolveFont(uint inheritedMask)
+    {
+        for (int i = 0; i < children.size(); ++i)
+            children.at(i)->d_ptr->resolveFont(inheritedMask);
+    }
+
+    virtual void resolvePalette(uint inheritedMask)
+    {
+        for (int i = 0; i < children.size(); ++i)
+            children.at(i)->d_ptr->resolveFont(inheritedMask);
+    }
+
+    virtual bool isProxyWidget() const;
+
+    inline QVariant extra(Extra type) const
+    {
+        for (int i = 0; i < extras.size(); ++i) {
+            const ExtraStruct &extra = extras.at(i);
+            if (extra.type == type)
+                return extra.value;
+        }
+        return QVariant();
+    }
+
+    inline void setExtra(Extra type, const QVariant &value)
+    {
+        int index = -1;
+        for (int i = 0; i < extras.size(); ++i) {
+            if (extras.at(i).type == type) {
+                index = i;
+                break;
+            }
+        }
+
+        if (index == -1) {
+            extras << ExtraStruct(type, value);
+        } else {
+            extras[index].value = value;
+        }
+    }
+
+    inline void unsetExtra(Extra type)
+    {
+        for (int i = 0; i < extras.size(); ++i) {
+            if (extras.at(i).type == type) {
+                extras.removeAt(i);
+                return;
+            }
+        }
+    }
+    
+    struct ExtraStruct {
+        ExtraStruct(Extra type, QVariant value)
+            : type(type), value(value)
+        { }
+
+        Extra type;
+        QVariant value;
+
+        bool operator<(Extra extra) const
+        { return type < extra; }
+    };
+    
+    QList<ExtraStruct> extras;
+
+    QGraphicsItemCache *extraItemCache() const;
+    void removeExtraItemCache();
+
+    QPointF pos;
+    qreal z;
+    QGraphicsScene *scene;
+    QGraphicsItem *parent;
+    QList<QGraphicsItem *> children;
+    int index;
+    int depth;
+
+    // Packed 32 bytes
+    quint32 acceptedMouseButtons : 5;
+    quint32 visible : 1;
+    quint32 explicitlyHidden : 1;
+    quint32 enabled : 1;
+    quint32 explicitlyDisabled : 1;
+    quint32 selected : 1;
+    quint32 acceptsHover : 1;
+    quint32 acceptDrops : 1;
+    quint32 isMemberOfGroup : 1;
+    quint32 handlesChildEvents : 1;
+    quint32 itemDiscovered : 1;
+    quint32 hasTransform : 1;
+    quint32 hasCursor : 1;
+    quint32 ancestorFlags : 3;
+    quint32 cacheMode : 2;
+    quint32 hasBoundingRegionGranularity : 1;
+    quint32 flags : 9;
+
+    // New 32 bytes
+    quint32 hasOpacity : 1;
+    quint32 isWidget : 1;
+    quint32 dirty : 1;    
+    quint32 dirtyChildren : 1;    
+    quint32 localCollisionHack : 1;
+
+    // Optional stacking order
+    int globalStackingOrder;
+    int sceneTransformIndex;
+
+    QGraphicsItem *q_ptr;
+};
+
+QT_END_NAMESPACE
+
+#endif // QT_NO_GRAPHICSVIEW
+
+#endif
diff --git a/src/gui/graphicsview/qgraphicsitemanimation.cpp b/src/gui/graphicsview/qgraphicsitemanimation.cpp
new file mode 100644
index 0000000..1b58b9c
--- /dev/null
+++ b/src/gui/graphicsview/qgraphicsitemanimation.cpp
@@ -0,0 +1,599 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*!
+    \class QGraphicsItemAnimation
+    \brief The QGraphicsItemAnimation class provides simple animation
+    support for QGraphicsItem.
+    \since 4.2
+    \ingroup multimedia
+    \ingroup graphicsview-api
+
+    The QGraphicsItemAnimation class animates a QGraphicsItem. You can
+    schedule changes to the item's transformation matrix at
+    specified steps. The QGraphicsItemAnimation class has a 
+    current step value. When this value changes the transformations 
+    scheduled at that step are performed. The current step of the 
+    animation is set with the \c setStep() function.
+
+    QGraphicsItemAnimation will do a simple linear interpolation
+    between the nearest adjacent scheduled changes to calculate the 
+    matrix. For instance, if you set the position of an item at values
+    0.0 and 1.0, the animation will show the item moving in a straight
+    line between these positions. The same is true for scaling and 
+    rotation.
+
+    It is usual to use the class with a QTimeLine. The timeline's
+    \l{QTimeLine::}{valueChanged()} signal is then connected to the 
+    \c setStep() slot. For example, you can set up an item for rotation
+    by calling \c setRotationAt() for different step values.
+    The animations timeline is set with the setTimeLine() function.
+
+    An example animation with a timeline follows:
+
+    \snippet doc/src/snippets/timeline/main.cpp 0
+
+    Note that steps lie between 0.0 and 1.0. It may be necessary to use
+    \l{QTimeLine::}{setUpdateInterval()}. The default update interval
+    is 40 ms. A scheduled transformation cannot be removed when set,
+    so scheduling several transformations of the same kind (e.g.,
+    rotations) at the same step is not recommended.
+
+    \sa QTimeLine, {The Graphics View Framework}
+*/
+
+#include "qgraphicsitemanimation.h"
+
+#ifndef QT_NO_GRAPHICSVIEW
+
+#include "qgraphicsitem.h"
+
+#include <QtCore/qtimeline.h>
+#include <QtCore/qpoint.h>
+#include <QtCore/qpointer.h>
+#include <QtCore/qpair.h>
+#include <QtGui/qmatrix.h>
+
+QT_BEGIN_NAMESPACE
+
+class QGraphicsItemAnimationPrivate
+{
+public:
+    inline QGraphicsItemAnimationPrivate()
+        : q(0), timeLine(0), item(0), step(0)
+    { }
+
+    QGraphicsItemAnimation *q;
+
+    QPointer<QTimeLine> timeLine;
+    QGraphicsItem *item;
+
+    QPointF startPos;
+    QMatrix startMatrix;
+
+    qreal step;
+
+    struct Pair {
+        Pair(qreal a, qreal b) : step(a), value(b) {}
+        bool operator <(const Pair &other) const
+        { return step < other.step; }
+        bool operator==(const Pair &other) const
+        { return step == other.step; }
+        qreal step;
+        qreal value;
+    };
+    QList<Pair> xPosition;
+    QList<Pair> yPosition;
+    QList<Pair> rotation;
+    QList<Pair> verticalScale;
+    QList<Pair> horizontalScale;
+    QList<Pair> verticalShear;
+    QList<Pair> horizontalShear;
+    QList<Pair> xTranslation;
+    QList<Pair> yTranslation;
+
+    qreal linearValueForStep(qreal step, QList<Pair> *source, qreal defaultValue = 0);
+    void insertUniquePair(qreal step, qreal value, QList<Pair> *binList, const char* method);
+};
+
+qreal QGraphicsItemAnimationPrivate::linearValueForStep(qreal step, QList<Pair> *source, qreal defaultValue)
+{
+    if (source->isEmpty())
+        return defaultValue;
+    step = qMin<qreal>(qMax<qreal>(step, 0), 1);
+
+    if (step == 1)
+        return source->last().value;
+
+    qreal stepBefore = 0;
+    qreal stepAfter = 1;
+    qreal valueBefore = source->first().step == 0 ? source->first().value : defaultValue;
+    qreal valueAfter = source->last().value;
+
+    // Find the closest step and value before the given step.
+    for (int i = 0; i < source->size() && step >= source->at(i).step; ++i) {
+        stepBefore = source->at(i).step;
+        valueBefore = source->at(i).value;
+    }
+
+    // Find the closest step and value after the given step.
+    for (int j = source->size() - 1; j >= 0 && step < source->at(j).step; --j) {
+        stepAfter = source->at(j).step;
+        valueAfter = source->at(j).value;
+    }
+
+    // Do a simple linear interpolation.
+    return valueBefore + (valueAfter - valueBefore) * ((step - stepBefore) / (stepAfter - stepBefore));
+}
+
+void QGraphicsItemAnimationPrivate::insertUniquePair(qreal step, qreal value, QList<Pair> *binList, const char* method)
+{
+    if (step < 0.0 || step > 1.0) {
+        qWarning("QGraphicsItemAnimation::%s: invalid step = %f", method, step);
+        return;
+    }
+
+    Pair pair(step, value);
+
+    QList<Pair>::iterator result = qBinaryFind(binList->begin(), binList->end(), pair);
+    if (result != binList->end())
+        result->value = value;
+    else {
+        *binList << pair;
+        qSort(binList->begin(), binList->end());
+    }
+}
+
+/*!
+  Constructs an animation object with the given \a parent.
+*/
+QGraphicsItemAnimation::QGraphicsItemAnimation(QObject *parent)
+    : QObject(parent), d(new QGraphicsItemAnimationPrivate)
+{
+    d->q = this;
+}
+
+/*!
+  Destroys the animation object.
+*/
+QGraphicsItemAnimation::~QGraphicsItemAnimation()
+{
+    delete d;
+}
+
+/*!
+  Returns the item on which the animation object operates.
+
+  \sa setItem()
+*/
+QGraphicsItem *QGraphicsItemAnimation::item() const
+{
+    return d->item;
+}
+
+/*!
+  Sets the specified \a item to be used in the animation.
+
+  \sa item()
+*/
+void QGraphicsItemAnimation::setItem(QGraphicsItem *item)
+{
+    d->item = item;
+    d->startPos = d->item->pos();
+}
+
+/*!
+  Returns the timeline object used to control the rate at which the animation
+  occurs.
+
+  \sa setTimeLine()
+*/
+QTimeLine *QGraphicsItemAnimation::timeLine() const
+{
+    return d->timeLine;
+}
+
+/*!
+  Sets the timeline object used to control the rate of animation to the \a timeLine
+  specified.
+
+  \sa timeLine()
+*/
+void QGraphicsItemAnimation::setTimeLine(QTimeLine *timeLine)
+{
+    if (d->timeLine == timeLine)
+        return;
+    if (d->timeLine)
+        delete d->timeLine;
+    if (!timeLine)
+        return;
+    d->timeLine = timeLine;
+    connect(timeLine, SIGNAL(valueChanged(qreal)), this, SLOT(setStep(qreal)));
+}
+
+/*!
+  Returns the position of the item at the given \a step value.
+
+  \sa setPosAt()
+*/
+QPointF QGraphicsItemAnimation::posAt(qreal step) const
+{
+    if (step < 0.0 || step > 1.0)
+        qWarning("QGraphicsItemAnimation::posAt: invalid step = %f", step);
+
+    return QPointF(d->linearValueForStep(step, &d->xPosition, d->startPos.x()),
+                   d->linearValueForStep(step, &d->yPosition, d->startPos.y()));
+}
+
+/*!
+  \fn void QGraphicsItemAnimation::setPosAt(qreal step, const QPointF &point)
+
+  Sets the position of the item at the given \a step value to the \a point specified.
+
+  \sa posAt()
+*/
+void QGraphicsItemAnimation::setPosAt(qreal step, const QPointF &pos)
+{
+    d->insertUniquePair(step, pos.x(), &d->xPosition, "setPosAt");
+    d->insertUniquePair(step, pos.y(), &d->yPosition, "setPosAt");
+}
+
+/*!
+  Returns all explicitly inserted positions.
+
+  \sa posAt(), setPosAt()
+*/
+QList<QPair<qreal, QPointF> > QGraphicsItemAnimation::posList() const
+{
+    QList<QPair<qreal, QPointF> > list;
+    for (int i = 0; i < d->xPosition.size(); ++i)
+        list << QPair<qreal, QPointF>(d->xPosition.at(i).step, QPointF(d->xPosition.at(i).value, d->yPosition.at(i).value));
+    
+    return list;
+}
+
+/*!
+  Returns the matrix used to transform the item at the specified \a step value.
+*/
+QMatrix QGraphicsItemAnimation::matrixAt(qreal step) const
+{
+    if (step < 0.0 || step > 1.0)
+        qWarning("QGraphicsItemAnimation::matrixAt: invalid step = %f", step);
+
+    QMatrix matrix;
+    if (!d->rotation.isEmpty())
+        matrix.rotate(rotationAt(step));
+    if (!d->verticalScale.isEmpty())
+        matrix.scale(horizontalScaleAt(step), verticalScaleAt(step));
+    if (!d->verticalShear.isEmpty())
+        matrix.shear(horizontalShearAt(step), verticalShearAt(step));
+    if (!d->xTranslation.isEmpty())
+        matrix.translate(xTranslationAt(step), yTranslationAt(step));
+    return matrix;
+}
+
+/*!
+  Returns the angle at which the item is rotated at the specified \a step value.
+
+  \sa setRotationAt()
+*/
+qreal QGraphicsItemAnimation::rotationAt(qreal step) const
+{
+    if (step < 0.0 || step > 1.0)
+        qWarning("QGraphicsItemAnimation::rotationAt: invalid step = %f", step);
+
+    return d->linearValueForStep(step, &d->rotation);
+}
+
+/*!
+  Sets the rotation of the item at the given \a step value to the \a angle specified.
+
+  \sa rotationAt()
+*/
+void QGraphicsItemAnimation::setRotationAt(qreal step, qreal angle)
+{
+    d->insertUniquePair(step, angle, &d->rotation, "setRotationAt");
+}
+
+/*!
+  Returns all explicitly inserted rotations.
+
+  \sa rotationAt(), setRotationAt()
+*/
+QList<QPair<qreal, qreal> > QGraphicsItemAnimation::rotationList() const
+{
+    QList<QPair<qreal, qreal> > list;
+    for (int i = 0; i < d->rotation.size(); ++i)
+        list << QPair<qreal, qreal>(d->rotation.at(i).step, d->rotation.at(i).value);
+    
+    return list;
+}
+
+/*!
+  Returns the horizontal translation of the item at the specified \a step value.
+
+  \sa setTranslationAt()
+*/
+qreal QGraphicsItemAnimation::xTranslationAt(qreal step) const
+{
+    if (step < 0.0 || step > 1.0)
+        qWarning("QGraphicsItemAnimation::xTranslationAt: invalid step = %f", step);
+
+    return d->linearValueForStep(step, &d->xTranslation);
+}
+
+/*!
+  Returns the vertical translation of the item at the specified \a step value.
+
+  \sa setTranslationAt()
+*/
+qreal QGraphicsItemAnimation::yTranslationAt(qreal step) const
+{
+    if (step < 0.0 || step > 1.0)
+        qWarning("QGraphicsItemAnimation::yTranslationAt: invalid step = %f", step);
+
+    return d->linearValueForStep(step, &d->yTranslation);
+}
+
+/*!
+  Sets the translation of the item at the given \a step value using the horizontal
+  and vertical coordinates specified by \a dx and \a dy.
+
+  \sa xTranslationAt(), yTranslationAt()
+*/
+void QGraphicsItemAnimation::setTranslationAt(qreal step, qreal dx, qreal dy)
+{
+    d->insertUniquePair(step, dx, &d->xTranslation, "setTranslationAt");
+    d->insertUniquePair(step, dy, &d->yTranslation, "setTranslationAt");
+}
+
+/*!
+  Returns all explicitly inserted translations.
+
+  \sa xTranslationAt(), yTranslationAt(), setTranslationAt()
+*/
+QList<QPair<qreal, QPointF> > QGraphicsItemAnimation::translationList() const
+{
+    QList<QPair<qreal, QPointF> > list;
+    for (int i = 0; i < d->xTranslation.size(); ++i)
+        list << QPair<qreal, QPointF>(d->xTranslation.at(i).step, QPointF(d->xTranslation.at(i).value, d->yTranslation.at(i).value));
+    
+    return list;
+}
+
+/*!
+  Returns the vertical scale for the item at the specified \a step value.
+
+  \sa setScaleAt()
+*/
+qreal QGraphicsItemAnimation::verticalScaleAt(qreal step) const
+{
+    if (step < 0.0 || step > 1.0)
+        qWarning("QGraphicsItemAnimation::verticalScaleAt: invalid step = %f", step);
+
+    return d->linearValueForStep(step, &d->verticalScale, 1);
+}
+
+/*!
+  Returns the horizontal scale for the item at the specified \a step value.
+
+  \sa setScaleAt()
+*/
+qreal QGraphicsItemAnimation::horizontalScaleAt(qreal step) const
+{
+    if (step < 0.0 || step > 1.0)
+        qWarning("QGraphicsItemAnimation::horizontalScaleAt: invalid step = %f", step);
+
+    return d->linearValueForStep(step, &d->horizontalScale, 1);
+}
+
+/*!
+  Sets the scale of the item at the given \a step value using the horizontal and
+  vertical scale factors specified by \a sx and \a sy.
+
+  \sa verticalScaleAt(), horizontalScaleAt()
+*/
+void QGraphicsItemAnimation::setScaleAt(qreal step, qreal sx, qreal sy)
+{
+    d->insertUniquePair(step, sx, &d->horizontalScale, "setScaleAt");
+    d->insertUniquePair(step, sy, &d->verticalScale, "setScaleAt");
+}
+
+/*!
+  Returns all explicitly inserted scales.
+
+  \sa verticalScaleAt(), horizontalScaleAt(), setScaleAt()
+*/
+QList<QPair<qreal, QPointF> > QGraphicsItemAnimation::scaleList() const
+{
+    QList<QPair<qreal, QPointF> > list;
+    for (int i = 0; i < d->horizontalScale.size(); ++i)
+        list << QPair<qreal, QPointF>(d->horizontalScale.at(i).step, QPointF(d->horizontalScale.at(i).value, d->verticalScale.at(i).value));
+    
+    return list;
+}
+
+/*!
+  Returns the vertical shear for the item at the specified \a step value.
+
+  \sa setShearAt()
+*/
+qreal QGraphicsItemAnimation::verticalShearAt(qreal step) const
+{
+    if (step < 0.0 || step > 1.0)
+        qWarning("QGraphicsItemAnimation::verticalShearAt: invalid step = %f", step);
+
+    return d->linearValueForStep(step, &d->verticalShear, 0);
+}
+
+/*!
+  Returns the horizontal shear for the item at the specified \a step value.
+
+  \sa setShearAt()
+*/
+qreal QGraphicsItemAnimation::horizontalShearAt(qreal step) const
+{
+    if (step < 0.0 || step > 1.0)
+        qWarning("QGraphicsItemAnimation::horizontalShearAt: invalid step = %f", step);
+
+    return d->linearValueForStep(step, &d->horizontalShear, 0);
+}
+
+/*!
+  Sets the shear of the item at the given \a step value using the horizontal and
+  vertical shear factors specified by \a sh and \a sv.
+
+  \sa verticalShearAt(), horizontalShearAt()
+*/
+void QGraphicsItemAnimation::setShearAt(qreal step, qreal sh, qreal sv)
+{
+    d->insertUniquePair(step, sh, &d->horizontalShear, "setShearAt");
+    d->insertUniquePair(step, sv, &d->verticalShear, "setShearAt");
+}
+
+/*!
+  Returns all explicitly inserted shears.
+
+  \sa verticalShearAt(), horizontalShearAt(), setShearAt()
+*/
+QList<QPair<qreal, QPointF> > QGraphicsItemAnimation::shearList() const
+{
+    QList<QPair<qreal, QPointF> > list;
+    for (int i = 0; i < d->horizontalShear.size(); ++i)
+        list << QPair<qreal, QPointF>(d->horizontalShear.at(i).step, QPointF(d->horizontalShear.at(i).value, d->verticalShear.at(i).value));
+    
+    return list;
+}
+
+/*!
+  Clears the scheduled transformations used for the animation, but
+  retains the item and timeline.
+*/
+void QGraphicsItemAnimation::clear()
+{
+    d->xPosition.clear();
+    d->yPosition.clear();
+    d->rotation.clear();
+    d->verticalScale.clear();
+    d->horizontalScale.clear();
+    d->verticalShear.clear();
+    d->horizontalShear.clear();
+    d->xTranslation.clear();
+    d->yTranslation.clear();
+}
+
+/*!
+  \fn void QGraphicsItemAnimation::setStep(qreal step)
+
+  Sets the current \a step value for the animation, causing the
+  transformations scheduled at this step to be performed.
+*/
+void QGraphicsItemAnimation::setStep(qreal x)
+{
+    if (x < 0.0 || x > 1.0) {
+        qWarning("QGraphicsItemAnimation::setStep: invalid step = %f", x);
+        return;
+    }
+
+    beforeAnimationStep(x);
+
+    d->step = x;
+    if (d->item) {
+        if (!d->xPosition.isEmpty() || !d->yPosition.isEmpty())
+            d->item->setPos(posAt(x));
+        if (!d->rotation.isEmpty()
+            || !d->verticalScale.isEmpty()
+            || !d->horizontalScale.isEmpty()
+            || !d->verticalShear.isEmpty()
+            || !d->horizontalShear.isEmpty()
+            || !d->xTranslation.isEmpty()
+            || !d->yTranslation.isEmpty()) {
+            d->item->setMatrix(d->startMatrix * matrixAt(x));
+        }
+    }
+
+    afterAnimationStep(x);
+}
+
+/*!
+    Resets the item to its starting position and transformation.
+
+    \obsolete
+
+    You can call setStep(0) instead.
+*/
+void QGraphicsItemAnimation::reset()
+{
+    if (!d->item)
+        return;
+    d->startPos = d->item->pos();
+    d->startMatrix = d->item->matrix();
+}
+
+/*!
+  \fn void QGraphicsItemAnimation::beforeAnimationStep(qreal step)
+
+  This method is meant to be overridden by subclassed that needs to
+  execute additional code before a new step takes place. The
+  animation \a step is provided for use in cases where the action
+  depends on its value.
+*/
+void QGraphicsItemAnimation::beforeAnimationStep(qreal step)
+{
+    Q_UNUSED(step);
+}
+
+/*!
+  \fn void QGraphicsItemAnimation::afterAnimationStep(qreal step)
+
+  This method is meant to be overridden in subclasses that need to
+  execute additional code after a new step has taken place. The
+  animation \a step is provided for use in cases where the action
+  depends on its value.
+*/
+void QGraphicsItemAnimation::afterAnimationStep(qreal step)
+{
+    Q_UNUSED(step);
+}
+
+QT_END_NAMESPACE
+
+#endif // QT_NO_GRAPHICSVIEW
diff --git a/src/gui/graphicsview/qgraphicsitemanimation.h b/src/gui/graphicsview/qgraphicsitemanimation.h
new file mode 100644
index 0000000..c1312d4
--- /dev/null
+++ b/src/gui/graphicsview/qgraphicsitemanimation.h
@@ -0,0 +1,120 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QGRAPHICSITEMANIMATION_H
+#define QGRAPHICSITEMANIMATION_H
+
+#include <QtCore/qobject.h>
+
+#if !defined(QT_NO_GRAPHICSVIEW) || (QT_EDITION & QT_MODULE_GRAPHICSVIEW) != QT_MODULE_GRAPHICSVIEW
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Gui)
+
+class QGraphicsItem;
+class QMatrix;
+class QPointF;
+class QTimeLine;
+template <class T1, class T2> struct QPair;
+
+class QGraphicsItemAnimationPrivate;
+class Q_GUI_EXPORT QGraphicsItemAnimation : public QObject
+{
+    Q_OBJECT
+public:
+    QGraphicsItemAnimation(QObject *parent = 0);
+    virtual ~QGraphicsItemAnimation();
+
+    QGraphicsItem *item() const;
+    void setItem(QGraphicsItem *item);
+
+    QTimeLine *timeLine() const;
+    void setTimeLine(QTimeLine *timeLine);
+
+    QPointF posAt(qreal step) const;
+    QList<QPair<qreal, QPointF> > posList() const;
+    void setPosAt(qreal step, const QPointF &pos);
+
+    QMatrix matrixAt(qreal step) const;
+
+    qreal rotationAt(qreal step) const;
+    QList<QPair<qreal, qreal> > rotationList() const;
+    void setRotationAt(qreal step, qreal angle);
+
+    qreal xTranslationAt(qreal step) const;
+    qreal yTranslationAt(qreal step) const;
+    QList<QPair<qreal, QPointF> > translationList() const;
+    void setTranslationAt(qreal step, qreal dx, qreal dy);
+
+    qreal verticalScaleAt(qreal step) const;
+    qreal horizontalScaleAt(qreal step) const;
+    QList<QPair<qreal, QPointF> > scaleList() const;
+    void setScaleAt(qreal step, qreal sx, qreal sy);
+
+    qreal verticalShearAt(qreal step) const;
+    qreal horizontalShearAt(qreal step) const;
+    QList<QPair<qreal, QPointF> > shearList() const;
+    void setShearAt(qreal step, qreal sh, qreal sv);
+
+    void clear();
+
+public Q_SLOTS:
+    void setStep(qreal x);
+    void reset();
+
+protected:
+    virtual void beforeAnimationStep(qreal step);
+    virtual void afterAnimationStep(qreal step);
+
+private:
+    Q_DISABLE_COPY(QGraphicsItemAnimation)
+    QGraphicsItemAnimationPrivate *d;
+};
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QT_NO_GRAPHICSVIEW
+#endif
diff --git a/src/gui/graphicsview/qgraphicslayout.cpp b/src/gui/graphicsview/qgraphicslayout.cpp
new file mode 100644
index 0000000..f78b8c8
--- /dev/null
+++ b/src/gui/graphicsview/qgraphicslayout.cpp
@@ -0,0 +1,423 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qapplication.h"
+
+#ifndef QT_NO_GRAPHICSVIEW
+#include "qgraphicslayout.h"
+#include "qgraphicslayout_p.h"
+#include "qgraphicslayoutitem.h"
+#include "qgraphicslayoutitem_p.h"
+#include "qgraphicswidget.h"
+#include "qgraphicswidget_p.h"
+#include "qgraphicsscene.h"
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    \class QGraphicsLayout
+    \brief The QGraphicsLayout class provides the base class for all layouts
+    in Graphics View.
+    \since 4.4
+    \ingroup multimedia
+    \ingroup graphicsview-api
+
+    QGraphicsLayout is an abstract class that defines a virtual API for
+    arranging QGraphicsWidget children and other QGraphicsLayoutItem objects
+    for a QGraphicsWidget. QGraphicsWidget assigns responsibility to a
+    QGraphicsLayout through QGraphicsWidget::setLayout(). As the widget
+    is resized, the layout will automatically arrange the widget's children.
+    QGraphicsLayout inherits QGraphicsLayoutItem, so, it can be managed by
+    any layout, including its own subclasses.
+
+    \section1 Writing a Custom Layout
+
+    You can use QGraphicsLayout as a base to write your own custom layout
+    (e.g., a flowlayout), but it is more common to use one of its subclasses
+    instead - QGraphicsLinearLayout or QGraphicsGridLayout. When creating
+    a custom layout, the following functions must be reimplemented as a bare
+    minimum:
+
+    \table
+    \header \o Function                     \o Description
+    \row     \o QGraphicsLayoutItem::setGeometry()
+               \o Notifies you when the geometry of the layout is set. You can
+                   store the geometry in your own layout class in a reimplementation
+                   of this function.
+    \row    \o QGraphicsLayoutItem::sizeHint()
+               \o Returns the layout's size hints.
+    \row    \o QGraphicsLayout::count()
+              \o Returns the number of items in your layout.
+    \row    \o QGraphicsLayout::itemAt()
+              \o Returns a pointer to an item in your layout.
+    \row    \o QGraphicsLayout::removeAt()
+              \o Removes an item from your layout without destroying it.
+    \endtable
+
+    For more details on how to implement each function, refer to the individual
+    function documentation.
+
+    Each layout defines its own API for arranging widgets and layout items.
+    For example, with a grid layout, you require a row and a
+    column index with optional row and column spans, alignment, spacing, and more.
+    A linear layout, however, requires a single row or column index to position its
+    items. For a grid layout, the order of insertion does not affect the layout in
+    any way, but for a linear layout, the order is essential. When writing your own
+    layout subclass, you are free to choose the API that best suits your layout.
+
+    \section1 Activating the Layout
+
+    When the layout's geometry changes, QGraphicsLayout immediately rearranges
+    all of its managed items by calling setGeometry() on each item. This
+    rearrangement is called \e activating the layout.
+
+    QGraphicsLayout updates its own geometry to match the contentsRect() of the
+    QGraphicsLayoutItem it is managing. Thus, it will automatically rearrange all
+    its items when the widget is resized. QGraphicsLayout caches the sizes of all
+    its managed items to avoid calling setGeometry() too often.
+
+    \note A QGraphicsLayout will have the same geometry as the contentsRect()
+    of the widget (not the layout) it is assigned to.
+
+    \section2 Activating the Layout Implicitly
+
+    The layout can be activated implicitly using one of two ways: by calling
+    activate() or by calling invalidate(). Calling activate() activates the layout
+    immediately. In contrast, calling invalidate() is delayed, as it posts a
+    \l{QEvent::LayoutRequest}{LayoutRequest} event to the managed widget. Due
+    to event compression, the activate() will only be called once after control has
+    returned to the event loop. This is referred to as \e invalidating the layout.
+    Invalidating the layout also invalidates any cached information. Also, the
+    invalidate() function is a virtual function. So, you can invalidate your own
+    cache in a subclass of QGraphicsLayout by reimplementing this function.
+
+    \section1 Event Handling
+
+    QGraphicsLayout listens to events for the widget it manages through the
+    virtual widgetEvent() event handler. When the layout is assigned to a
+    widget, all events delivered to the widget are first processed by
+    widgetEvent(). This allows the layout to be aware of any relevant state
+    changes on the widget such as visibility changes or layout direction changes.
+
+    \section1 Margin Handling
+
+    The margins of a QGraphicsLayout can be modified by reimplementing
+    setContentsMargins() and getContentsMargins().
+
+*/
+
+/*!
+    Contructs a QGraphicsLayout object.
+    
+    \a parent is passed to QGraphicsLayoutItem's constructor and the
+    QGraphicsLayoutItem's isLayout argument is set to \e true.
+*/
+QGraphicsLayout::QGraphicsLayout(QGraphicsLayoutItem *parent)
+    : QGraphicsLayoutItem(*new QGraphicsLayoutPrivate)
+{
+    setParentLayoutItem(parent);
+    if (parent && !parent->isLayout()) {
+        // If a layout has a parent that is not a layout it must be a QGraphicsWidget.
+        QGraphicsItem *itemParent = parent->graphicsItem();
+        if (itemParent && itemParent->isWidget()) {
+            static_cast<QGraphicsWidget *>(itemParent)->d_func()->setLayout_helper(this);
+        } else {
+            qWarning("QGraphicsLayout::QGraphicsLayout: Attempt to create a layout with a parent that is"
+                    " neither a QGraphicsWidget nor QGraphicsLayout");
+        }
+    }
+    setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding, QSizePolicy::DefaultType);
+    setOwnedByLayout(true);
+}
+
+/*!
+    \internal
+*/
+QGraphicsLayout::QGraphicsLayout(QGraphicsLayoutPrivate &dd, QGraphicsLayoutItem *parent)
+    : QGraphicsLayoutItem(dd)
+{
+    setParentLayoutItem(parent);
+    if (parent && !parent->isLayout()) {
+        // If a layout has a parent that is not a layout it must be a QGraphicsWidget.
+        QGraphicsItem *itemParent = parent->graphicsItem();
+        if (itemParent && itemParent->isWidget()) {
+            static_cast<QGraphicsWidget *>(itemParent)->d_func()->setLayout_helper(this);
+        } else {
+            qWarning("QGraphicsLayout::QGraphicsLayout: Attempt to create a layout with a parent that is"
+                    " neither a QGraphicsWidget nor QGraphicsLayout");
+        }
+    }
+    setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding, QSizePolicy::DefaultType);
+    setOwnedByLayout(true);
+}
+
+/*!
+    Destroys the QGraphicsLayout object.
+*/
+QGraphicsLayout::~QGraphicsLayout()
+{
+}
+
+/*!
+    Sets the contents margins to \a left, \a top, \a right and \a bottom. The
+    default contents margins for toplevel layouts are style dependent
+    (by querying the pixelMetric for QStyle::PM_LayoutLeftMargin,
+    QStyle::PM_LayoutTopMargin, QStyle::PM_LayoutRightMargin and
+    QStyle::PM_LayoutBottomMargin).
+
+    For sublayouts the default margins are 0.
+
+    Changing the contents margins automatically invalidates the layout.
+
+    \sa invalidate()
+*/
+void QGraphicsLayout::setContentsMargins(qreal left, qreal top, qreal right, qreal bottom)
+{
+    Q_D(QGraphicsLayout);
+    if (d->left == left && d->top == top && d->right == right && d->bottom == bottom)
+        return;
+    d->left = left;
+    d->right = right;
+    d->top = top;
+    d->bottom = bottom;
+    invalidate();
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsLayout::getContentsMargins(qreal *left, qreal *top, qreal *right, qreal *bottom) const
+{
+    Q_D(const QGraphicsLayout);
+    d->getMargin(left, d->left, QStyle::PM_LayoutLeftMargin);
+    d->getMargin(top, d->top, QStyle::PM_LayoutTopMargin);
+    d->getMargin(right, d->right, QStyle::PM_LayoutRightMargin);
+    d->getMargin(bottom, d->bottom, QStyle::PM_LayoutBottomMargin);
+}
+
+/*!
+    Activates the layout, causing all items in the layout to be immediately
+    rearranged. This function is based on calling count() and itemAt(), and
+    then calling setGeometry() on all items sequentially. When activated,
+    the layout will adjust its geometry to its parent's contentsRect().
+    The parent will then invalidate any layout of its own.
+
+    If called in sequence or recursively, e.g., by one of the arranged items
+    in response to being resized, this function will do nothing.
+
+    Note that the layout is free to use geometry caching to optimize this
+    process.  To forcefully invalidate any such cache, you can call
+    invalidate() before calling activate().
+
+    \sa invalidate()
+*/
+void QGraphicsLayout::activate()
+{
+    Q_D(QGraphicsLayout);
+    if (d->activated)
+        return;
+
+    d->activateRecursive(this);
+    
+    // we don't call activate on a sublayout, but somebody might.
+    // Therefore, we walk to the parentitem of the toplevel layout.
+    QGraphicsLayoutItem *parentItem = this;
+    while (parentItem && parentItem->isLayout())
+        parentItem = parentItem->parentLayoutItem();
+    if (!parentItem)
+        return;
+    Q_ASSERT(!parentItem->isLayout());
+
+    setGeometry(parentItem->contentsRect());    // relayout children
+    
+    // ### bug, should be parentItem ?
+    parentLayoutItem()->updateGeometry();            // bubble up; will set activated to false
+    // ### too many resizes? maybe we should walk up the chain to the
+    // ### top-level layouted layoutItem and call activate there.
+}
+
+/*!
+    Returns true if the layout is currently being activated; otherwise,
+    returns false. If the layout is being activated, this means that it is
+    currently in the process of rearranging its items (i.e., the activate()
+    function has been called, and has not yet returned).
+
+    \sa activate(), invalidate()
+*/
+bool QGraphicsLayout::isActivated() const
+{
+    Q_D(const QGraphicsLayout);
+    return d->activated;
+}
+
+/*!
+    Clears any cached geometry and size hint information in the layout, and
+    posts a \l{QEvent::LayoutRequest}{LayoutRequest} event to the managed
+    parent QGraphicsLayoutItem.
+
+    \sa activate(), setGeometry()
+*/
+void QGraphicsLayout::invalidate()
+{
+    // only mark layouts as invalid (activated = false) if we can post a LayoutRequest event.
+    QGraphicsLayoutItem *layoutItem = this;
+    while (layoutItem && layoutItem->isLayout()) {
+        // we could call updateGeometry(), but what if that method
+        // does not call the base implementation? In addition, updateGeometry()
+        // does more than we need.
+        layoutItem->d_func()->sizeHintCacheDirty = true;
+        layoutItem = layoutItem->parentLayoutItem();        
+    }
+    if (layoutItem)
+        layoutItem->d_func()->sizeHintCacheDirty = true;
+
+    bool postIt = layoutItem ? !layoutItem->isLayout() : false;
+    if (postIt) {
+        layoutItem = this;
+        while (layoutItem && layoutItem->isLayout()
+                && static_cast<QGraphicsLayout*>(layoutItem)->d_func()->activated) {
+            static_cast<QGraphicsLayout*>(layoutItem)->d_func()->activated = false;
+            layoutItem = layoutItem->parentLayoutItem();
+        }
+        if (layoutItem && !layoutItem->isLayout()) {
+            // If a layout has a parent that is not a layout it must be a QGraphicsWidget.
+            QApplication::postEvent(static_cast<QGraphicsWidget *>(layoutItem), new QEvent(QEvent::LayoutRequest));
+        }
+    }
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsLayout::updateGeometry()
+{
+    QGraphicsLayoutItem::updateGeometry();
+    if (QGraphicsLayoutItem *parentItem = parentLayoutItem()) {
+        if (parentItem->isLayout()) {
+            parentItem->updateGeometry();
+        } else {
+            invalidate();
+        }
+    }
+}
+
+/*!
+    This virtual event handler receives all events for the managed
+    widget. QGraphicsLayout uses this event handler to listen for layout
+    related events such as geometry changes, layout changes or layout
+    direction changes.
+    
+    \a e is a pointer to the event.
+
+    You can reimplement this event handler to track similar events for your
+    own custom layout.
+
+    \sa QGraphicsWidget::event(), QGraphicsItem::sceneEvent()
+*/
+void QGraphicsLayout::widgetEvent(QEvent *e)
+{
+    switch (e->type()) {
+    case QEvent::GraphicsSceneResize:
+        if (isActivated()) {
+            setGeometry(parentLayoutItem()->contentsRect());
+        } else {
+            activate(); // relies on that activate() will call updateGeometry()
+        }
+        break;
+    case QEvent::LayoutRequest:
+        activate();
+        break;
+    case QEvent::LayoutDirectionChange:
+        invalidate();
+        break;
+    default:
+        break;
+    }
+}
+
+/*!
+    \fn virtual int QGraphicsLayout::count() const = 0
+
+    This pure virtual function must be reimplemented in a subclass of
+    QGraphicsLayout to return the number of items in the layout.
+
+    The subclass is free to decide how to store the items.
+
+    \sa itemAt(), removeAt()
+*/
+
+/*!
+    \fn virtual QGraphicsLayoutItem *QGraphicsLayout::itemAt(int i) const = 0
+
+    This pure virtual function must be reimplemented in a subclass of
+    QGraphicsLayout to return a pointer to the item at index \a i. The
+    reimplementation can assume that \a i is valid (i.e., it respects the
+    value of count()).
+
+    The subclass is free to decide how to store the items.
+
+    \sa count(), removeAt()
+*/
+
+/*!
+    \fn virtual void QGraphicsLayout::removeAt(int index) = 0
+
+    This pure virtual function must be reimplemented in a subclass of
+    QGraphicsLayout to remove the item at \a index. The
+    reimplementation can assume that \a index is valid (i.e., it
+    respects the value of count()).
+
+    The implementation must ensure that the parentLayoutItem() of
+    the removed item does not point to this layout, since the item is
+    considered to be removed from the layout hierarchy.
+
+    If the layout is to be reused between applications, we recommend
+    that the layout deletes the item, but the graphics view framework
+    does not depend on this.
+
+    The subclass is free to decide how to store the items.
+
+    \sa itemAt(), count()
+*/
+
+QT_END_NAMESPACE
+
+#endif //QT_NO_GRAPHICSVIEW
diff --git a/src/gui/graphicsview/qgraphicslayout.h b/src/gui/graphicsview/qgraphicslayout.h
new file mode 100644
index 0000000..fad6c3bb
--- /dev/null
+++ b/src/gui/graphicsview/qgraphicslayout.h
@@ -0,0 +1,95 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QGRAPHICSLAYOUT_H
+#define QGRAPHICSLAYOUT_H
+
+#include <QtGui/qgraphicslayoutitem.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Gui)
+
+#if !defined(QT_NO_GRAPHICSVIEW) || (QT_EDITION & QT_MODULE_GRAPHICSVIEW) != QT_MODULE_GRAPHICSVIEW
+
+class QGraphicsLayoutPrivate;
+class QGraphicsLayoutItem;
+class QGraphicsWidget;
+
+class Q_GUI_EXPORT QGraphicsLayout : public QGraphicsLayoutItem
+{
+public:
+    QGraphicsLayout(QGraphicsLayoutItem *parent = 0);
+    ~QGraphicsLayout();
+
+    void setContentsMargins(qreal left, qreal top, qreal right, qreal bottom);
+    void getContentsMargins(qreal *left, qreal *top, qreal *right, qreal *bottom) const;
+
+    void activate();
+    bool isActivated() const;
+    virtual void invalidate();
+    virtual void updateGeometry();
+
+    virtual void widgetEvent(QEvent *e);
+
+    virtual int count() const = 0;
+    virtual QGraphicsLayoutItem *itemAt(int i) const = 0;
+    virtual void removeAt(int index) = 0;
+
+protected:
+    QGraphicsLayout(QGraphicsLayoutPrivate &, QGraphicsLayoutItem *);
+
+private:
+    Q_DISABLE_COPY(QGraphicsLayout)
+    Q_DECLARE_PRIVATE(QGraphicsLayout)
+    friend class QGraphicsWidget;
+};
+
+#endif
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif
+
diff --git a/src/gui/graphicsview/qgraphicslayout_p.cpp b/src/gui/graphicsview/qgraphicslayout_p.cpp
new file mode 100644
index 0000000..f76f4dd
--- /dev/null
+++ b/src/gui/graphicsview/qgraphicslayout_p.cpp
@@ -0,0 +1,198 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qglobal.h"
+
+#ifndef QT_NO_GRAPHICSVIEW
+
+#include "qgraphicslayout_p.h"
+#include "qgraphicslayout.h"
+#include "qgraphicswidget.h"
+#include "qapplication.h"
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    \internal
+
+    \a mw is the new parent. all items in the layout will be a child of \a mw.
+ */
+void QGraphicsLayoutPrivate::reparentChildItems(QGraphicsItem *newParent)
+{
+    Q_Q(QGraphicsLayout);
+    int n =  q->count();
+    //bool mwVisible = mw && mw->isVisible();
+    for (int i = 0; i < n; ++i) {
+        QGraphicsLayoutItem *layoutChild = q->itemAt(i);
+        if (!layoutChild) {
+            // Skip stretch items
+            continue;
+        }
+        if (layoutChild->isLayout()) {
+            QGraphicsLayout *l = static_cast<QGraphicsLayout*>(layoutChild);
+            l->d_func()->reparentChildItems(newParent);
+        } else if (QGraphicsItem *itemChild = layoutChild->graphicsItem()){
+            QGraphicsItem *childParent = itemChild->parentItem();
+#ifdef QT_DEBUG
+            if (childParent && childParent != newParent && itemChild->isWidget() && qt_graphicsLayoutDebug()) {
+                QGraphicsWidget *w = static_cast<QGraphicsWidget*>(layoutChild);
+                qWarning("QGraphicsLayout::addChildLayout: widget %s \"%s\" in wrong parent; moved to correct parent",
+                         w->metaObject()->className(), w->objectName().toLocal8Bit().constData());
+            }
+#endif
+            if (childParent != newParent)
+                itemChild->setParentItem(newParent);
+        }
+    }
+}
+
+void QGraphicsLayoutPrivate::getMargin(qreal *result, qreal userMargin, QStyle::PixelMetric pm) const
+{
+    if (!result)
+        return;
+    Q_Q(const QGraphicsLayout);
+
+    QGraphicsLayoutItem *parent = q->parentLayoutItem();
+    if (userMargin >= 0.0) {
+        *result = userMargin;
+    } else if (!parent) {
+        *result = 0.0;
+    } else if (parent->isLayout()) {    // sublayouts have 0 margin by default
+        *result = 0.0;
+    } else {
+        *result = 0.0;
+        if (QGraphicsItem *layoutParentItem = parentItem()) {
+            if (layoutParentItem->isWidget())
+                *result = (qreal)static_cast<QGraphicsWidget*>(layoutParentItem)->style()->pixelMetric(pm, 0);
+        }
+    }
+}
+
+Qt::LayoutDirection QGraphicsLayoutPrivate::visualDirection() const
+{
+    if (QGraphicsItem *maybeWidget = parentItem()) {
+        if (maybeWidget->isWidget())
+            return static_cast<QGraphicsWidget*>(maybeWidget)->layoutDirection();
+    }
+    return QApplication::layoutDirection();
+}
+
+static bool removeLayoutItemFromLayout(QGraphicsLayout *lay, QGraphicsLayoutItem *layoutItem)
+{
+    if (!lay)
+        return false;
+
+    QGraphicsLayoutItem *child;
+    for (int i = 0; (child = lay->itemAt(i)); ++i) {
+        if (child && child->isLayout()) {
+            if (removeLayoutItemFromLayout(static_cast<QGraphicsLayout*>(child), layoutItem))
+                return true;
+        } else if (child == layoutItem) {
+            lay->removeAt(i);
+            return true;
+        }
+    }
+    return false;
+}
+
+/*!
+    \internal
+
+    This function is called from subclasses to add a layout item \a layoutItem 
+    to a layout.
+
+    It takes care of automatically reparenting graphics items, if needed.
+
+    If \a layoutItem is a  is already in a layout, it will remove it  from that layout.
+    
+*/
+void QGraphicsLayoutPrivate::addChildLayoutItem(QGraphicsLayoutItem *layoutItem)
+{
+    Q_Q(QGraphicsLayout);
+    if (QGraphicsLayoutItem *maybeLayout = layoutItem->parentLayoutItem()) {
+        if (maybeLayout->isLayout())
+            removeLayoutItemFromLayout(static_cast<QGraphicsLayout*>(maybeLayout), layoutItem);
+    }    
+    layoutItem->setParentLayoutItem(q);
+    if (layoutItem->isLayout()) {
+        if (QGraphicsItem *parItem = parentItem()) {
+            static_cast<QGraphicsLayout*>(layoutItem)->d_func()->reparentChildItems(parItem);
+        }
+    } else {
+        if (QGraphicsItem *item = layoutItem->graphicsItem()) {        
+            QGraphicsItem *newParent = parentItem();
+            QGraphicsItem *oldParent = item->parentItem();
+            if (oldParent == newParent || !newParent)
+                return;
+
+#ifdef QT_DEBUG
+            if (oldParent && item->isWidget()) {
+                QGraphicsWidget *w = static_cast<QGraphicsWidget*>(item);
+                qWarning("QGraphicsLayout::addChildLayoutItem: %s \"%s\" in wrong parent; moved to correct parent",
+                    w->metaObject()->className(), w->objectName().toLocal8Bit().constData());
+            }
+#endif
+
+            item->setParentItem(newParent);
+        }
+    }
+}
+
+void QGraphicsLayoutPrivate::activateRecursive(QGraphicsLayoutItem *item)
+{
+    if (item->isLayout()) {
+        QGraphicsLayout *layout = static_cast<QGraphicsLayout *>(item);
+        if (layout->d_func()->activated)
+            layout->invalidate();
+        
+        for (int i = layout->count() - 1; i >= 0; --i) {
+            QGraphicsLayoutItem *childItem = layout->itemAt(i);
+            if (childItem)
+                activateRecursive(childItem);
+        }
+        layout->d_func()->activated = true;
+    }
+}
+
+
+QT_END_NAMESPACE
+        
+#endif //QT_NO_GRAPHICSVIEW
diff --git a/src/gui/graphicsview/qgraphicslayout_p.h b/src/gui/graphicsview/qgraphicslayout_p.h
new file mode 100644
index 0000000..a8895de
--- /dev/null
+++ b/src/gui/graphicsview/qgraphicslayout_p.h
@@ -0,0 +1,103 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QGRAPHICSLAYOUT_P_H
+#define QGRAPHICSLAYOUT_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of qapplication_*.cpp, qwidget*.cpp and qfiledialog.cpp.  This header
+// file may change from version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtCore/qglobal.h>
+
+#if !defined(QT_NO_GRAPHICSVIEW) || (QT_EDITION & QT_MODULE_GRAPHICSVIEW) != QT_MODULE_GRAPHICSVIEW
+
+#include "qgraphicslayout.h"
+#include "qgraphicslayoutitem_p.h"
+#include <QtGui/qstyle.h>
+
+QT_BEGIN_NAMESPACE
+
+class QGraphicsLayoutItem;
+class QGraphicsWidget;
+
+#ifdef QT_DEBUG
+inline bool qt_graphicsLayoutDebug()
+{
+    static int checked_env = -1;
+    if(checked_env == -1)
+        checked_env = !!qgetenv("QT_GRAPHICSLAYOUT_DEBUG").toInt();
+    return checked_env;
+}
+#endif
+
+class Q_AUTOTEST_EXPORT QGraphicsLayoutPrivate : public QGraphicsLayoutItemPrivate
+{
+    Q_DECLARE_PUBLIC(QGraphicsLayout)
+
+public:
+    QGraphicsLayoutPrivate() : QGraphicsLayoutItemPrivate(0, true), left(-1.0), top(-1.0), right(-1.0), bottom(-1.0), 
+        activated(true) { }
+
+    void reparentChildItems(QGraphicsItem *newParent);
+    void getMargin(qreal *result, qreal userMargin, QStyle::PixelMetric pm) const;
+    Qt::LayoutDirection visualDirection() const;
+
+    void addChildLayoutItem(QGraphicsLayoutItem *item);
+    void activateRecursive(QGraphicsLayoutItem *item);
+
+    qreal left, top, right, bottom;
+    bool activated;
+};
+
+
+QT_END_NAMESPACE
+        
+#endif //QT_NO_GRAPHICSVIEW
+
+#endif
diff --git a/src/gui/graphicsview/qgraphicslayoutitem.cpp b/src/gui/graphicsview/qgraphicslayoutitem.cpp
new file mode 100644
index 0000000..0ea7692
--- /dev/null
+++ b/src/gui/graphicsview/qgraphicslayoutitem.cpp
@@ -0,0 +1,852 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qglobal.h"
+
+#ifndef QT_NO_GRAPHICSVIEW
+
+#include "qgraphicslayout.h"
+#include "qgraphicsscene.h"
+#include "qgraphicslayoutitem.h"
+#include "qgraphicslayoutitem_p.h"
+#include "qwidget.h"
+
+#include <QtDebug>
+
+QT_BEGIN_NAMESPACE
+
+/*
+    COMBINE_SIZE() is identical to combineSize(), except that it
+    doesn't evaluate 'size' unless necessary.
+*/
+#define COMBINE_SIZE(result, size) \
+    do { \
+        if ((result).width() < 0 || (result).height() < 0) \
+            combineSize((result), (size)); \
+    } while (false)
+
+static void combineSize(QSizeF &result, const QSizeF &size)
+{
+    if (result.width() < 0)
+        result.setWidth(size.width());
+    if (result.height() < 0)
+        result.setHeight(size.height());
+}
+
+static void boundSize(QSizeF &result, const QSizeF &size)
+{
+    if (size.width() >= 0 && size.width() < result.width())
+        result.setWidth(size.width());
+    if (size.height() >= 0 && size.height() < result.height())
+        result.setHeight(size.height());
+}
+
+static void expandSize(QSizeF &result, const QSizeF &size)
+{
+    if (size.width() >= 0 && size.width() > result.width())
+        result.setWidth(size.width());
+    if (size.height() >= 0 && size.height() > result.height())
+        result.setHeight(size.height());
+}
+
+static void normalizeHints(qreal &minimum, qreal &preferred, qreal &maximum, qreal &descent)
+{
+    if (minimum >= 0 && maximum >= 0 && minimum > maximum)
+        minimum = maximum;
+
+    if (preferred >= 0) {
+        if (minimum >= 0 && preferred < minimum) {
+            preferred = minimum;
+        } else if (maximum >= 0 && preferred > maximum) {
+            preferred = maximum;
+        }
+    }
+
+    if (minimum >= 0 && descent > minimum)
+        descent = minimum;
+}
+
+/*!
+    \internal
+*/
+QGraphicsLayoutItemPrivate::QGraphicsLayoutItemPrivate(QGraphicsLayoutItem *par, bool layout)
+    : parent(par), isLayout(layout), ownedByLayout(false), graphicsItem(0)
+{
+}
+
+/*!
+    \internal
+*/
+void QGraphicsLayoutItemPrivate::init()
+{
+    sizeHintCacheDirty = true; 
+    sizePolicy = QSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);
+}
+
+/*!
+    \internal
+*/
+QSizeF *QGraphicsLayoutItemPrivate::effectiveSizeHints(const QSizeF &constraint) const
+{
+    Q_Q(const QGraphicsLayoutItem);
+    if (!sizeHintCacheDirty && cachedConstraint == constraint)
+        return cachedSizeHints;
+
+    for (int i = 0; i < Qt::NSizeHints; ++i) {
+        cachedSizeHints[i] = constraint;
+        combineSize(cachedSizeHints[i], userSizeHints[i]);
+    }
+
+    QSizeF &minS = cachedSizeHints[Qt::MinimumSize];
+    QSizeF &prefS = cachedSizeHints[Qt::PreferredSize];
+    QSizeF &maxS = cachedSizeHints[Qt::MaximumSize];
+    QSizeF &descentS = cachedSizeHints[Qt::MinimumDescent];
+
+    normalizeHints(minS.rwidth(), prefS.rwidth(), maxS.rwidth(), descentS.rwidth());
+    normalizeHints(minS.rheight(), prefS.rheight(), maxS.rheight(), descentS.rheight());
+
+    // if the minimum, preferred and maximum sizes contradict each other
+    // (e.g. the minimum is larger than the maximum) we give priority to
+    // the maximum size, then the minimum size and finally the preferred size
+    COMBINE_SIZE(maxS, q->sizeHint(Qt::MaximumSize, maxS));
+    combineSize(maxS, QSizeF(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX));
+    expandSize(maxS, prefS);
+    expandSize(maxS, minS);
+    boundSize(maxS, QSizeF(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX));
+
+    COMBINE_SIZE(minS, q->sizeHint(Qt::MinimumSize, minS));
+    expandSize(minS, QSizeF(0, 0));
+    boundSize(minS, prefS);
+    boundSize(minS, maxS);
+
+    COMBINE_SIZE(prefS, q->sizeHint(Qt::PreferredSize, prefS));
+    expandSize(prefS, minS);
+    boundSize(prefS, maxS);
+
+    // Not supported yet
+    // COMBINE_SIZE(descentS, q->sizeHint(Qt::MinimumDescent, constraint));
+
+    cachedConstraint = constraint;
+    sizeHintCacheDirty = false;
+    return cachedSizeHints;
+}
+
+
+/*!
+    \internal
+
+    Returns the parent item of this layout, or 0 if this layout is
+    not installed on any widget.
+    
+    If this is the item that the layout is installed on, it will return "itself".
+
+    If the layout is a sub-layout, this function returns the parent
+    widget of the parent layout.
+    
+    Note that it will traverse up the layout item hierarchy instead of just calling
+    QGraphicsItem::parentItem(). This is on purpose.
+
+    \sa parent()
+*/
+QGraphicsItem *QGraphicsLayoutItemPrivate::parentItem() const
+{
+    Q_Q(const QGraphicsLayoutItem);
+
+    const QGraphicsLayoutItem *parent = q;
+    while (parent && parent->isLayout()) {
+        parent = parent->parentLayoutItem();
+    }
+    return parent ? parent->graphicsItem() : 0;
+}
+
+/*!
+    \class QGraphicsLayoutItem
+    \brief The QGraphicsLayoutItem class can be inherited to allow your custom
+    items to be managed by layouts.
+    \since 4.4
+    \ingroup multimedia
+    \ingroup graphicsview-api
+
+    QGraphicsLayoutItem is an abstract class that defines a set of virtual
+    functions describing sizes, size policies, and size hints for any object
+    arranged by QGraphicsLayout. The API contains functions relevant
+    for both the item itself and for the user of the item as most of
+    QGraphicsLayoutItem's functions are also part of the subclass' public API.
+
+    In most cases, existing layout-aware classes such as QGraphicsWidget and
+    QGraphicsLayout already provide the functionality you require. However,
+    subclassing these classes will enable you to create both graphical
+    elements that work well with layouts (QGraphicsWidget) or custom layouts
+    (QGraphicsLayout).
+
+    \section1 Subclassing QGraphicsLayoutItem
+
+    If you create a subclass of QGraphicsLayoutItem and reimplement its
+    virtual functions, you will enable the layout to resize and position your
+    item along with other QGraphicsLayoutItems including QGraphicsWidget
+    and QGraphicsLayout.
+
+    You can start by reimplementing important functions: the protected
+    sizeHint() function, as well as the public setGeometry()
+    function. If you want your items to be aware of immediate geometry
+    changes, you can also reimplement updateGeometry().
+
+    The geometry, size hint, and size policy affect the item's size and
+    position. Calling setGeometry() will always resize and reposition the item
+    immediately. Normally, this function is called by QGraphicsLayout after
+    the layout has been activated, but it can also be called by the item's user
+    at any time. 
+
+    The sizeHint() function returns the item' minimum, preferred and maximum
+    size hints. You can override these properties by calling setMinimumSize(),
+    setPreferredSize() or setMaximumSize(). You can also use functions such as
+    setMinimumWidth() or setMaximumHeight() to set only the width or height
+    component if desired.
+
+    The effectiveSizeHint() function, on the other hand, returns a size hint
+    for any given Qt::SizeHint, and guarantees that the returned size is bound
+    to the minimum and maximum sizes and size hints. You can set the item's
+    vertical and horizontal size policy by calling setSizePolicy(). The
+    sizePolicy property is used by the layout system to describe how this item
+    prefers to grow or shrink.
+
+    \section1 Nesting QGraphicsLayoutItems
+
+    QGraphicsLayoutItems can be nested within other QGraphicsLayoutItems,
+    similar to layouts that can contain sublayouts. This is done either by
+    passing a QGraphicsLayoutItem pointer to QGraphicsLayoutItem's
+    protected constructor, or by calling setParentLayoutItem(). The
+    parentLayoutItem() function returns a pointer to the item's layoutItem
+    parent. If the item's parent is 0 or if the the parent does not inherit
+    from QGraphicsItem, the parentLayoutItem() function then returns 0.
+    isLayout() returns true if the QGraphicsLayoutItem subclass is itself a
+    layout, or false otherwise.
+
+    Qt uses QGraphicsLayoutItem to provide layout functionality in the
+    \l{The Graphics View Framework}, but in the future its use may spread
+    throughout Qt itself.
+
+    \sa QGraphicsWidget, QGraphicsLayout, QGraphicsLinearLayout,
+    QGraphicsGridLayout
+*/
+
+/*!
+    Constructs the QGraphicsLayoutItem object. \a parent becomes the object's
+    parent. If \a isLayout is true the item is a layout, otherwise
+    \a isLayout is false.
+*/
+QGraphicsLayoutItem::QGraphicsLayoutItem(QGraphicsLayoutItem *parent, bool isLayout)
+    : d_ptr(new QGraphicsLayoutItemPrivate(parent, isLayout))
+{
+    Q_D(QGraphicsLayoutItem);
+    d->init();
+    d->q_ptr = this;
+}
+
+/*!
+    \internal
+*/
+QGraphicsLayoutItem::QGraphicsLayoutItem(QGraphicsLayoutItemPrivate &dd)
+    : d_ptr(&dd)
+{
+    Q_D(QGraphicsLayoutItem);
+    d->q_ptr = this;
+}
+
+/*!
+    Destroys the QGraphicsLayoutItem object.
+*/
+QGraphicsLayoutItem::~QGraphicsLayoutItem()
+{
+    QGraphicsLayoutItem *parentLI = parentLayoutItem();
+    if (parentLI && parentLI->isLayout()) {
+        QGraphicsLayout *lay = static_cast<QGraphicsLayout*>(parentLI);
+        // this is not optimal
+        for (int i = lay->count() - 1; i >= 0; --i) {
+            if (lay->itemAt(i) == this) {
+                lay->removeAt(i);
+                break;
+            }
+        }
+    }
+    delete d_ptr;
+}
+
+/*!
+    \fn virtual QSizeF QGraphicsLayoutItem::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const = 0;
+
+    This pure virtual function returns the size hint for \a which of the
+    QGraphicsLayoutItem, using the width or height of \a constraint to
+    constrain the output.
+
+    Reimplement this function in a subclass of QGraphicsLayoutItem to
+    provide the necessary size hints for your items.
+
+    \sa effectiveSizeHint()
+*/
+
+/*!
+    Sets the size policy to \a policy. The size policy describes how the item
+    should grow horizontally and vertically when arranged in a layout.
+
+    QGraphicsLayoutItem's default size policy is (QSizePolicy::Fixed,
+    QSizePolicy::Fixed, QSizePolicy::DefaultType), but it is common for
+    subclasses to change the default. For example, QGraphicsWidget defaults
+    to (QSizePolicy::Preferred, QSizePolicy::Preferred,
+    QSizePolicy::DefaultType).
+
+    \sa sizePolicy(), QWidget::sizePolicy()
+*/
+void QGraphicsLayoutItem::setSizePolicy(const QSizePolicy &policy)
+{
+    Q_D(QGraphicsLayoutItem);
+    if (d->sizePolicy == policy)
+        return;
+    d->sizePolicy = policy;
+    updateGeometry();
+}
+
+/*!
+    \overload
+
+    This function is equivalent to calling
+    setSizePolicy(QSizePolicy(\a hPolicy, \a vPolicy, \a controlType)).
+
+    \sa sizePolicy(), QWidget::sizePolicy()
+*/
+void QGraphicsLayoutItem::setSizePolicy(QSizePolicy::Policy hPolicy,
+                                        QSizePolicy::Policy vPolicy,
+                                        QSizePolicy::ControlType controlType)
+{
+    setSizePolicy(QSizePolicy(hPolicy, vPolicy, controlType));
+}
+
+/*!
+    Returns the current size policy. 
+
+    \sa setSizePolicy(), QWidget::sizePolicy()
+*/
+QSizePolicy QGraphicsLayoutItem::sizePolicy() const
+{
+    Q_D(const QGraphicsLayoutItem);
+    return d->sizePolicy;
+}
+
+/*!
+    Sets the minimum size to \a size. This property overrides sizeHint() for
+    Qt::MinimumSize and ensures that effectiveSizeHint() will never return
+    a size smaller than \a size. In order to unset the minimum size, use an
+    invalid size.
+
+    \sa minimumSize(), maximumSize(), preferredSize(), Qt::MinimumSize,
+    sizeHint(), setMinimumWidth(), setMinimumHeight()
+*/
+void QGraphicsLayoutItem::setMinimumSize(const QSizeF &size)
+{
+    Q_D(QGraphicsLayoutItem);
+    if (size == d->userSizeHints[Qt::MinimumSize])
+        return;
+
+    d->userSizeHints[Qt::MinimumSize] = size;
+    updateGeometry();
+}
+
+/*!
+    \fn QGraphicsLayoutItem::setMinimumSize(qreal w, qreal h)
+
+    This convenience function is equivalent to calling
+    setMinimumSize(QSizeF(\a w, \a h)).
+
+    \sa minimumSize(), setMaximumSize(), setPreferredSize(), sizeHint()
+*/
+
+/*!
+    Returns the minimum size.
+
+    \sa setMinimumSize(), preferredSize(), maximumSize(), Qt::MinimumSize,
+    sizeHint()
+*/
+QSizeF QGraphicsLayoutItem::minimumSize() const
+{
+    return effectiveSizeHint(Qt::MinimumSize);
+}
+
+/*!
+    Sets the minimum width to \a width.
+
+    \sa minimumWidth(), setMinimumSize(), minimumSize()
+*/
+void QGraphicsLayoutItem::setMinimumWidth(qreal width)
+{
+    Q_D(QGraphicsLayoutItem);
+    qreal &userSizeHint = d->userSizeHints[Qt::MinimumSize].rwidth();
+    if (width == userSizeHint)
+        return;
+    userSizeHint = width;
+    updateGeometry();
+}
+
+/*!
+    Sets the minimum height to \a height.
+
+    \sa minimumHeight(), setMinimumSize(), minimumSize()
+*/
+void QGraphicsLayoutItem::setMinimumHeight(qreal height)
+{
+    Q_D(QGraphicsLayoutItem);
+    qreal &userSizeHint = d->userSizeHints[Qt::MinimumSize].rheight();
+    if (height == userSizeHint)
+        return;
+    userSizeHint = height;
+    updateGeometry();
+}
+
+
+/*!
+    Sets the preferred size to \a size. This property overrides sizeHint() for
+    Qt::PreferredSize and provides the default value for effectiveSizeHint().
+    In order to unset the preferred size, use an invalid size.
+
+    \sa preferredSize(), minimumSize(), maximumSize(), Qt::PreferredSize,
+    sizeHint()
+*/
+void QGraphicsLayoutItem::setPreferredSize(const QSizeF &size)
+{
+    Q_D(QGraphicsLayoutItem);
+    if (size == d->userSizeHints[Qt::PreferredSize])
+        return;
+
+    d->userSizeHints[Qt::PreferredSize] = size;
+    updateGeometry();
+}
+
+/*!
+    \fn QGraphicsLayoutItem::setPreferredSize(qreal w, qreal h)
+
+    This convenience function is equivalent to calling
+    setPreferredSize(QSizeF(\a w, \a h)).
+
+    \sa preferredSize(), setMaximumSize(), setMinimumSize(), sizeHint()
+*/
+
+/*!
+    Returns the preferred size.
+
+    \sa setPreferredSize(), minimumSize(), maximumSize(), Qt::PreferredSize,
+    sizeHint()
+*/
+QSizeF QGraphicsLayoutItem::preferredSize() const
+{
+    return effectiveSizeHint(Qt::PreferredSize);
+}
+
+/*!
+    Sets the preferred height to \a height.
+
+    \sa preferredWidth(), setPreferredSize(), preferredSize()
+*/
+void QGraphicsLayoutItem::setPreferredHeight(qreal height)
+{
+    Q_D(QGraphicsLayoutItem);
+    qreal &userSizeHint = d->userSizeHints[Qt::PreferredSize].rheight();
+    if (height == userSizeHint)
+        return;
+    userSizeHint = height;
+    updateGeometry();
+}
+
+/*!
+    Sets the preferred width to \a width.
+
+    \sa preferredHeight(), setPreferredSize(), preferredSize()
+*/
+void QGraphicsLayoutItem::setPreferredWidth(qreal width)
+{
+    Q_D(QGraphicsLayoutItem);
+    qreal &userSizeHint = d->userSizeHints[Qt::PreferredSize].rwidth();
+    if (width == userSizeHint)
+        return;
+    userSizeHint = width;
+    updateGeometry();
+}
+
+/*!
+    Sets the maximum size to \a size. This property overrides sizeHint() for
+    Qt::MaximumSize and ensures that effectiveSizeHint() will never return a
+    size larger than \a size. In order to unset the maximum size, use an
+    invalid size.
+
+    \sa maximumSize(), minimumSize(), preferredSize(), Qt::MaximumSize,
+    sizeHint()
+*/
+void QGraphicsLayoutItem::setMaximumSize(const QSizeF &size)
+{
+    Q_D(QGraphicsLayoutItem);
+    if (size == d->userSizeHints[Qt::MaximumSize])
+        return;
+
+    d->userSizeHints[Qt::MaximumSize] = size;
+    updateGeometry();
+}
+
+/*!
+    \fn QGraphicsLayoutItem::setMaximumSize(qreal w, qreal h)
+
+    This convenience function is equivalent to calling
+    setMaximumSize(QSizeF(\a w, \a h)).
+
+    \sa maximumSize(), setMinimumSize(), setPreferredSize(), sizeHint()
+*/
+
+/*!
+    Returns the maximum size.
+
+    \sa setMaximumSize(), minimumSize(), preferredSize(), Qt::MaximumSize,
+    sizeHint()
+*/
+QSizeF QGraphicsLayoutItem::maximumSize() const
+{
+    return effectiveSizeHint(Qt::MaximumSize);
+}
+
+/*!
+    Sets the maximum width to \a width.
+
+    \sa maximumWidth(), setMaximumSize(), maximumSize()
+*/
+void QGraphicsLayoutItem::setMaximumWidth(qreal width)
+{
+    Q_D(QGraphicsLayoutItem);
+    qreal &userSizeHint = d->userSizeHints[Qt::MaximumSize].rwidth();
+    if (width == userSizeHint)
+        return;
+    userSizeHint = width;
+    updateGeometry();
+}
+
+/*!
+    Sets the maximum height to \a height.
+
+    \sa maximumHeight(), setMaximumSize(), maximumSize()
+*/
+void QGraphicsLayoutItem::setMaximumHeight(qreal height)
+{
+    Q_D(QGraphicsLayoutItem);
+    qreal &userSizeHint = d->userSizeHints[Qt::MaximumSize].rheight();
+    if (height == userSizeHint)
+        return;
+    userSizeHint = height;
+    updateGeometry();
+}
+
+/*!
+    \fn qreal QGraphicsLayoutItem::minimumWidth() const
+
+    Returns the minimum width.
+
+    \sa setMinimumWidth(), setMinimumSize(), minimumSize()
+*/
+
+/*!
+    \fn qreal QGraphicsLayoutItem::minimumHeight() const
+
+    Returns the minimum height.
+
+    \sa setMinimumHeight(), setMinimumSize(), minimumSize()
+*/
+
+/*!
+    \fn qreal QGraphicsLayoutItem::preferredWidth() const
+
+    Returns the preferred width.
+
+    \sa setPreferredWidth(), setPreferredSize(), preferredSize()
+*/
+
+/*!
+    \fn qreal QGraphicsLayoutItem::preferredHeight() const
+
+    Returns the preferred height.
+
+    \sa setPreferredHeight(), setPreferredSize(), preferredSize()
+*/
+
+/*!
+    \fn qreal QGraphicsLayoutItem::maximumWidth() const
+
+    Returns the maximum width.
+
+    \sa setMaximumWidth(), setMaximumSize(), maximumSize()
+*/
+
+/*!
+    \fn qreal QGraphicsLayoutItem::maximumHeight() const
+
+    Returns the maximum height.
+
+    \sa setMaximumHeight(), setMaximumSize(), maximumSize()
+*/
+
+/*!
+    \fn virtual void QGraphicsLayoutItem::setGeometry(const QRectF &rect) = 0
+
+    This pure virtual function sets the geometry of the QGraphicsLayoutItem to
+    \a rect, which is in parent coordinates (e.g., the top-left corner of \a rect
+    is equivalent to the item's position in parent coordinates).
+
+    Reimplement this function in a subclass of QGraphicsLayoutItem to enable
+    your item to receive geometry updates.
+
+    If \a rect is outside of the bounds of minimumSize and maximumSize, it
+    will be adjusted to its closest size so that it is within the legal
+    bounds.
+
+    \sa geometry()
+*/
+void QGraphicsLayoutItem::setGeometry(const QRectF &rect)
+{
+    Q_D(QGraphicsLayoutItem);
+    QSizeF effectiveSize = rect.size().expandedTo(effectiveSizeHint(Qt::MinimumSize))
+                                .boundedTo(effectiveSizeHint(Qt::MaximumSize));
+    d->geom = QRectF(rect.topLeft(), effectiveSize);
+}
+
+/*!
+    \fn QRectF QGraphicsLayoutItem::geometry() const
+
+    Returns the item's geometry (e.g., position and size) as a
+    QRectF. This function is equivalent to QRectF(pos(), size()).
+
+    \sa setGeometry()
+*/
+QRectF QGraphicsLayoutItem::geometry() const
+{
+    Q_D(const QGraphicsLayoutItem);
+    return d->geom;
+}
+
+/*!
+    This virtual function provides the \a left, \a top, \a right and \a bottom
+    contents margins for this QGraphicsLayoutItem. The default implementation
+    assumes all contents margins are 0. The parameters point to values stored
+    in qreals. If any of the pointers is 0, that value will not be updated.
+
+    \sa QGraphicsWidget::setContentsMargins()
+*/
+void QGraphicsLayoutItem::getContentsMargins(qreal *left, qreal *top, qreal *right, qreal *bottom) const
+{
+    if (left)
+        *left = 0;
+    if (top)
+        *top = 0;
+    if (right)
+        *right = 0;
+    if (bottom)
+        *bottom = 0;
+}
+
+/*!
+    Returns the contents rect in local coordinates.
+
+    The contents rect defines the subrectangle used by an associated layout
+    when arranging subitems. This function is a convenience function that
+    adjusts the item's geometry() by its contents margins. Note that
+    getContentsMargins() is a virtual function that you can reimplement to
+    return the item's contents margins.
+
+    \sa getContentsMargins(), geometry()
+*/
+QRectF QGraphicsLayoutItem::contentsRect() const
+{
+    qreal left, top, right, bottom;
+    getContentsMargins(&left, &top, &right, &bottom);
+    return QRectF(QPointF(), geometry().size()).adjusted(+left, +top, -right, -bottom);
+}
+
+/*!
+    Returns the effective size hint for this QGraphicsLayoutItem.
+
+    \a which is the size hint in question.
+    \a constraint is an optional argument that defines a special constrain
+    when calculating the effective size hint. By default, \a constraint is
+    QSizeF(-1, -1), which means there is no constraint to the size hint.
+
+    If you want to specify the widget's size hint for a given width or height,
+    you can provide the fixed dimension in \a constraint. This is useful for
+    widgets that can grow only either vertically or horizontally, and need to
+    set either their width or their height to a special value.
+
+    For example, a text paragraph item fit into a column width of 200 may
+    grow vertically. You can pass QSizeF(200, -1) as a constraint to get a
+    suitable minimum, preferred and maximum height).
+
+    You can adjust the effective size hint by reimplementing sizeHint()
+    in a QGraphicsLayoutItem subclass, or by calling one of the following
+    functions: setMinimumSize(), setPreferredSize, or setMaximumSize()
+    (or a combination of both).
+
+    This function caches each of the size hints and guarantees that
+    sizeHint() will be called only once for each value of \a which - unless
+    \a constraint is not specified and updateGeometry() has been called.
+
+    \sa sizeHint()
+*/
+QSizeF QGraphicsLayoutItem::effectiveSizeHint(Qt::SizeHint which, const QSizeF &constraint) const
+{
+    // ### should respect size policy???
+    return d_ptr->effectiveSizeHints(constraint)[which];
+}
+
+/*!
+    This virtual function discards any cached size hint information. You
+    should always call this function if you change the return value of the
+    sizeHint() function. Subclasses must always call the base implementation
+    when reimplementing this function.
+
+    \sa effectiveSizeHint()
+*/
+void QGraphicsLayoutItem::updateGeometry()
+{ 
+    Q_D(QGraphicsLayoutItem);
+    d->sizeHintCacheDirty = true;
+}
+
+/*!
+    Returns the parent of this QGraphicsLayoutItem, or 0 if there is no parent,
+    or if the parent does not inherit from QGraphicsLayoutItem
+    (QGraphicsLayoutItem is often used through multiple inheritance with
+    QObject-derived classes).
+
+    \sa setParentLayoutItem()
+*/
+QGraphicsLayoutItem *QGraphicsLayoutItem::parentLayoutItem() const
+{
+    return d_func()->parent;
+}
+
+/*!
+    Sets the parent of this QGraphicsLayoutItem to \a parent.
+
+    \sa parentLayoutItem()
+*/
+void QGraphicsLayoutItem::setParentLayoutItem(QGraphicsLayoutItem *parent)
+{ 
+    d_func()->parent = parent;
+}
+
+/*!
+    Returns true if this QGraphicsLayoutItem is a layout (e.g., is inherited
+    by an object that arranges other QGraphicsLayoutItem objects); otherwise
+    returns false.
+
+    \sa QGraphicsLayout
+*/
+bool QGraphicsLayoutItem::isLayout() const
+{
+    return d_func()->isLayout;
+}
+
+/*!
+    Returns whether a layout should delete this item in its destructor.
+    If its true, then the layout will delete it. If its false, then it is
+    assumed that another object has the ownership of it, and the layout won't
+    delete this item.
+    
+    If the item inherits both QGraphicsItem and QGraphicsLayoutItem (such 
+    as QGraphicsWidget does) the item is really part of two ownership 
+    hierarchies. This property informs what the layout should do with its
+    child items when it is destructed. In the case of QGraphicsWidget, it
+    is preferred that when the layout is deleted it won't delete its children 
+    (since they are also part of the graphics item hierarchy).
+
+    By default this value is initialized to false in QGraphicsLayoutItem,
+    but it is overridden by QGraphicsLayout to return true. This is because
+    QGraphicsLayout is not normally part of the QGraphicsItem hierarchy, so the
+    parent layout should delete it.
+    Subclasses might override this default behaviour by calling
+    setOwnedByLayout(true).
+
+    \sa setOwnedByLayout()
+*/
+bool QGraphicsLayoutItem::ownedByLayout() const
+{
+    return d_func()->ownedByLayout;
+}
+/*!
+    Sets whether a layout should delete this item in its destructor or not.
+    \a ownership must be true to in order for the layout to delete it.
+    \sa ownedByLayout()
+*/
+void QGraphicsLayoutItem::setOwnedByLayout(bool ownership)
+{
+    d_func()->ownedByLayout = ownership;
+}
+
+/*!
+ * Returns the QGraphicsItem that this layout item represents.
+ * For QGraphicsWidget it will return itself. For custom items it can return an 
+ * aggregated value. 
+ * 
+ * \sa setGraphicsItem()
+ */
+QGraphicsItem *QGraphicsLayoutItem::graphicsItem() const
+{
+    return d_func()->graphicsItem;
+}
+
+/*!
+ * If the QGraphicsLayoutItem represents a QGraphicsItem, and it wants to take
+ * advantage of the automatic reparenting capabilities of QGraphicsLayout it
+ * should set this value.
+ * Note that if you delete \a item and not delete the layout item, you are 
+ * responsible of calling setGraphicsItem(0) in order to avoid having a 
+ * dangling pointer.
+ * 
+ * \sa graphicsItem()
+ */
+void QGraphicsLayoutItem::setGraphicsItem(QGraphicsItem *item)
+{
+    d_func()->graphicsItem = item;
+}
+
+QT_END_NAMESPACE
+        
+#endif //QT_NO_GRAPHICSVIEW
diff --git a/src/gui/graphicsview/qgraphicslayoutitem.h b/src/gui/graphicsview/qgraphicslayoutitem.h
new file mode 100644
index 0000000..31f5d90
--- /dev/null
+++ b/src/gui/graphicsview/qgraphicslayoutitem.h
@@ -0,0 +1,152 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QGRAPHICSLAYOUTITEM_H
+#define QGRAPHICSLAYOUTITEM_H
+
+#include <QtGui/qsizepolicy.h>
+#include <QtGui/qevent.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Gui)
+
+#if !defined(QT_NO_GRAPHICSVIEW) || (QT_EDITION & QT_MODULE_GRAPHICSVIEW) != QT_MODULE_GRAPHICSVIEW
+
+class QGraphicsLayoutItemPrivate;
+class QGraphicsItem;
+class Q_GUI_EXPORT QGraphicsLayoutItem
+{
+public:
+    QGraphicsLayoutItem(QGraphicsLayoutItem *parent = 0, bool isLayout = false);
+    virtual ~QGraphicsLayoutItem();
+
+    void setSizePolicy(const QSizePolicy &policy);
+    void setSizePolicy(QSizePolicy::Policy hPolicy, QSizePolicy::Policy vPolicy, QSizePolicy::ControlType controlType = QSizePolicy::DefaultType);
+    QSizePolicy sizePolicy() const;
+
+    void setMinimumSize(const QSizeF &size);
+    inline void setMinimumSize(qreal w, qreal h);
+    QSizeF minimumSize() const;
+    void setMinimumWidth(qreal width);
+    inline qreal minimumWidth() const;
+    void setMinimumHeight(qreal height);
+    inline qreal minimumHeight() const;
+
+    void setPreferredSize(const QSizeF &size);
+    inline void setPreferredSize(qreal w, qreal h);
+    QSizeF preferredSize() const;
+    void setPreferredWidth(qreal width);
+    inline qreal preferredWidth() const;
+    void setPreferredHeight(qreal height);
+    inline qreal preferredHeight() const;
+
+    void setMaximumSize(const QSizeF &size);
+    inline void setMaximumSize(qreal w, qreal h);
+    QSizeF maximumSize() const;
+    void setMaximumWidth(qreal width);
+    inline qreal maximumWidth() const;
+    void setMaximumHeight(qreal height);
+    inline qreal maximumHeight() const;
+
+    virtual void setGeometry(const QRectF &rect);
+    QRectF geometry() const;
+    virtual void getContentsMargins(qreal *left, qreal *top, qreal *right, qreal *bottom) const;
+    QRectF contentsRect() const;
+
+    QSizeF effectiveSizeHint(Qt::SizeHint which, const QSizeF &constraint = QSizeF()) const;
+
+    virtual void updateGeometry();  //### rename to sizeHintChanged()
+
+    QGraphicsLayoutItem *parentLayoutItem() const;
+    void setParentLayoutItem(QGraphicsLayoutItem *parent);
+
+    bool isLayout() const;
+    // ###Qt5: Make automatic reparenting work regardless of item/object/widget type.
+    QGraphicsItem *graphicsItem() const;
+    bool ownedByLayout() const;
+
+protected:
+    void setGraphicsItem(QGraphicsItem *item);
+    void setOwnedByLayout(bool ownedByLayout);
+    QGraphicsLayoutItem(QGraphicsLayoutItemPrivate &dd);
+
+    virtual QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint = QSizeF()) const = 0;
+    QGraphicsLayoutItemPrivate *d_ptr;
+
+private:
+    QSizeF *effectiveSizeHints(const QSizeF &constraint) const;
+    Q_DECLARE_PRIVATE(QGraphicsLayoutItem)
+    
+    friend class QGraphicsLayout;
+};
+
+inline void QGraphicsLayoutItem::setMinimumSize(qreal aw, qreal ah)
+{ setMinimumSize(QSizeF(aw, ah)); }
+inline void QGraphicsLayoutItem::setPreferredSize(qreal aw, qreal ah)
+{ setPreferredSize(QSizeF(aw, ah)); }
+inline void QGraphicsLayoutItem::setMaximumSize(qreal aw, qreal ah)
+{ setMaximumSize(QSizeF(aw, ah)); }
+
+inline qreal QGraphicsLayoutItem::minimumWidth() const
+{ return effectiveSizeHint(Qt::MinimumSize).width(); }
+inline qreal QGraphicsLayoutItem::minimumHeight() const
+{ return effectiveSizeHint(Qt::MinimumSize).height(); }
+
+inline qreal QGraphicsLayoutItem::preferredWidth() const
+{ return effectiveSizeHint(Qt::PreferredSize).width(); }
+inline qreal QGraphicsLayoutItem::preferredHeight() const
+{ return effectiveSizeHint(Qt::PreferredSize).height(); }
+
+inline qreal QGraphicsLayoutItem::maximumWidth() const
+{ return effectiveSizeHint(Qt::MaximumSize).width(); }
+inline qreal QGraphicsLayoutItem::maximumHeight() const
+{ return effectiveSizeHint(Qt::MaximumSize).height(); }
+
+#endif
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif
diff --git a/src/gui/graphicsview/qgraphicslayoutitem_p.h b/src/gui/graphicsview/qgraphicslayoutitem_p.h
new file mode 100644
index 0000000..fab0f39
--- /dev/null
+++ b/src/gui/graphicsview/qgraphicslayoutitem_p.h
@@ -0,0 +1,91 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QGRAPHICSLAYOUTITEM_P_H
+#define QGRAPHICSLAYOUTITEM_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of qapplication_*.cpp, qwidget*.cpp and qfiledialog.cpp.  This header
+// file may change from version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtCore/QSizeF>
+#include <QtGui/QSizePolicy>
+
+QT_BEGIN_NAMESPACE
+
+class QGraphicsLayoutItem;
+class Q_AUTOTEST_EXPORT QGraphicsLayoutItemPrivate
+{
+    Q_DECLARE_PUBLIC(QGraphicsLayoutItem)
+public:
+    virtual ~QGraphicsLayoutItemPrivate() {}
+    QGraphicsLayoutItemPrivate(QGraphicsLayoutItem *parent, bool isLayout);
+    void init();
+    QSizeF *effectiveSizeHints(const QSizeF &constraint) const;
+    QGraphicsItem *parentItem() const;
+
+    QSizePolicy sizePolicy;
+    QGraphicsLayoutItem *parent;
+
+    QSizeF userSizeHints[Qt::NSizeHints];
+    mutable QSizeF cachedSizeHints[Qt::NSizeHints];
+    mutable QSizeF cachedConstraint;
+
+    mutable quint32 sizeHintCacheDirty : 1;
+    quint32 isLayout : 1;
+    quint32 ownedByLayout : 1;
+
+    QGraphicsLayoutItem *q_ptr;
+    QRectF geom;
+    QGraphicsItem *graphicsItem;
+};
+
+QT_END_NAMESPACE
+
+#endif //QGRAPHICSLAYOUTITEM_P_H
+
diff --git a/src/gui/graphicsview/qgraphicslinearlayout.cpp b/src/gui/graphicsview/qgraphicslinearlayout.cpp
new file mode 100644
index 0000000..6a2d456
--- /dev/null
+++ b/src/gui/graphicsview/qgraphicslinearlayout.cpp
@@ -0,0 +1,547 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*!
+    \class QGraphicsLinearLayout
+    \brief The QGraphicsLinearLayout class provides a horizontal or vertical
+    layout for managing widgets in Graphics View.
+    \since 4.4
+    \ingroup multimedia
+    \ingroup graphicsview-api
+
+    The default orientation for a linear layout is Qt::Horizontal. You can
+    choose a vertical orientation either by calling setOrientation(), or by
+    passing Qt::Vertical to QGraphicsLinearLayout's constructor.
+
+    The most common way to use QGraphicsLinearLayout is to construct an object
+    on the heap with no parent, add widgets and layouts by calling addItem(),
+    and finally assign the layout to a widget by calling
+    QGraphicsWidget::setLayout().
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicslinearlayout.cpp 0
+
+    You can add widgets, layouts, stretches (addStretch(), insertStretch() or
+    setStretchFactor()), and spacings (setItemSpacing()) to a linear
+    layout. The layout takes ownership of the items. In some cases when the layout 
+    item also inherits from QGraphicsItem (such as QGraphicsWidget) there will be a
+    ambiguity in ownership because the layout item belongs to two ownership hierarchies.
+	See the documentation of QGraphicsLayoutItem::setOwnedByLayout() how to handle
+	this.
+	You can access each item in the layout by calling count() and itemAt(). Calling
+    removeAt() or removeItem() will remove an item from the layout, without
+    destroying it.
+
+    \section1 Size Hints and Size Policies in QGraphicsLinearLayout
+
+    QGraphicsLinearLayout respects each item's size hints and size policies,
+    and when the layout contains more space than the items can fill, each item
+    is arranged according to the layout's alignment for that item. You can set
+    an alignment for each item by calling setAlignment(), and check the
+    alignment for any item by calling alignment(). By default, items are
+    centered both vertically and horizontally.
+
+    \section1 Spacing within QGraphicsLinearLayout
+
+    Between the items, the layout distributes some space. The actual amount of
+    space depends on the managed widget's current style, but the common
+    spacing is 4. You can also set your own spacing by calling setSpacing(),
+    and get the current spacing value by calling spacing(). If you want to
+    configure individual spacing for your items, you can call setItemSpacing().
+
+    \section1 Stretch Factor in QGraphicsLinearLayout
+
+    You can assign a stretch factor to each item to control how much space it
+    will get compared to the other items. By default, two identical widgets
+    arranged in a linear layout will have the same size, but if the first
+    widget has a stretch factor of 1 and the second widget has a stretch
+    factor of 2, the first widget will get 1/3 of the available space, and the
+    second will get 2/3.
+
+    QGraphicsLinearLayout calculates the distribution of sizes by adding up
+    the stretch factors of all items, and then dividing the available space
+    accordingly. The default stretch factor is 0 for all items; a factor of 0
+    means the item does not have any defined stretch factor; effectively this
+    is the same as setting the stretch factor to 1. The stretch factor only
+    applies to the available space in the lengthwise direction of the layout
+    (following its orientation). If you want to control both the item's
+    horizontal and vertical stretch, you can use QGraphicsGridLayout instead.
+
+    \section1 QGraphicsLinearLayout Compared to Other Layouts
+
+    QGraphicsLinearLayout is very similar to QVBoxLayout and QHBoxLayout, but
+    in contrast to these classes, it is used to manage QGraphicsWidget and
+    QGraphicsLayout instead of QWidget and QLayout.
+
+    \sa QGraphicsGridLayout, QGraphicsWidget
+*/
+
+#include "qapplication.h"
+
+#ifndef QT_NO_GRAPHICSVIEW
+
+#include "qwidget.h"
+#include "qgraphicslayout_p.h"
+#include "qgraphicslayoutitem.h"
+#include "qgraphicslinearlayout.h"
+#include "qgraphicswidget.h"
+#include "qgridlayoutengine_p.h"
+#ifdef QT_DEBUG
+#include <QtCore/qdebug.h>
+#endif
+
+QT_BEGIN_NAMESPACE
+
+class QGraphicsLinearLayoutPrivate : public QGraphicsLayoutPrivate
+{
+public:
+    QGraphicsLinearLayoutPrivate(Qt::Orientation orientation) : orientation(orientation) { }
+
+    void removeGridItem(QGridLayoutItem *gridItem);
+    QLayoutStyleInfo styleInfo() const;
+    void fixIndex(int *index) const;
+    int gridRow(int index) const;
+    int gridColumn(int index) const;
+
+    Qt::Orientation orientation;
+    QGridLayoutEngine engine;
+};
+
+void QGraphicsLinearLayoutPrivate::removeGridItem(QGridLayoutItem *gridItem)
+{
+    int index = gridItem->firstRow(orientation);
+    engine.removeItem(gridItem);
+    engine.removeRow(index, orientation);
+}
+
+void QGraphicsLinearLayoutPrivate::fixIndex(int *index) const
+{
+    int count = engine.rowCount(orientation);
+    if (uint(*index) > uint(count))
+        *index = count;
+}
+
+int QGraphicsLinearLayoutPrivate::gridRow(int index) const
+{
+    if (orientation == Qt::Horizontal)
+        return 0;
+    return int(qMin(uint(index), uint(engine.rowCount())));
+}
+
+int QGraphicsLinearLayoutPrivate::gridColumn(int index) const
+{
+    if (orientation == Qt::Vertical)
+        return 0;
+    return int(qMin(uint(index), uint(engine.columnCount())));
+}
+
+QLayoutStyleInfo QGraphicsLinearLayoutPrivate::styleInfo() const
+{
+    static QWidget *wid = 0;
+    if (!wid)
+        wid = new QWidget;
+    QGraphicsItem *item = parentItem();
+    QStyle *style = (item && item->isWidget()) ? static_cast<QGraphicsWidget*>(item)->style() : qApp->style();
+    return QLayoutStyleInfo(style, wid);
+}
+
+/*!
+    Constructs a QGraphicsLinearLayout instance. You can pass the
+    \a orientation for the layout, either horizontal or vertical, and
+    \a parent is passed to QGraphicsLayout's constructor.
+*/
+QGraphicsLinearLayout::QGraphicsLinearLayout(Qt::Orientation orientation, QGraphicsLayoutItem *parent)
+    : QGraphicsLayout(*new QGraphicsLinearLayoutPrivate(orientation), parent)
+{
+}
+
+/*!
+    Constructs a QGraphicsLinearLayout instance using Qt::Horizontal
+    orientation. \a parent is passed to QGraphicsLayout's constructor.
+*/
+QGraphicsLinearLayout::QGraphicsLinearLayout(QGraphicsLayoutItem *parent)
+    : QGraphicsLayout(*new QGraphicsLinearLayoutPrivate(Qt::Horizontal), parent)
+{
+}
+
+/*!
+    Destroys the QGraphicsLinearLayout object.
+*/
+QGraphicsLinearLayout::~QGraphicsLinearLayout()
+{
+    for (int i = count() - 1; i >= 0; --i) {
+        QGraphicsLayoutItem *item = itemAt(i);
+        // The following lines can be removed, but this removes the item
+        // from the layout more efficiently than the implementation of 
+        // ~QGraphicsLayoutItem.
+        removeAt(i);
+        if (item) {
+            item->setParentLayoutItem(0);
+            if (item->ownedByLayout())
+                delete item;
+        }
+    }
+}
+
+/*!
+  Change the layout orientation to \a orientation. Changing the layout
+  orientation will automatically invalidate the layout.
+
+  \sa orientation()
+*/
+void QGraphicsLinearLayout::setOrientation(Qt::Orientation orientation)
+{
+    Q_D(QGraphicsLinearLayout);
+    if (orientation != d->orientation) {
+        d->engine.transpose();
+        d->orientation = orientation;
+        invalidate();
+    }
+}
+
+/*!
+  Returns the layout orientation.
+  \sa setOrientation()
+ */
+Qt::Orientation QGraphicsLinearLayout::orientation() const
+{
+    Q_D(const QGraphicsLinearLayout);
+    return d->orientation;
+}
+
+/*!
+    \fn void QGraphicsLinearLayout::addItem(QGraphicsLayoutItem *item)
+
+    This convenience function is equivalent to calling
+    insertItem(-1, \a item).
+*/
+
+/*!
+    \fn void QGraphicsLinearLayout::addStretch(int stretch)
+
+    This convenience function is equivalent to calling
+    insertStretch(-1, \a stretch).
+*/
+
+/*!
+    Inserts \a item into the layout at \a index, or before any item that is
+    currently at \a index.
+
+    \sa addItem(), itemAt(), insertStretch(), setItemSpacing()
+*/
+void QGraphicsLinearLayout::insertItem(int index, QGraphicsLayoutItem *item)
+{
+    Q_D(QGraphicsLinearLayout);
+    if (!item) {
+        qWarning("QGraphicsLinearLayout::insertItem: cannot insert null item");
+        return;
+    }
+    d->addChildLayoutItem(item);
+
+    Q_ASSERT(item);
+    d->fixIndex(&index);
+    d->engine.insertRow(index, d->orientation);
+    new QGridLayoutItem(&d->engine, item, d->gridRow(index), d->gridColumn(index));
+    invalidate();
+}
+
+/*!
+    Inserts a stretch of \a stretch at \a index, or before any item that is
+    currently at \a index.
+
+    \sa addStretch(), setStretchFactor(), setItemSpacing(), insertItem()
+*/
+void QGraphicsLinearLayout::insertStretch(int index, int stretch)
+{
+    Q_D(QGraphicsLinearLayout);
+    d->fixIndex(&index);
+    d->engine.insertRow(index, d->orientation);
+    d->engine.setRowStretchFactor(index, stretch, d->orientation);
+    invalidate();
+}
+
+/*!
+    Removes \a item from the layout without destroying it. Ownership of
+    \a item is transferred to the caller.
+
+    \sa removeAt(), insertItem()
+*/
+void QGraphicsLinearLayout::removeItem(QGraphicsLayoutItem *item)
+{
+    Q_D(QGraphicsLinearLayout);
+    if (QGridLayoutItem *gridItem = d->engine.findLayoutItem(item)) {
+        item->setParentLayoutItem(0);
+        d->removeGridItem(gridItem);
+        delete gridItem;
+        invalidate();
+    }
+}
+
+/*!
+    Removes the item at \a index without destroying it. Ownership of the item
+    is transferred to the caller.
+
+    \sa removeItem(), insertItem()
+*/
+void QGraphicsLinearLayout::removeAt(int index)
+{
+    Q_D(QGraphicsLinearLayout);
+    if (QGridLayoutItem *gridItem = d->engine.itemAt(d->gridRow(index), d->gridColumn(index))) {
+        if (QGraphicsLayoutItem *layoutItem = gridItem->layoutItem())
+            layoutItem->setParentLayoutItem(0);
+        d->removeGridItem(gridItem);
+        delete gridItem;
+        invalidate();
+    }
+}
+
+/*!
+  Sets the layout's spacing to \a spacing. Spacing refers to the
+  vertical and horizontal distances between items.
+
+   \sa setItemSpacing(), setStretchFactor(), QGraphicsGridLayout::setSpacing()
+*/
+void QGraphicsLinearLayout::setSpacing(qreal spacing)
+{
+    Q_D(QGraphicsLinearLayout);
+    if (spacing < 0) {
+        qWarning("QGraphicsLinearLayout::setSpacing: invalid spacing %g", spacing);
+        return;
+    }
+    d->engine.setSpacing(spacing, Qt::Horizontal | Qt::Vertical);
+    invalidate();
+}
+
+/*!
+  Returns the layout's spacing. Spacing refers to the
+  vertical and horizontal distances between items.
+
+  \sa setSpacing()
+ */
+qreal QGraphicsLinearLayout::spacing() const
+{
+    Q_D(const QGraphicsLinearLayout);
+    return d->engine.spacing(d->styleInfo(), d->orientation);
+}
+
+/*!
+    Sets the spacing after item at \a index to \a spacing.
+*/
+void QGraphicsLinearLayout::setItemSpacing(int index, qreal spacing)
+{
+    Q_D(QGraphicsLinearLayout);
+    d->engine.setRowSpacing(index, spacing, d->orientation);
+    invalidate();
+}
+/*!
+    Returns the spacing after item at \a index.
+*/
+qreal QGraphicsLinearLayout::itemSpacing(int index) const
+{
+    Q_D(const QGraphicsLinearLayout);
+    return d->engine.rowSpacing(index, d->orientation);
+}
+
+/*!
+    Sets the stretch factor for \a item to \a stretch. If an item's stretch
+    factor changes, this function will invalidate the layout.
+
+    Setting \a stretch to 0 removes the stretch factor from the item, and is
+    effectively equivalent to setting \a stretch to 1.
+
+    \sa stretchFactor()
+*/
+void QGraphicsLinearLayout::setStretchFactor(QGraphicsLayoutItem *item, int stretch)
+{
+    Q_D(QGraphicsLinearLayout);
+    if (!item) {
+        qWarning("QGraphicsLinearLayout::setStretchFactor: cannot assign"
+                 " a stretch factor to a null item");
+        return;
+    }
+    if (stretchFactor(item) == stretch)
+        return;
+    d->engine.setStretchFactor(item, stretch, d->orientation);
+    invalidate();
+}
+
+/*!
+    Returns the stretch factor for \a item. The default stretch factor is 0,
+    meaning that the item has no assigned stretch factor.
+
+    \sa setStretchFactor()
+*/
+int QGraphicsLinearLayout::stretchFactor(QGraphicsLayoutItem *item) const
+{
+    Q_D(const QGraphicsLinearLayout);
+    if (!item) {
+        qWarning("QGraphicsLinearLayout::setStretchFactor: cannot return"
+                 " a stretch factor for a null item");
+        return 0;
+    }
+    return d->engine.stretchFactor(item, d->orientation);
+}
+
+/*!
+    Sets the alignment of \a item to \a alignment. If \a item's alignment
+    changes, the layout is automatically invalidated.
+
+    \sa alignment(), invalidate()
+*/
+void QGraphicsLinearLayout::setAlignment(QGraphicsLayoutItem *item, Qt::Alignment alignment)
+{
+    Q_D(QGraphicsLinearLayout);
+    if (this->alignment(item) == alignment)
+        return;
+    d->engine.setAlignment(item, alignment);
+    invalidate();
+}
+
+/*!
+    Returns the alignment for \a item. The default alignment is
+    Qt::AlignCenter.
+
+    The alignment decides how the item is positioned within its assigned space
+    in the case where there's more space available in the layout than the
+    widgets can occupy.
+
+    \sa setAlignment()
+*/
+Qt::Alignment QGraphicsLinearLayout::alignment(QGraphicsLayoutItem *item) const
+{
+    Q_D(const QGraphicsLinearLayout);
+    return d->engine.alignment(item);
+}
+
+#if 0 // ###
+QSizePolicy::ControlTypes QGraphicsLinearLayout::controlTypes(LayoutSide side) const
+{
+    return d->engine.controlTypes(side);
+}
+#endif
+
+/*!
+    \reimp
+*/
+int QGraphicsLinearLayout::count() const
+{
+    Q_D(const QGraphicsLinearLayout);
+    return d->engine.rowCount(d->orientation);
+}
+
+/*!
+    \reimp
+*/
+QGraphicsLayoutItem *QGraphicsLinearLayout::itemAt(int index) const
+{
+    Q_D(const QGraphicsLinearLayout);
+    QGraphicsLayoutItem *item = 0;
+    if (QGridLayoutItem *gridItem = d->engine.itemAt(d->gridRow(index), d->gridColumn(index)))
+        item = gridItem->layoutItem();
+    return item;
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsLinearLayout::setGeometry(const QRectF &rect)
+{
+    Q_D(QGraphicsLinearLayout);
+    QGraphicsLayout::setGeometry(rect);
+    QRectF effectiveRect = geometry();
+    qreal left, top, right, bottom;
+    getContentsMargins(&left, &top, &right, &bottom);
+    Qt::LayoutDirection visualDir = d->visualDirection();
+    d->engine.setVisualDirection(visualDir);
+    if (visualDir == Qt::RightToLeft)
+        qSwap(left, right);
+    effectiveRect.adjust(+left, +top, -right, -bottom);
+#ifdef QT_DEBUG
+    if (qt_graphicsLayoutDebug()) {
+        static int counter = 0;
+        qDebug() << counter++ << "QGraphicsLinearLayout::setGeometry - " << rect;
+        dump(1);
+    }
+#endif
+    d->engine.setGeometries(d->styleInfo(), effectiveRect);
+#ifdef QT_DEBUG
+    if (qt_graphicsLayoutDebug()) {
+        qDebug() << "post dump";
+        dump(1);
+    }
+#endif
+}
+
+/*!
+    \reimp
+*/
+QSizeF QGraphicsLinearLayout::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
+{
+    Q_D(const QGraphicsLinearLayout);
+    qreal left, top, right, bottom;
+    getContentsMargins(&left, &top, &right, &bottom);
+    return d->engine.sizeHint(d->styleInfo(), which , constraint) + QSizeF(left + right, top + bottom);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsLinearLayout::invalidate()
+{
+    Q_D(QGraphicsLinearLayout);
+    d->engine.invalidate();
+    QGraphicsLayout::invalidate();
+}
+
+#ifdef QT_DEBUG
+void QGraphicsLinearLayout::dump(int indent) const
+{
+    if (qt_graphicsLayoutDebug()) {
+        Q_D(const QGraphicsLinearLayout);
+        qDebug("%*s%s layout", indent, "",
+               d->orientation == Qt::Horizontal ? "Horizontal" : "Vertical");
+        d->engine.dump(indent + 1);
+    }
+}
+#endif
+
+QT_END_NAMESPACE
+        
+#endif //QT_NO_GRAPHICSVIEW
diff --git a/src/gui/graphicsview/qgraphicslinearlayout.h b/src/gui/graphicsview/qgraphicslinearlayout.h
new file mode 100644
index 0000000..05ad325
--- /dev/null
+++ b/src/gui/graphicsview/qgraphicslinearlayout.h
@@ -0,0 +1,121 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QGRAPHICSLINEARLAYOUT_H
+#define QGRAPHICSLINEARLAYOUT_H
+
+#include <QtGui/qgraphicsitem.h>
+#include <QtGui/qgraphicslayout.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Gui)
+
+#if !defined(QT_NO_GRAPHICSVIEW) || (QT_EDITION & QT_MODULE_GRAPHICSVIEW) != QT_MODULE_GRAPHICSVIEW
+
+class QGraphicsLinearLayoutPrivate;
+
+class Q_GUI_EXPORT QGraphicsLinearLayout : public QGraphicsLayout
+{
+public:
+    QGraphicsLinearLayout(QGraphicsLayoutItem *parent = 0);
+    QGraphicsLinearLayout(Qt::Orientation orientation, QGraphicsLayoutItem *parent = 0);
+    virtual ~QGraphicsLinearLayout();
+
+    void setOrientation(Qt::Orientation orientation);
+    Qt::Orientation orientation() const;
+
+    inline void addItem(QGraphicsLayoutItem *item) { insertItem(-1, item); }
+    inline void addStretch(int stretch = 1) { insertStretch(-1, stretch); }
+
+    void insertItem(int index, QGraphicsLayoutItem *item);
+    void insertStretch(int index, int stretch = 1);
+
+    void removeItem(QGraphicsLayoutItem *item);
+    void removeAt(int index);
+
+    void setSpacing(qreal spacing);
+    qreal spacing() const;
+    void setItemSpacing(int index, qreal spacing);
+    qreal itemSpacing(int index) const;
+
+    void setStretchFactor(QGraphicsLayoutItem *item, int stretch);
+    int stretchFactor(QGraphicsLayoutItem *item) const;
+
+    void setAlignment(QGraphicsLayoutItem *item, Qt::Alignment alignment);
+    Qt::Alignment alignment(QGraphicsLayoutItem *item) const;
+
+    void setGeometry(const QRectF &rect);
+
+    int count() const;
+    QGraphicsLayoutItem *itemAt(int index) const;
+
+    void invalidate();
+    QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint = QSizeF()) const;
+
+#if 0 // ###
+    Q5SizePolicy::ControlTypes controlTypes(LayoutSide side) const;
+#endif
+
+#ifdef QT_DEBUG
+    void dump(int indent = 0) const;
+#endif
+
+protected:
+#if 0
+    QSize contentsSizeHint(Qt::SizeHint which, const QSize &constraint = QSize()) const;
+#endif
+
+private:
+    Q_DISABLE_COPY(QGraphicsLinearLayout)
+    Q_DECLARE_PRIVATE(QGraphicsLinearLayout)
+};
+
+#endif
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif
+
diff --git a/src/gui/graphicsview/qgraphicsproxywidget.cpp b/src/gui/graphicsview/qgraphicsproxywidget.cpp
new file mode 100644
index 0000000..1bd2e21
--- /dev/null
+++ b/src/gui/graphicsview/qgraphicsproxywidget.cpp
@@ -0,0 +1,1496 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qglobal.h"
+
+#ifndef QT_NO_GRAPHICSVIEW
+
+#include "qgraphicslayout.h"
+#include "qgraphicsproxywidget.h"
+#include "private/qgraphicsproxywidget_p.h"
+#include "private/qwidget_p.h"
+#include "private/qapplication_p.h"
+
+#include <QtCore/qdebug.h>
+#include <QtGui/qevent.h>
+#include <QtGui/qgraphicsscene.h>
+#include <QtGui/qgraphicssceneevent.h>
+#include <QtGui/qlayout.h>
+#include <QtGui/qpainter.h>
+#include <QtGui/qstyleoption.h>
+#include <QtGui/qgraphicsview.h>
+
+QT_BEGIN_NAMESPACE
+
+//#define GRAPHICSPROXYWIDGET_DEBUG
+
+/*!
+    \class QGraphicsProxyWidget
+    \brief The QGraphicsProxyWidget class provides a proxy layer for embedding
+    a QWidget in a QGraphicsScene.
+    \since 4.4
+    \ingroup multimedia
+    \ingroup graphicsview-api
+
+    QGraphicsProxyWidget embeds QWidget-based widgets, for example, a
+    QPushButton, QFontComboBox, or even QFileDialog, into
+    QGraphicsScene. It forwards events between the two objects and
+    translates between QWidget's integer-based geometry and
+    QGraphicsWidget's qreal-based geometry. QGraphicsProxyWidget
+    supports all core features of QWidget, including tab focus,
+    keyboard input, Drag & Drop, and popups.  You can also embed
+    complex widgets, e.g., widgets with subwidgets.
+
+    Example:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsproxywidget.cpp 0
+
+    QGraphicsProxyWidget takes care of automatically embedding popup children
+    of embedded widgets through creating a child proxy for each popup. This
+    means that when an embedded QComboBox shows its popup list, a new
+    QGraphicsProxyWidget is created automatically, embedding the popup, and
+    positioning it correctly.
+
+    \section1 Embedding a Widget with QGraphicsProxyWidget
+
+    There are two ways to embed a widget using QGraphicsProxyWidget. The most
+    common way is to pass a widget pointer to QGraphicsScene::addWidget()
+    together with any relevant \l Qt::WindowFlags. This function returns a
+    pointer to a QGraphicsProxyWidget. You can then choose to reparent or
+    position either the proxy, or the embedded widget itself.
+
+    For example, in the code snippet below, we embed a group box into the proxy:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsproxywidget.cpp 1
+
+    The image below is the output obtained with its contents margin and
+    contents rect labeled.
+
+    \image qgraphicsproxywidget-embed.png
+
+    Alternatively, you can start by creating a new QGraphicsProxyWidget item,
+    and then call setWidget() to embed a QWidget later. The widget() function
+    returns a pointer to the embedded widget. QGraphicsProxyWidget shares
+    ownership with QWidget, so if either of the two widgets are destroyed, the
+    other widget will be automatically destroyed as well.
+
+    \section1 Synchronizing Widget States
+
+    QGraphicsProxyWidget keeps its state in sync with the embedded widget. For
+    example, if the proxy is hidden or disabled, the embedded widget will be
+    hidden or disabled as well, and vice versa. When the widget is embedded by
+    calling addWidget(), QGraphicsProxyWidget copies the state from the widget
+    into the proxy, and after that, the two will stay synchronized where
+    possible. By default, when you embed a widget into a proxy, both the widget
+    and the proxy will be visible because a QGraphicsWidget is visible when
+    created (you do not have to call show()). If you explicitly hide the
+    embedded widget, the proxy will also become invisible.
+
+    Example:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsproxywidget.cpp 2
+
+    QGraphicsProxyWidget maintains symmetry for the following states:
+
+    \table
+    \header \o QWidget state       \o QGraphicsProxyWidget state      \o Notes
+    \row     \o QWidget::enabled
+                    \o QGraphicsProxyWidget::enabled
+                        \o
+    \row    \o QWidget::visible
+                    \o QGraphicsProxyWidget::visible
+                        \o The explicit state is also symmetric.
+    \row    \o QWidget::geometry
+                    \o QGraphicsProxyWidget::geometry
+                        \o Geometry is only guaranteed to be symmetric while
+                            the embedded widget is visible.
+    \row    \o QWidget::layoutDirection
+                    \o QGraphicsProxyWidget::layoutDirection
+                        \o
+    \row    \o QWidget::style
+                    \o QGraphicsProxyWidget::style
+                        \o
+    \row    \o QWidget::palette
+                    \o QGraphicsProxyWidget::palette
+                        \o
+    \row    \o QWidget::font
+                    \o QGraphicsProxyWidget::font
+                        \o
+    \row    \o QWidget::cursor
+                    \o QGraphicsProxyWidget::cursor
+                        \o The embedded widget overrides the proxy widget
+                            cursor. The proxy cursor changes depending on
+                            which embedded subwidget is currently under the
+                            mouse.
+    \row    \o QWidget::sizeHint()
+                    \o QGraphicsProxyWidget::sizeHint()
+                        \o All size hint functionality from the embedded
+                            widget is forwarded by the proxy.
+    \row    \o QWidget::getContentsMargins()
+                    \o QGraphicsProxyWidget::getContentsMargins()
+                        \o Updated once by setWidget().
+    \row    \o QWidget::windowTitle
+                    \o QGraphicsProxyWidget::windowTitle
+                        \o Updated once by setWidget().
+    \endtable
+
+    \note QGraphicsScene keeps the embedded widget in a special state that
+    prevents it from disturbing other widgets (both embedded and not embedded)
+    while the widget is embedded. In this state, the widget may differ slightly
+    in behavior from when it is not embedded.
+
+    \sa QGraphicsScene::addWidget(), QGraphicsWidget
+*/
+
+extern bool qt_sendSpontaneousEvent(QObject *, QEvent *);
+
+/*!
+    \internal
+*/
+void QGraphicsProxyWidgetPrivate::init()
+{
+    Q_Q(QGraphicsProxyWidget);
+    q->setFocusPolicy(Qt::WheelFocus);
+    q->setAcceptDrops(true);
+}
+
+/*!
+    \internal
+*/
+void QGraphicsProxyWidgetPrivate::sendWidgetMouseEvent(QGraphicsSceneHoverEvent *event)
+{
+    QGraphicsSceneMouseEvent mouseEvent(QEvent::GraphicsSceneMouseMove);
+    mouseEvent.setPos(event->pos());
+    mouseEvent.setScreenPos(event->screenPos());
+    mouseEvent.setButton(Qt::NoButton);
+    mouseEvent.setButtons(0);
+    mouseEvent.setModifiers(event->modifiers());
+    sendWidgetMouseEvent(&mouseEvent);
+    event->setAccepted(mouseEvent.isAccepted());
+}
+
+/*!
+    \internal
+*/
+void QGraphicsProxyWidgetPrivate::sendWidgetMouseEvent(QGraphicsSceneMouseEvent *event)
+{
+    if (!event || !widget || !widget->isVisible())
+        return;
+    Q_Q(QGraphicsProxyWidget);
+
+    // Find widget position and receiver.
+    QPointF pos = event->pos();
+    QPointer<QWidget> alienWidget = widget->childAt(pos.toPoint());
+    QPointer<QWidget> receiver =  alienWidget ? alienWidget : widget;
+
+    if (QWidgetPrivate::nearestGraphicsProxyWidget(receiver) != q)
+        return; //another proxywidget will handle the events
+
+    // Translate QGraphicsSceneMouse events to QMouseEvents.
+    QEvent::Type type = QEvent::None;
+    switch (event->type()) {
+    case QEvent::GraphicsSceneMousePress:
+        type = QEvent::MouseButtonPress;
+        if (!embeddedMouseGrabber)
+            embeddedMouseGrabber = receiver;
+        else
+            receiver = embeddedMouseGrabber;
+        break;
+    case QEvent::GraphicsSceneMouseRelease:
+        type = QEvent::MouseButtonRelease;
+        if (embeddedMouseGrabber)
+            receiver = embeddedMouseGrabber;
+        break;
+    case QEvent::GraphicsSceneMouseDoubleClick:
+        type = QEvent::MouseButtonDblClick;
+        if (!embeddedMouseGrabber)
+            embeddedMouseGrabber = receiver;
+        else
+            receiver = embeddedMouseGrabber;
+        break;
+    case QEvent::GraphicsSceneMouseMove:
+        type = QEvent::MouseMove;
+        if (embeddedMouseGrabber)
+            receiver = embeddedMouseGrabber;
+        break;
+    default:
+        Q_ASSERT_X(false, "QGraphicsProxyWidget", "internal error");
+        break;
+    }
+
+    if (!lastWidgetUnderMouse) {
+        QApplicationPrivate::dispatchEnterLeave(embeddedMouseGrabber ? embeddedMouseGrabber : widget, 0);
+        lastWidgetUnderMouse = widget;
+    }
+
+    // Map event position from us to the receiver
+    pos = mapToReceiver(pos, receiver);
+
+    // Send mouse event.
+    QMouseEvent *mouseEvent = QMouseEvent::createExtendedMouseEvent(type, pos,
+                                                                    receiver->mapToGlobal(pos.toPoint()), event->button(),
+                                                                    event->buttons(), event->modifiers());
+
+    QWidget *embeddedMouseGrabberPtr = (QWidget *)embeddedMouseGrabber;
+    QApplicationPrivate::sendMouseEvent(receiver, mouseEvent, alienWidget, widget,
+                                        &embeddedMouseGrabberPtr, lastWidgetUnderMouse);
+    embeddedMouseGrabber = embeddedMouseGrabberPtr;
+
+    // Handle enter/leave events when last button is released from mouse
+    // grabber child widget.
+    if (embeddedMouseGrabber && type == QEvent::MouseButtonRelease && !event->buttons()) {
+        Q_Q(QGraphicsProxyWidget);
+        if (q->rect().contains(event->pos()) && q->acceptsHoverEvents())
+            lastWidgetUnderMouse = alienWidget ? alienWidget : widget;
+        else // released on the frame our outside the item, or doesn't accept hover events.
+            lastWidgetUnderMouse = 0;
+
+        QApplicationPrivate::dispatchEnterLeave(lastWidgetUnderMouse, embeddedMouseGrabber);
+        embeddedMouseGrabber = 0;
+
+#ifndef QT_NO_CURSOR
+        // ### Restore the cursor, don't override it.
+        if (!lastWidgetUnderMouse)
+            q->unsetCursor();
+#endif
+    }
+
+    event->setAccepted(mouseEvent->isAccepted());
+    delete mouseEvent;
+}
+
+void QGraphicsProxyWidgetPrivate::sendWidgetKeyEvent(QKeyEvent *event)
+{
+    Q_Q(QGraphicsProxyWidget);
+    if (!event || !widget || !widget->isVisible())
+        return;
+
+    QPointer<QWidget> receiver = widget->focusWidget();
+    if (!receiver)
+        receiver = widget;
+    Q_ASSERT(receiver);
+
+    do {
+        bool res = QApplication::sendEvent(receiver, event);
+        if ((res && event->isAccepted()) || (q->isWindow() && receiver == widget))
+            break;
+        receiver = receiver->parentWidget();
+    } while (receiver);
+}
+
+/*!
+    \internal
+*/
+void QGraphicsProxyWidgetPrivate::removeSubFocusHelper(QWidget *widget, Qt::FocusReason reason)
+{
+    QFocusEvent event(QEvent::FocusOut, reason);
+    QPointer<QWidget> widgetGuard = widget;
+    QApplication::sendEvent(widget, &event);
+    if (widgetGuard && event.isAccepted())
+        QApplication::sendEvent(widget->style(), &event);
+}
+
+/*!
+    \internal
+
+    Reimplemented from QGraphicsItemPrivate. ### Qt 5: Move impl to
+    reimplementation QGraphicsProxyWidget::inputMethodQuery().
+*/
+QVariant QGraphicsProxyWidgetPrivate::inputMethodQueryHelper(Qt::InputMethodQuery query) const
+{
+    Q_Q(const QGraphicsProxyWidget);
+    if (!widget || !q->hasFocus())
+        return QVariant();
+
+    QWidget *focusWidget = widget->focusWidget();
+    if (!focusWidget)
+        focusWidget = widget;
+    QVariant v = focusWidget->inputMethodQuery(query);
+    QPointF focusWidgetPos = q->subWidgetRect(focusWidget).topLeft();
+    switch (v.type()) {
+    case QVariant::RectF:
+        v = v.toRectF().translated(focusWidgetPos);
+        break;
+    case QVariant::PointF:
+        v = v.toPointF() + focusWidgetPos;
+        break;
+    case QVariant::Rect:
+        v = v.toRect().translated(focusWidgetPos.toPoint());
+        break;
+    case QVariant::Point:
+        v = v.toPoint() + focusWidgetPos.toPoint();
+        break;
+    default:
+        break;
+    }
+    return v;
+}
+
+/*!
+    \internal
+*/
+QWidget *QGraphicsProxyWidgetPrivate::findFocusChild(QWidget *child, bool next) const
+{
+    if (!widget)
+        return 0;
+
+    // Run around the focus chain until we find a widget that can take tab focus.
+    if (!child) {
+	child = next ? (QWidget *)widget : widget->d_func()->focus_prev;
+    } else {
+        child = next ? child->d_func()->focus_next : child->d_func()->focus_prev;
+        if ((next && child == widget) || (!next && child == widget->d_func()->focus_prev)) {
+             return 0;
+	}
+    }
+
+    QWidget *oldChild = child;
+    do {
+        if (child->isEnabled()
+	    && child->isVisibleTo(widget)
+            && (child->focusPolicy() & Qt::TabFocus)) {
+	    return child;
+        }
+        child = next ? child->d_func()->focus_next : child->d_func()->focus_prev;
+    } while (child != oldChild && !(next && child == widget) && !(!next && child == widget->d_func()->focus_prev));
+    return 0;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsProxyWidgetPrivate::_q_removeWidgetSlot()
+{
+    Q_Q(QGraphicsProxyWidget);
+    widget = 0;
+    delete q;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsProxyWidgetPrivate::updateWidgetGeometryFromProxy()
+{
+}
+
+/*!
+    \internal
+*/
+void QGraphicsProxyWidgetPrivate::updateProxyGeometryFromWidget()
+{
+    Q_Q(QGraphicsProxyWidget);
+    if (!widget)
+        return;
+
+    QRectF widgetGeometry = widget->geometry();
+    QWidget *parentWidget = widget->parentWidget();
+    if (widget->isWindow()) {
+        QGraphicsProxyWidget *proxyParent = 0;
+        if (parentWidget && (proxyParent = qobject_cast<QGraphicsProxyWidget *>(q->parentWidget()))) {
+            // Nested window proxy (e.g., combobox popup), map widget to the
+            // parent widget's global coordinates, and map that to the parent
+            // proxy's child coordinates.
+            widgetGeometry.moveTo(proxyParent->subWidgetRect(parentWidget).topLeft()
+                                  + parentWidget->mapFromGlobal(widget->pos()));
+        }
+    }
+
+    // Adjust to size hint if the widget has never been resized.
+    if (!widget->size().isValid())
+        widgetGeometry.setSize(widget->sizeHint());
+
+    // Assign new geometry.
+    posChangeMode = QGraphicsProxyWidgetPrivate::WidgetToProxyMode;
+    sizeChangeMode = QGraphicsProxyWidgetPrivate::WidgetToProxyMode;
+    q->setGeometry(widgetGeometry);
+    posChangeMode = QGraphicsProxyWidgetPrivate::NoMode;
+    sizeChangeMode = QGraphicsProxyWidgetPrivate::NoMode;
+}
+
+/*!
+    \internal
+
+    Embeds \a subWin as a subwindow of this proxy widget. \a subWin must be a top-level
+    widget and a descendant of the widget managed by this proxy. A separate subproxy
+    will be created as a child of this proxy widget to manage \a subWin.
+*/
+void QGraphicsProxyWidgetPrivate::embedSubWindow(QWidget *subWin)
+{
+    QWExtra *extra;
+    if (!((extra = subWin->d_func()->extra) && extra->proxyWidget)) {
+        QGraphicsProxyWidget *subProxy = new QGraphicsProxyWidget(q_func());
+        subProxy->d_func()->setWidget_helper(subWin, false);
+    }
+}
+
+/*!
+    \internal
+
+    Removes ("unembeds") \a subWin and deletes the proxy holder item. This can
+    happen when QWidget::setParent() reparents the embedded window out of
+    "embedded space".
+*/
+void QGraphicsProxyWidgetPrivate::unembedSubWindow(QWidget *subWin)
+{
+    foreach (QGraphicsItem *child, children) {
+        if (child->isWidget()) {
+            if (QGraphicsProxyWidget *proxy = qobject_cast<QGraphicsProxyWidget *>(static_cast<QGraphicsWidget *>(child))) {
+                if (proxy->widget() == subWin) {
+                    proxy->setWidget(0);
+                    scene->removeItem(proxy);
+                    delete proxy;
+                    return;
+                }
+            }
+        }
+    }
+}
+
+bool QGraphicsProxyWidgetPrivate::isProxyWidget() const
+{
+    return true;
+}
+
+/*!
+     \internal
+*/
+QPointF QGraphicsProxyWidgetPrivate::mapToReceiver(const QPointF &pos, const QWidget *receiver) const
+{
+    QPointF p = pos;
+    // Map event position from us to the receiver, preserving its
+    // precision (don't use QWidget::mapFrom here).
+    while (receiver && receiver != widget) {
+        p -= QPointF(receiver->pos());
+        receiver = receiver->parentWidget();
+    }
+    return p;
+}
+
+/*!
+    Constructs a new QGraphicsProxy widget. \a parent and \a wFlags are passed
+    to QGraphicsItem's constructor.
+*/
+QGraphicsProxyWidget::QGraphicsProxyWidget(QGraphicsItem *parent, Qt::WindowFlags wFlags)
+    : QGraphicsWidget(*new QGraphicsProxyWidgetPrivate, parent, 0, wFlags)
+{
+    Q_D(QGraphicsProxyWidget);
+    d->init();
+}
+
+/*!
+    Destroys the proxy widget and any embedded widget.
+*/
+QGraphicsProxyWidget::~QGraphicsProxyWidget()
+{
+    Q_D(QGraphicsProxyWidget);
+    if (d->widget) {
+        QObject::disconnect(d->widget, SIGNAL(destroyed()), this, SLOT(_q_removeWidgetSlot()));
+        delete d->widget;
+    }
+}
+
+/*!
+    Embeds \a widget into this proxy widget. The embedded widget must reside
+    exclusively either inside or outside of Graphics View. You cannot embed a
+    widget as long as it is is visible elsewhere in the UI, at the same time.
+
+    \a widget must be a top-level widget whose parent is 0.
+
+    When the widget is embedded, its state (e.g., visible, enabled, geometry,
+    size hints) is copied into the proxy widget. If the embedded widget is
+    explicitly hidden or disabled, the proxy widget will become explicitly
+    hidden or disabled after embedding is complete. The class documentation
+    has a full overview over the shared state.
+
+    After this function returns, QGraphicsProxyWidget will keep its state
+    synchronized with that of \a widget whenever possible.
+
+    If a widget is already embedded by this proxy when this function is
+    called, that widget will first be automatically unembedded. Passing 0 for
+    the \a widget argument will only unembed the widget, and the ownership of
+    the currently embedded widget will be passed on to the caller.
+    Every child widget that are embedded will also be embedded and their proxy
+    widget destroyed.
+
+    Note that widgets with the Qt::WA_PaintOnScreen widget attribute
+    set and widgets that wrap an external application or controller
+    cannot be embedded. Examples are QGLWidget and QAxWidget.
+
+    \sa widget()
+*/
+void QGraphicsProxyWidget::setWidget(QWidget *widget)
+{
+    Q_D(QGraphicsProxyWidget);
+    d->setWidget_helper(widget, true);
+}
+
+void QGraphicsProxyWidgetPrivate::setWidget_helper(QWidget *newWidget, bool autoShow)
+{
+    Q_Q(QGraphicsProxyWidget);
+    if (newWidget == widget)
+        return;
+    if (widget) {
+        QObject::disconnect(widget, SIGNAL(destroyed()), q, SLOT(_q_removeWidgetSlot()));
+        widget->removeEventFilter(q);
+        widget->setAttribute(Qt::WA_DontShowOnScreen, false);
+        widget->d_func()->extra->proxyWidget = 0;
+        resolveFont(inheritedFontResolveMask);
+        resolvePalette(inheritedPaletteResolveMask);
+        widget->update();
+
+        foreach (QGraphicsItem *child, q->childItems()) {
+            if (child->d_ptr->isProxyWidget()) {
+                QGraphicsProxyWidget *childProxy = static_cast<QGraphicsProxyWidget *>(child);
+                QWidget * parent = childProxy->widget();
+                while (parent->parentWidget() != 0) {
+                    if (parent == widget)
+                        break;
+                    parent = parent->parentWidget();
+                }
+                if (!childProxy->widget() || parent != widget)
+                    continue;
+                childProxy->setWidget(0);
+                delete childProxy;
+            }
+        }
+
+        widget = 0;
+#ifndef QT_NO_CURSOR
+        q->unsetCursor();
+#endif
+        q->setAcceptHoverEvents(false);
+        if (!newWidget)
+            q->update();
+    }
+    if (!newWidget)
+        return;
+    if (!newWidget->isWindow()) {
+        QWExtra *extra = newWidget->parentWidget()->d_func()->extra;
+        if (!extra || !extra->proxyWidget)  {
+            qWarning("QGraphicsProxyWidget::setWidget: cannot embed widget %p "
+                     "which is not a toplevel widget, and is not a child of an embedded widget", newWidget);
+            return;
+        }
+    }
+
+    // Register this proxy within the widget's private.
+    // ### This is a bit backdoorish
+    QWExtra *extra = newWidget->d_func()->extra;
+    if (!extra) {
+        newWidget->d_func()->createExtra();
+        extra = newWidget->d_func()->extra;
+    }
+    QGraphicsProxyWidget **proxyWidget = &extra->proxyWidget;
+    if (*proxyWidget) {
+        if (*proxyWidget != q) {
+            qWarning("QGraphicsProxyWidget::setWidget: cannot embed widget %p"
+                        "; already embedded", newWidget);
+        }
+        return;
+    }
+    *proxyWidget = q;
+
+    newWidget->setAttribute(Qt::WA_DontShowOnScreen);
+    newWidget->ensurePolished();
+    // Do not wait for this widget to close before the app closes ###
+    // shouldn't this widget inherit the attribute?
+    newWidget->setAttribute(Qt::WA_QuitOnClose, false);
+    q->setAcceptHoverEvents(true);
+
+    if (newWidget->testAttribute(Qt::WA_NoSystemBackground))
+        q->setAttribute(Qt::WA_NoSystemBackground);
+    if (newWidget->testAttribute(Qt::WA_OpaquePaintEvent))
+        q->setAttribute(Qt::WA_OpaquePaintEvent);
+
+    widget = newWidget;
+
+    // Changes only go from the widget to the proxy.
+    enabledChangeMode = QGraphicsProxyWidgetPrivate::WidgetToProxyMode;
+    visibleChangeMode = QGraphicsProxyWidgetPrivate::WidgetToProxyMode;
+    posChangeMode = QGraphicsProxyWidgetPrivate::WidgetToProxyMode;
+    sizeChangeMode = QGraphicsProxyWidgetPrivate::WidgetToProxyMode;
+
+    if ((autoShow && !newWidget->testAttribute(Qt::WA_WState_ExplicitShowHide)) || !newWidget->testAttribute(Qt::WA_WState_Hidden)) {
+        newWidget->show();
+    }
+
+    // Copy the state from the widget onto the proxy.
+#ifndef QT_NO_CURSOR
+    if (newWidget->testAttribute(Qt::WA_SetCursor))
+        q->setCursor(widget->cursor());
+#endif
+    Qt::WFlags flags = newWidget->windowFlags();
+    if (newWidget->windowType() == Qt::Window)
+        flags &= ~Qt::Window;
+    q->setWindowFlags(flags);
+    q->setEnabled(newWidget->isEnabled());
+    q->setVisible(newWidget->isVisible());
+    q->setLayoutDirection(newWidget->layoutDirection());
+    if (newWidget->testAttribute(Qt::WA_SetStyle))
+        q->setStyle(widget->style());
+
+    resolveFont(inheritedFontResolveMask);
+    resolvePalette(inheritedPaletteResolveMask);
+
+    if (!newWidget->testAttribute(Qt::WA_Resized))
+        newWidget->adjustSize();
+
+    int left, top, right, bottom;
+    newWidget->getContentsMargins(&left, &top, &right, &bottom);
+    q->setContentsMargins(left, top, right, bottom);
+    q->setWindowTitle(newWidget->windowTitle());
+
+    // size policies and constraints..
+    q->setSizePolicy(newWidget->sizePolicy());
+    QSize sz = newWidget->minimumSize();
+    q->setMinimumSize(sz.isNull() ? QSizeF() : QSizeF(sz));
+    sz = newWidget->maximumSize();
+    q->setMaximumSize(sz.isNull() ? QSizeF() : QSizeF(sz));
+
+    updateProxyGeometryFromWidget();
+
+    // Hook up the event filter to keep the state up to date.
+    newWidget->installEventFilter(q);
+    QObject::connect(newWidget, SIGNAL(destroyed()), q, SLOT(_q_removeWidgetSlot()));
+
+    // Changes no longer go only from the widget to the proxy.
+    enabledChangeMode = QGraphicsProxyWidgetPrivate::NoMode;
+    visibleChangeMode = QGraphicsProxyWidgetPrivate::NoMode;
+    posChangeMode = QGraphicsProxyWidgetPrivate::NoMode;
+    sizeChangeMode = QGraphicsProxyWidgetPrivate::NoMode;
+}
+
+/*!
+    Returns a pointer to the embedded widget.
+
+    \sa setWidget()
+*/
+QWidget *QGraphicsProxyWidget::widget() const
+{
+    Q_D(const QGraphicsProxyWidget);
+    return d->widget;
+}
+
+/*!
+    Returns the rectangle for \a widget, which must be a descendant of
+    widget(), or widget() itself, in this proxy item's local coordinates.
+
+    If no widget is embedded, \a widget is 0, or \a widget is not a
+    descendant of the embedded widget, this function returns an empty QRectF.
+
+    \sa widget()
+*/
+QRectF QGraphicsProxyWidget::subWidgetRect(const QWidget *widget) const
+{
+    Q_D(const QGraphicsProxyWidget);
+    if (!widget || !d->widget)
+        return QRectF();
+    if (d->widget == widget || d->widget->isAncestorOf(widget))
+        return QRectF(widget->mapTo(d->widget, QPoint(0, 0)), widget->size());
+    return QRectF();
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsProxyWidget::setGeometry(const QRectF &rect)
+{
+    Q_D(QGraphicsProxyWidget);
+    bool proxyResizesWidget = !d->posChangeMode && !d->sizeChangeMode;
+    if (proxyResizesWidget) {
+        d->posChangeMode = QGraphicsProxyWidgetPrivate::ProxyToWidgetMode;
+        d->sizeChangeMode = QGraphicsProxyWidgetPrivate::ProxyToWidgetMode;
+    }
+    QGraphicsWidget::setGeometry(rect);
+    if (proxyResizesWidget) {
+        d->posChangeMode = QGraphicsProxyWidgetPrivate::NoMode;
+        d->sizeChangeMode = QGraphicsProxyWidgetPrivate::NoMode;
+    }
+}
+
+/*!
+    \reimp
+*/
+QVariant QGraphicsProxyWidget::itemChange(GraphicsItemChange change,
+                                          const QVariant &value)
+{
+    Q_D(QGraphicsProxyWidget);
+
+    switch (change) {
+    case ItemPositionChange:
+        // The item's position is either changed directly on the proxy, in
+        // which case the position change should propagate to the widget,
+        // otherwise it happens as a side effect when filtering QEvent::Move.
+        if (!d->posChangeMode)
+            d->posChangeMode = QGraphicsProxyWidgetPrivate::ProxyToWidgetMode;
+        break;
+    case ItemPositionHasChanged:
+        // Move the internal widget if we're in widget-to-proxy
+        // mode. Otherwise the widget has already moved.
+        if (d->widget && d->posChangeMode != QGraphicsProxyWidgetPrivate::WidgetToProxyMode)
+            d->widget->move(value.toPoint());
+        if (d->posChangeMode == QGraphicsProxyWidgetPrivate::ProxyToWidgetMode)
+            d->posChangeMode = QGraphicsProxyWidgetPrivate::NoMode;
+        break;
+    case ItemVisibleChange:
+        if (!d->visibleChangeMode)
+            d->visibleChangeMode = QGraphicsProxyWidgetPrivate::ProxyToWidgetMode;
+        break;
+    case ItemVisibleHasChanged:
+        if (d->widget && d->visibleChangeMode != QGraphicsProxyWidgetPrivate::WidgetToProxyMode)
+            d->widget->setVisible(isVisible());
+        if (d->visibleChangeMode == QGraphicsProxyWidgetPrivate::ProxyToWidgetMode)
+            d->visibleChangeMode = QGraphicsProxyWidgetPrivate::NoMode;
+        break;
+    case ItemEnabledChange:
+        if (!d->enabledChangeMode)
+            d->enabledChangeMode = QGraphicsProxyWidgetPrivate::ProxyToWidgetMode;
+        break;
+    case ItemEnabledHasChanged:
+        if (d->widget && d->enabledChangeMode != QGraphicsProxyWidgetPrivate::WidgetToProxyMode)
+            d->widget->setEnabled(isEnabled());
+        if (d->enabledChangeMode == QGraphicsProxyWidgetPrivate::ProxyToWidgetMode)
+            d->enabledChangeMode = QGraphicsProxyWidgetPrivate::NoMode;
+        break;
+    default:
+        break;
+    }
+    return QGraphicsWidget::itemChange(change, value);
+}
+
+/*!
+    \reimp
+*/
+bool QGraphicsProxyWidget::event(QEvent *event)
+{
+    Q_D(QGraphicsProxyWidget);
+    if (!d->widget)
+        return QGraphicsWidget::event(event);
+
+    switch (event->type()) {
+    case QEvent::StyleChange:
+        // Propagate style changes to the embedded widget.
+        if (!d->styleChangeMode) {
+            d->styleChangeMode = QGraphicsProxyWidgetPrivate::ProxyToWidgetMode;
+            d->widget->setStyle(style());
+            d->styleChangeMode = QGraphicsProxyWidgetPrivate::NoMode;
+        }
+        break;
+    case QEvent::FontChange: {
+        // Propagate to widget.
+        QWidgetPrivate *wd = d->widget->d_func();
+        int mask = d->font.resolve() | d->inheritedFontResolveMask;
+        wd->inheritedFontResolveMask = mask;
+        wd->resolveFont();
+        break;
+    }
+    case QEvent::PaletteChange: {
+        // Propagate to widget.
+        QWidgetPrivate *wd = d->widget->d_func();
+        int mask = d->palette.resolve() | d->inheritedPaletteResolveMask;
+        wd->inheritedPaletteResolveMask = mask;
+        wd->resolvePalette();
+        break;
+    }
+    case QEvent::InputMethod: {
+        // Forward input method events if the focus widget enables
+        // input methods.
+        // ### Qt 4.5: this code must also go into a reimplementation
+        // of inputMethodEvent().
+        QWidget *focusWidget = d->widget->focusWidget();
+        if (focusWidget->testAttribute(Qt::WA_InputMethodEnabled))
+            QApplication::sendEvent(focusWidget, event);
+        break;
+    }
+    case QEvent::ShortcutOverride: {
+        QWidget *focusWidget = d->widget->focusWidget();
+        while (focusWidget) {
+            QApplication::sendEvent(focusWidget, event);
+            if (event->isAccepted())
+                return true;
+            focusWidget = focusWidget->parentWidget();
+        }
+        return false;
+    }
+    case QEvent::KeyPress: {
+        QKeyEvent *k = static_cast<QKeyEvent *>(event);
+        if (k->key() == Qt::Key_Tab || k->key() == Qt::Key_Backtab) {
+            if (!(k->modifiers() & (Qt::ControlModifier | Qt::AltModifier))) {  //### Add MetaModifier?
+                QWidget *focusWidget = d->widget->focusWidget();
+                while (focusWidget) {
+                    bool res = QApplication::sendEvent(focusWidget, event);
+                    if ((res && event->isAccepted()) || (isWindow() && focusWidget == d->widget)) {
+                        event->accept();
+                        break;
+                    }
+                    focusWidget = focusWidget->parentWidget();
+                }
+                return true;
+            }
+        }
+        break;
+    }
+    default:
+        break;
+    }
+    return QGraphicsWidget::event(event);
+}
+
+/*!
+    \reimp
+*/
+bool QGraphicsProxyWidget::eventFilter(QObject *object, QEvent *event)
+{
+    Q_D(QGraphicsProxyWidget);
+
+    if (object == d->widget) {
+        switch (event->type()) {
+        case QEvent::LayoutRequest:
+            updateGeometry();
+            break;
+         case QEvent::Resize:
+             // If the widget resizes itself, we resize the proxy too.
+             // Prevent feed-back by checking the geometry change mode.
+             if (!d->sizeChangeMode)
+                 d->updateProxyGeometryFromWidget();
+            break;
+         case QEvent::Move:
+             // If the widget moves itself, we move the proxy too.  Prevent
+             // feed-back by checking the geometry change mode.
+             if (!d->posChangeMode)
+                 d->updateProxyGeometryFromWidget();
+            break;
+        case QEvent::Hide:
+        case QEvent::Show:
+            // If the widget toggles its visible state, the proxy will follow.
+            if (!d->visibleChangeMode) {
+                d->visibleChangeMode = QGraphicsProxyWidgetPrivate::WidgetToProxyMode;
+                setVisible(event->type() == QEvent::Show);
+                d->visibleChangeMode = QGraphicsProxyWidgetPrivate::NoMode;
+            }
+            break;
+        case QEvent::EnabledChange:
+            // If the widget toggles its enabled state, the proxy will follow.
+            if (!d->enabledChangeMode) {
+                d->enabledChangeMode = QGraphicsProxyWidgetPrivate::WidgetToProxyMode;
+                setEnabled(d->widget->isEnabled());
+                d->enabledChangeMode = QGraphicsProxyWidgetPrivate::NoMode;
+            }
+            break;
+        case QEvent::StyleChange:
+            // Propagate style changes to the proxy.
+            if (!d->styleChangeMode) {
+                d->styleChangeMode = QGraphicsProxyWidgetPrivate::WidgetToProxyMode;
+                setStyle(d->widget->style());
+                d->styleChangeMode = QGraphicsProxyWidgetPrivate::NoMode;
+            }
+            break;
+        default:
+            break;
+        }
+    }
+    return QGraphicsWidget::eventFilter(object, event);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsProxyWidget::showEvent(QShowEvent *event)
+{
+    Q_UNUSED(event);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsProxyWidget::hideEvent(QHideEvent *event)
+{
+    Q_UNUSED(event);
+}
+
+#ifndef QT_NO_CONTEXTMENU
+/*!
+    \reimp
+*/
+void QGraphicsProxyWidget::contextMenuEvent(QGraphicsSceneContextMenuEvent *event)
+{
+    Q_D(QGraphicsProxyWidget);
+    if (!event || !d->widget || !d->widget->isVisible())
+        return;
+
+    // Find widget position and receiver.
+    QPointF pos = event->pos();
+    QPointer<QWidget> alienWidget = d->widget->childAt(pos.toPoint());
+    QPointer<QWidget> receiver =  alienWidget ? alienWidget : d->widget;
+
+    // Map event position from us to the receiver
+    pos = d->mapToReceiver(pos, receiver);
+
+    // Send mouse event. ### Doesn't propagate the event.
+    QContextMenuEvent contextMenuEvent(QContextMenuEvent::Reason(event->reason()),
+                                       pos.toPoint(), receiver->mapToGlobal(pos.toPoint()), event->modifiers());
+    QApplication::sendEvent(receiver, &contextMenuEvent);
+
+    event->setAccepted(contextMenuEvent.isAccepted());
+}
+#endif // QT_NO_CONTEXTMENU
+
+#ifndef QT_NO_DRAGANDDROP
+/*!
+    \reimp
+*/
+void QGraphicsProxyWidget::dragEnterEvent(QGraphicsSceneDragDropEvent *event)
+{
+#ifdef QT_NO_DRAGANDDROP
+    Q_UNUSED(event);
+#else
+    Q_D(QGraphicsProxyWidget);
+    if (!d->widget)
+        return;
+
+    QDragEnterEvent proxyDragEnter(event->pos().toPoint(), event->dropAction(), event->mimeData(), event->buttons(), event->modifiers());
+    proxyDragEnter.setAccepted(event->isAccepted());
+    QApplication::sendEvent(d->widget, &proxyDragEnter);
+    event->setAccepted(proxyDragEnter.isAccepted());
+    if (proxyDragEnter.isAccepted())    // we discard answerRect
+        event->setDropAction(proxyDragEnter.dropAction());
+#endif
+}
+/*!
+    \reimp
+*/
+void QGraphicsProxyWidget::dragLeaveEvent(QGraphicsSceneDragDropEvent *event)
+{
+    Q_UNUSED(event);
+#ifndef QT_NO_DRAGANDDROP
+    Q_D(QGraphicsProxyWidget);
+    if (!d->widget || !d->dragDropWidget)
+        return;
+    QDragLeaveEvent proxyDragLeave;
+    QApplication::sendEvent(d->dragDropWidget, &proxyDragLeave);
+    d->dragDropWidget = 0;
+#endif
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsProxyWidget::dragMoveEvent(QGraphicsSceneDragDropEvent *event)
+{
+#ifdef QT_NO_DRAGANDDROP
+    Q_UNUSED(event);
+#else
+    Q_D(QGraphicsProxyWidget);
+    if (!d->widget)
+        return;
+    QPointF p = event->pos();
+    event->ignore();
+    QPointer<QWidget> subWidget = d->widget->childAt(p.toPoint());
+    QPointer<QWidget> receiver =  subWidget ? subWidget : d->widget;
+    bool eventDelivered = false;
+    for (; receiver; receiver = receiver->parentWidget()) {
+        if (!receiver->isEnabled() || !receiver->acceptDrops())
+            continue;
+        // Map event position from us to the receiver
+        QPoint receiverPos = d->mapToReceiver(p, receiver).toPoint();
+        if (receiver != d->dragDropWidget) {
+            // Try to enter before we leave
+            QDragEnterEvent dragEnter(receiverPos, event->possibleActions(), event->mimeData(), event->buttons(), event->modifiers());
+            dragEnter.setDropAction(event->proposedAction());            
+            QApplication::sendEvent(receiver, &dragEnter);
+            event->setAccepted(dragEnter.isAccepted());
+            event->setDropAction(dragEnter.dropAction());
+            if (!event->isAccepted()) {
+                // propagate to the parent widget
+                continue;
+            }
+
+            d->lastDropAction = event->dropAction();
+
+            if (d->dragDropWidget) {
+                QDragLeaveEvent dragLeave;
+                QApplication::sendEvent(d->dragDropWidget, &dragLeave);
+            }
+            d->dragDropWidget = receiver;
+        }
+
+        QDragMoveEvent dragMove(receiverPos, event->possibleActions(), event->mimeData(), event->buttons(), event->modifiers());
+        event->setDropAction(d->lastDropAction);
+        QApplication::sendEvent(receiver, &dragMove);
+        event->setAccepted(dragMove.isAccepted());
+        event->setDropAction(dragMove.dropAction());
+        if (event->isAccepted())
+            d->lastDropAction = event->dropAction();
+        eventDelivered = true;
+        break;
+    }
+
+    if (!eventDelivered) {
+        if (d->dragDropWidget) {
+            // Leave the last drag drop item
+            QDragLeaveEvent dragLeave;
+            QApplication::sendEvent(d->dragDropWidget, &dragLeave);
+            d->dragDropWidget = 0;
+        }
+        // Propagate
+        event->setDropAction(Qt::IgnoreAction);
+    }
+#endif
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsProxyWidget::dropEvent(QGraphicsSceneDragDropEvent *event)
+{
+#ifdef QT_NO_DRAGANDDROP
+    Q_UNUSED(event);
+#else
+    Q_D(QGraphicsProxyWidget);
+    if (d->widget && d->dragDropWidget) {
+        QPoint widgetPos = d->mapToReceiver(event->pos(), d->dragDropWidget).toPoint();
+        QDropEvent dropEvent(widgetPos, event->possibleActions(), event->mimeData(), event->buttons(), event->modifiers());
+        QApplication::sendEvent(d->dragDropWidget, &dropEvent);
+        event->setAccepted(dropEvent.isAccepted());
+        d->dragDropWidget = 0;
+    }
+#endif
+}
+#endif
+
+/*!
+    \reimp
+*/
+void QGraphicsProxyWidget::hoverEnterEvent(QGraphicsSceneHoverEvent *event)
+{
+    Q_UNUSED(event);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsProxyWidget::hoverLeaveEvent(QGraphicsSceneHoverEvent *event)
+{
+    Q_UNUSED(event);
+    Q_D(QGraphicsProxyWidget);
+    // If hoverMove was compressed away, make sure we update properly here.
+    if (d->lastWidgetUnderMouse) {
+        QApplicationPrivate::dispatchEnterLeave(0, d->lastWidgetUnderMouse);
+        d->lastWidgetUnderMouse = 0;
+    }
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsProxyWidget::hoverMoveEvent(QGraphicsSceneHoverEvent *event)
+{
+    Q_D(QGraphicsProxyWidget);
+#ifdef GRAPHICSPROXYWIDGET_DEBUG
+    qDebug() << "QGraphicsProxyWidget::hoverMoveEvent";
+#endif
+    // Ignore events on the window frame.
+    if (!d->widget || !rect().contains(event->pos())) {
+        if (d->lastWidgetUnderMouse) {
+            QApplicationPrivate::dispatchEnterLeave(0, d->lastWidgetUnderMouse);
+            d->lastWidgetUnderMouse = 0;
+        }
+        return;
+    }
+
+    d->embeddedMouseGrabber = 0;
+    d->sendWidgetMouseEvent(event);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsProxyWidget::grabMouseEvent(QEvent *event)
+{
+    Q_UNUSED(event);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsProxyWidget::ungrabMouseEvent(QEvent *event)
+{
+    Q_D(QGraphicsProxyWidget);
+    Q_UNUSED(event);
+    d->embeddedMouseGrabber = 0;
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsProxyWidget::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
+{
+    Q_D(QGraphicsProxyWidget);
+#ifdef GRAPHICSPROXYWIDGET_DEBUG
+    qDebug() << "QGraphicsProxyWidget::mouseMoveEvent";
+#endif
+    d->sendWidgetMouseEvent(event);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsProxyWidget::mousePressEvent(QGraphicsSceneMouseEvent *event)
+{
+    Q_D(QGraphicsProxyWidget);
+#ifdef GRAPHICSPROXYWIDGET_DEBUG
+    qDebug() << "QGraphicsProxyWidget::mousePressEvent";
+#endif
+    d->sendWidgetMouseEvent(event);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsProxyWidget::mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event)
+{
+    Q_D(QGraphicsProxyWidget);
+#ifdef GRAPHICSPROXYWIDGET_DEBUG
+    qDebug() << "QGraphicsProxyWidget::mouseDoubleClickEvent";
+#endif
+    d->sendWidgetMouseEvent(event);
+}
+
+/*!
+    \reimp
+*/
+#ifndef QT_NO_WHEELEVENT
+void QGraphicsProxyWidget::wheelEvent(QGraphicsSceneWheelEvent *event)
+{
+    Q_D(QGraphicsProxyWidget);
+#ifdef GRAPHICSPROXYWIDGET_DEBUG
+    qDebug() << "QGraphicsProxyWidget::wheelEvent";
+#endif
+    if (!d->widget)
+        return;
+
+    QPointF pos = event->pos();
+    QPointer<QWidget> receiver = d->widget->childAt(pos.toPoint());
+    if (!receiver)
+        receiver = d->widget;
+
+    // Map event position from us to the receiver
+    pos = d->mapToReceiver(pos, receiver);
+
+    // Send mouse event.
+    QWheelEvent wheelEvent(pos.toPoint(), event->screenPos(), event->delta(),
+                           event->buttons(), event->modifiers(), event->orientation());
+    QPointer<QWidget> focusWidget = d->widget->focusWidget();
+    extern bool qt_sendSpontaneousEvent(QObject *, QEvent *);
+    qt_sendSpontaneousEvent(receiver, &wheelEvent);
+    event->setAccepted(wheelEvent.isAccepted());
+
+    // ### Remove, this should be done by proper focusIn/focusOut events.
+    if (focusWidget && !focusWidget->hasFocus()) {
+        focusWidget->update();
+        focusWidget = d->widget->focusWidget();
+        if (focusWidget && focusWidget->hasFocus())
+            focusWidget->update();
+    }
+}
+#endif
+
+/*!
+    \reimp
+*/
+void QGraphicsProxyWidget::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
+{
+    Q_D(QGraphicsProxyWidget);
+#ifdef GRAPHICSPROXYWIDGET_DEBUG
+    qDebug() << "QGraphicsProxyWidget::mouseReleaseEvent";
+#endif
+    d->sendWidgetMouseEvent(event);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsProxyWidget::keyPressEvent(QKeyEvent *event)
+{
+    Q_D(QGraphicsProxyWidget);
+#ifdef GRAPHICSPROXYWIDGET_DEBUG
+    qDebug() << "QGraphicsProxyWidget::keyPressEvent";
+#endif
+    d->sendWidgetKeyEvent(event);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsProxyWidget::keyReleaseEvent(QKeyEvent *event)
+{
+    Q_D(QGraphicsProxyWidget);
+#ifdef GRAPHICSPROXYWIDGET_DEBUG
+    qDebug() << "QGraphicsProxyWidget::keyReleaseEvent";
+#endif
+    d->sendWidgetKeyEvent(event);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsProxyWidget::focusInEvent(QFocusEvent *event)
+{
+#ifdef GRAPHICSPROXYWIDGET_DEBUG
+    qDebug() << "QGraphicsProxyWidget::focusInEvent";
+#endif
+    Q_D(QGraphicsProxyWidget);
+
+    if (d->focusFromWidgetToProxy) {
+        // Prevent recursion when the proxy autogains focus through the
+        // embedded widget calling setFocus(). ### Could be done with event
+        // filter on FocusIn instead?
+        return;
+    }
+
+    switch (event->reason()) {
+    case Qt::TabFocusReason: {
+	if (QWidget *focusChild = d->findFocusChild(0, true))
+            focusChild->setFocus(event->reason());
+        break;
+    }
+    case Qt::BacktabFocusReason:
+	if (QWidget *focusChild = d->findFocusChild(0, false))
+            focusChild->setFocus(event->reason());
+        break;
+    default:
+	if (d->widget && d->widget->focusWidget()) {
+	    d->widget->focusWidget()->setFocus(event->reason());
+	    return;
+	}
+	break;
+    }
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsProxyWidget::focusOutEvent(QFocusEvent *event)
+{
+#ifdef GRAPHICSPROXYWIDGET_DEBUG
+    qDebug() << "QGraphicsProxyWidget::focusOutEvent";
+#endif
+    Q_D(QGraphicsProxyWidget);
+    if (d->widget) {
+        // We need to explicitly remove subfocus from the embedded widget's
+        // focus widget.
+        if (QWidget *focusWidget = d->widget->focusWidget())
+            d->removeSubFocusHelper(focusWidget, event->reason());
+    }
+}
+
+/*!
+    \reimp
+*/
+bool QGraphicsProxyWidget::focusNextPrevChild(bool next)
+{
+    Q_D(QGraphicsProxyWidget);
+    if (!d->widget || !d->scene)
+        return QGraphicsWidget::focusNextPrevChild(next);
+
+    Qt::FocusReason reason = next ? Qt::TabFocusReason : Qt::BacktabFocusReason;
+    QWidget *lastFocusChild = d->widget->focusWidget();
+    if (QWidget *newFocusChild = d->findFocusChild(lastFocusChild, next)) {
+	newFocusChild->setFocus(reason);
+	return true;
+    }
+
+    return QGraphicsWidget::focusNextPrevChild(next);
+}
+
+/*!
+    \reimp
+*/
+QSizeF QGraphicsProxyWidget::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
+{
+    Q_D(const QGraphicsProxyWidget);
+    if (!d->widget)
+        return QGraphicsWidget::sizeHint(which, constraint);
+
+    QSizeF sh;
+    switch (which) {
+    case Qt::PreferredSize:
+        if (QLayout *l = d->widget->layout())
+            sh = l->sizeHint();
+        else
+            sh = d->widget->sizeHint();
+        break;
+    case Qt::MinimumSize:
+        if (QLayout *l = d->widget->layout())
+            sh = l->minimumSize();
+        else
+            sh = d->widget->minimumSizeHint();
+        break;
+    case Qt::MaximumSize:
+        if (QLayout *l = d->widget->layout())
+            sh = l->maximumSize();
+        else
+            sh = QSizeF(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX);
+        break;
+    case Qt::MinimumDescent:
+        sh = constraint;
+        break;
+    default:
+        break;
+    }
+    return sh;
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsProxyWidget::resizeEvent(QGraphicsSceneResizeEvent *event)
+{
+    Q_D(QGraphicsProxyWidget);
+    if (d->widget) {
+        if (d->sizeChangeMode != QGraphicsProxyWidgetPrivate::WidgetToProxyMode)
+            d->widget->resize(event->newSize().toSize());
+    }
+    QGraphicsWidget::resizeEvent(event);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsProxyWidget::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
+{
+    Q_D(QGraphicsProxyWidget);
+    Q_UNUSED(widget);
+    if (!d->widget || !d->widget->isVisible())
+        return;
+
+    // Filter out repaints on the window frame.
+    const QRect exposedWidgetRect = (option->exposedRect & rect()).toRect();
+    if (exposedWidgetRect.isEmpty())
+        return;
+
+    // Disable QPainter's default pen being cosmetic. This allows widgets and
+    // styles to follow Qt's existing defaults without getting ugly cosmetic
+    // lines when scaled.
+    bool restore = !(painter->renderHints() & QPainter::NonCosmeticDefaultPen);
+    painter->setRenderHints(QPainter::NonCosmeticDefaultPen, true);
+
+    d->widget->render(painter, exposedWidgetRect.topLeft(), exposedWidgetRect);
+
+    // Restore the render hints if necessary.
+    if (restore)
+        painter->setRenderHints(QPainter::NonCosmeticDefaultPen, false);
+}
+
+/*!
+    \reimp
+*/
+int QGraphicsProxyWidget::type() const
+{
+    return Type;
+}
+
+/*!
+  \since 4.5
+
+  Creates a proxy widget for the given \a child of the widget
+  contained in this proxy.
+  
+  This function makes it possible to aquire proxies for
+  non top-level widgets. For instance, you can embed a dialog,
+  and then transform only one of its widgets.
+
+  If the widget is already embedded, return the existing proxy widget.
+
+  \sa newProxyWidget(), QGraphicsScene::addWidget()
+*/
+QGraphicsProxyWidget *QGraphicsProxyWidget::createProxyForChildWidget(QWidget *child)
+{
+    QGraphicsProxyWidget *proxy = child->graphicsProxyWidget();
+    if (proxy)
+        return proxy;
+    if (!child->parentWidget()) {
+        qWarning("QGraphicsProxyWidget::createProxyForChildWidget: top-level widget not in a QGraphicsScene");
+        return 0;
+    }
+
+    QGraphicsProxyWidget *parentProxy = createProxyForChildWidget(child->parentWidget());
+    if (!parentProxy)
+        return 0;
+
+    if (!QMetaObject::invokeMethod(parentProxy, "newProxyWidget",  Qt::DirectConnection,
+         Q_RETURN_ARG(QGraphicsProxyWidget*, proxy), Q_ARG(const QWidget*, child)))
+        return 0;
+    proxy->setParent(parentProxy);
+    proxy->setWidget(child);
+    return proxy;
+}
+
+/*!
+  \fn QGraphicsProxyWidget *QGraphicsProxyWidget::newProxyWidget(const QWidget *child)
+  \since 4.5
+
+  Creates a proxy widget for the given \a child of the widget contained in this
+  proxy.
+
+  You should not call this function directly; use
+  QGraphicsProxyWidget::createProxyForChildWidget() instead.
+
+  This function is a fake virtual slot that you can reimplement in
+  your subclass in order to control how new proxy widgets are
+  created. The default implementation returns a proxy created with
+  the QGraphicsProxyWidget() constructor with this proxy widget as
+  the parent.
+
+  \sa createProxyForChildWidget()
+*/
+QGraphicsProxyWidget *QGraphicsProxyWidget::newProxyWidget(const QWidget *)
+{
+    return new QGraphicsProxyWidget(this);
+}
+
+
+
+QT_END_NAMESPACE
+
+#include "moc_qgraphicsproxywidget.cpp"
+
+#endif //QT_NO_GRAPHICSVIEW
diff --git a/src/gui/graphicsview/qgraphicsproxywidget.h b/src/gui/graphicsview/qgraphicsproxywidget.h
new file mode 100644
index 0000000..ab8c9da
--- /dev/null
+++ b/src/gui/graphicsview/qgraphicsproxywidget.h
@@ -0,0 +1,147 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QGRAPHICSPROXYWIDGET_H
+#define QGRAPHICSPROXYWIDGET_H
+
+#include <QtGui/qgraphicswidget.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Gui)
+
+#if !defined(QT_NO_GRAPHICSVIEW) || (QT_EDITION & QT_MODULE_GRAPHICSVIEW) != QT_MODULE_GRAPHICSVIEW
+
+class QGraphicsProxyWidgetPrivate;
+
+class Q_GUI_EXPORT QGraphicsProxyWidget : public QGraphicsWidget
+{
+    Q_OBJECT
+public:
+    QGraphicsProxyWidget(QGraphicsItem *parent = 0, Qt::WindowFlags wFlags = 0);
+    ~QGraphicsProxyWidget();
+
+    void setWidget(QWidget *widget);
+    QWidget *widget() const;
+
+    QRectF subWidgetRect(const QWidget *widget) const;
+
+    void setGeometry(const QRectF &rect);
+
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
+
+    enum {
+        Type = 12
+    };
+    int type() const;
+
+    QGraphicsProxyWidget *createProxyForChildWidget(QWidget *child);
+
+protected:
+    QVariant itemChange(GraphicsItemChange change, const QVariant &value);
+
+    bool event(QEvent *event);
+    bool eventFilter(QObject *object, QEvent *event);
+
+    void showEvent(QShowEvent *event);
+    void hideEvent(QHideEvent *event);
+
+#ifndef QT_NO_CONTEXTMENU
+    void contextMenuEvent(QGraphicsSceneContextMenuEvent *event);
+#endif
+
+#ifndef QT_NO_DRAGANDDROP
+    void dragEnterEvent(QGraphicsSceneDragDropEvent *event);
+    void dragLeaveEvent(QGraphicsSceneDragDropEvent *event);
+    void dragMoveEvent(QGraphicsSceneDragDropEvent *event);
+    void dropEvent(QGraphicsSceneDragDropEvent *event);
+#endif
+
+    void hoverEnterEvent(QGraphicsSceneHoverEvent *event);
+    void hoverLeaveEvent(QGraphicsSceneHoverEvent *event);
+    void hoverMoveEvent(QGraphicsSceneHoverEvent *event);
+    void grabMouseEvent(QEvent *event);
+    void ungrabMouseEvent(QEvent *event);
+
+    void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
+    void mousePressEvent(QGraphicsSceneMouseEvent *event);
+    void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
+    void mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event);
+#ifndef QT_NO_WHEELEVENT
+    void wheelEvent(QGraphicsSceneWheelEvent *event);
+#endif
+
+    void keyPressEvent(QKeyEvent *event);
+    void keyReleaseEvent(QKeyEvent *event);
+
+    void focusInEvent(QFocusEvent *event);
+    void focusOutEvent(QFocusEvent *event);
+    bool focusNextPrevChild(bool next);
+    // ### Qt 4.5:
+    // QVariant inputMethodQuery(Qt::InputMethodQuery query) const;
+    // void inputMethodEvent(QInputMethodEvent *event);
+
+    QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint = QSizeF()) const;
+    void resizeEvent(QGraphicsSceneResizeEvent *event);
+
+protected Q_SLOTS:
+    QGraphicsProxyWidget *newProxyWidget(const QWidget *);
+
+private:
+    Q_DISABLE_COPY(QGraphicsProxyWidget)
+    Q_DECLARE_PRIVATE_D(QGraphicsItem::d_ptr, QGraphicsProxyWidget)
+    Q_PRIVATE_SLOT(d_func(), void _q_removeWidgetSlot())
+
+    friend class QWidget;
+    friend class QWidgetPrivate;
+    friend class QGraphicsItem;
+};
+
+#endif
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif
+
diff --git a/src/gui/graphicsview/qgraphicsproxywidget_p.h b/src/gui/graphicsview/qgraphicsproxywidget_p.h
new file mode 100644
index 0000000..5985eed
--- /dev/null
+++ b/src/gui/graphicsview/qgraphicsproxywidget_p.h
@@ -0,0 +1,125 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QGRAPHICSPROXYWIDGET_P_H
+#define QGRAPHICSPROXYWIDGET_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of qapplication_*.cpp, qwidget*.cpp and qfiledialog.cpp.  This header
+// file may change from version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "qgraphicsproxywidget.h"
+#include "private/qgraphicswidget_p.h"
+
+#if !defined(QT_NO_GRAPHICSVIEW) || (QT_EDITION & QT_MODULE_GRAPHICSVIEW) != QT_MODULE_GRAPHICSVIEW
+
+QT_BEGIN_NAMESPACE
+
+class QGraphicsProxyWidgetPrivate : public QGraphicsWidgetPrivate
+{
+    Q_DECLARE_PUBLIC(QGraphicsProxyWidget)
+public:
+    QGraphicsProxyWidgetPrivate()
+        : dragDropWidget(0),
+          posChangeMode(NoMode),
+          sizeChangeMode(NoMode),
+          visibleChangeMode(NoMode),
+          enabledChangeMode(NoMode),
+          styleChangeMode(NoMode),
+          paletteChangeMode(NoMode),
+          focusFromWidgetToProxy(0)
+    { }
+    void init();
+    void sendWidgetMouseEvent(QGraphicsSceneMouseEvent *event);
+    void sendWidgetMouseEvent(QGraphicsSceneHoverEvent *event);
+    void sendWidgetKeyEvent(QKeyEvent *event);
+    void setWidget_helper(QWidget *widget, bool autoShow);
+
+    QWidget *findFocusChild(QWidget *child, bool next) const;
+    void removeSubFocusHelper(QWidget *widget, Qt::FocusReason reason);
+
+    // ### Qt 5: Remove. Workaround for reimplementation added after Qt 4.4.
+    QVariant inputMethodQueryHelper(Qt::InputMethodQuery query) const;
+
+    void _q_removeWidgetSlot();
+
+    void embedSubWindow(QWidget *);
+    void unembedSubWindow(QWidget *);
+
+    bool isProxyWidget() const;
+
+    QPointer<QWidget> widget;
+    QPointer<QWidget> lastWidgetUnderMouse;
+    QPointer<QWidget> embeddedMouseGrabber;
+    QWidget *dragDropWidget;
+    Qt::DropAction lastDropAction;
+
+    void updateWidgetGeometryFromProxy();
+    void updateProxyGeometryFromWidget();
+
+    QPointF mapToReceiver(const QPointF &pos, const QWidget *receiver) const;
+
+    enum ChangeMode {
+        NoMode,
+        ProxyToWidgetMode,
+        WidgetToProxyMode
+    };
+    quint32 posChangeMode : 2;
+    quint32 sizeChangeMode : 2;
+    quint32 visibleChangeMode : 2;
+    quint32 enabledChangeMode : 2;
+    quint32 styleChangeMode : 2;
+    quint32 paletteChangeMode : 2;
+    quint32 focusFromWidgetToProxy : 1;
+};
+
+QT_END_NAMESPACE
+
+#endif
+
+#endif
diff --git a/src/gui/graphicsview/qgraphicsscene.cpp b/src/gui/graphicsview/qgraphicsscene.cpp
new file mode 100644
index 0000000..1f78a18
--- /dev/null
+++ b/src/gui/graphicsview/qgraphicsscene.cpp
@@ -0,0 +1,5360 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+static const int QGRAPHICSSCENE_INDEXTIMER_TIMEOUT = 2000;
+
+/*!
+    \class QGraphicsScene
+    \brief The QGraphicsScene class provides a surface for managing a large
+    number of 2D graphical items.
+    \since 4.2
+    \ingroup multimedia
+    \ingroup graphicsview-api
+    \mainclass
+
+    The class serves as a container for QGraphicsItems. It is used together
+    with QGraphicsView for visualizing graphical items, such as lines,
+    rectangles, text, or even custom items, on a 2D surface. QGraphicsScene is
+    part of \l{The Graphics View Framework}.
+
+    QGraphicsScene also provides functionality that lets you efficiently
+    determine both the location of items, and for determining what items are
+    visible within an arbitrary area on the scene. With the QGraphicsView
+    widget, you can either visualize the whole scene, or zoom in and view only
+    parts of the scene.
+
+    Example:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsscene.cpp 0
+
+    Note that QGraphicsScene has no visual appearance of its own; it only
+    manages the items. You need to create a QGraphicsView widget to visualize
+    the scene.
+
+    To add items to a scene, you start off by constructing a QGraphicsScene
+    object. Then, you have two options: either add your existing QGraphicsItem
+    objects by calling addItem(), or you can call one of the convenience
+    functions addEllipse(), addLine(), addPath(), addPixmap(), addPolygon(),
+    addRect(), or addText(), which all return a pointer to the newly added item.
+    The dimensions of the items added with these functions are relative to the
+    item's coordinate system, and the items position is initialized to (0,
+    0) in the scene.
+
+    You can then visualize the scene using QGraphicsView. When the scene
+    changes, (e.g., when an item moves or is transformed) QGraphicsScene
+    emits the changed() signal. To remove an item, call removeItem().
+
+    QGraphicsScene uses an indexing algorithm to manage the location of items
+    efficiently. By default, a BSP (Binary Space Partitioning) tree is used; an
+    algorithm suitable for large scenes where most items remain static (i.e.,
+    do not move around). You can choose to disable this index by calling
+    setItemIndexMethod(). For more information about the available indexing
+    algorithms, see the itemIndexMethod property.
+
+    The scene's bounding rect is set by calling setSceneRect(). Items can be
+    placed at any position on the scene, and the size of the scene is by
+    default unlimited. The scene rect is used only for internal bookkeeping,
+    maintaining the scene's item index. If the scene rect is unset,
+    QGraphicsScene will use the bounding area of all items, as returned by
+    itemsBoundingRect(), as the scene rect. However, itemsBoundingRect() is a
+    relatively time consuming function, as it operates by collecting
+    positional information for every item on the scene. Because of this, you
+    should always set the scene rect when operating on large scenes.
+
+    One of QGraphicsScene's greatest strengths is its ability to efficiently
+    determine the location of items. Even with millions of items on the scene,
+    the items() functions can determine the location of an item within few
+    milliseconds. There are several overloads to items(): one that finds items
+    at a certain position, one that finds items inside or intersecting with a
+    polygon or a rectangle, and more. The list of returned items is sorted by
+    stacking order, with the topmost item being the first item in the list.
+    For convenience, there is also an itemAt() function that returns the
+    topmost item at a given position.
+
+    QGraphicsScene maintains selection information for the scene. To select
+    items, call setSelectionArea(), and to clear the current selection, call
+    clearSelection(). Call selectedItems() to get the list of all selected
+    items.
+
+    \section1 Event Handling and Propagation
+
+    Another responsibility that QGraphicsScene has, is to propagate events
+    from QGraphicsView. To send an event to a scene, you construct an event
+    that inherits QEvent, and then send it using, for example,
+    QApplication::sendEvent(). event() is responsible for dispatching
+    the event to the individual items. Some common events are handled by
+    convenience event handlers. For example, key press events are handled by
+    keyPressEvent(), and mouse press events are handled by mousePressEvent().
+
+    Key events are delivered to the \e {focus item}. To set the focus item,
+    you can either call setFocusItem(), passing an item that accepts focus, or
+    the item itself can call QGraphicsItem::setFocus().  Call focusItem() to
+    get the current focus item. For compatibility with widgets, the scene also
+    maintains its own focus information. By default, the scene does not have
+    focus, and all key events are discarded. If setFocus() is called, or if an
+    item on the scene gains focus, the scene automatically gains focus. If the
+    scene has focus, hasFocus() will return true, and key events will be
+    forwarded to the focus item, if any. If the scene loses focus, (i.e.,
+    someone calls clearFocus(),) while an item has focus, the scene will
+    maintain its item focus information, and once the scene regains focus, it
+    will make sure the last focus item regains focus.
+
+    For mouse-over effects, QGraphicsScene dispatches \e {hover
+    events}. If an item accepts hover events (see
+    QGraphicsItem::acceptHoverEvents()), it will receive a \l
+    {QEvent::}{GraphicsSceneHoverEnter} event when the mouse enters
+    its area. As the mouse continues moving inside the item's area,
+    QGraphicsScene will send it \l {QEvent::}{GraphicsSceneHoverMove}
+    events. When the mouse leaves the item's area, the item will
+    receive a \l {QEvent::}{GraphicsSceneHoverLeave} event.
+
+    All mouse events are delivered to the current \e {mouse grabber}
+    item. An item becomes the scene's mouse grabber if it accepts
+    mouse events (see QGraphicsItem::acceptedMouseButtons()) and it
+    receives a mouse press. It stays the mouse grabber until it
+    receives a mouse release when no other mouse buttons are
+    pressed. You can call mouseGrabberItem() to determine what item is
+    currently grabbing the mouse.
+
+    \sa QGraphicsItem, QGraphicsView
+*/
+
+/*!
+    \enum QGraphicsScene::SceneLayer
+    \since 4.3
+
+    This enum describes the rendering layers in a QGraphicsScene. When
+    QGraphicsScene draws the scene contents, it renders each of these layers
+    separately, in order.
+
+    Each layer represents a flag that can be OR'ed together when calling
+    functions such as invalidate() or QGraphicsView::invalidateScene().
+
+    \value ItemLayer The item layer. QGraphicsScene renders all items are in
+    this layer by calling the virtual function drawItems(). The item layer is
+    drawn after the background layer, but before the foreground layer.
+
+    \value BackgroundLayer The background layer. QGraphicsScene renders the
+    scene's background in this layer by calling the virtual function
+    drawBackground(). The background layer is drawn first of all layers.
+
+    \value ForegroundLayer The foreground layer. QGraphicsScene renders the
+    scene's foreground in this layer by calling the virtual function
+    drawForeground().  The foreground layer is drawn last of all layers.
+
+    \value AllLayers All layers; this value represents a combination of all
+    three layers.
+
+    \sa invalidate(), QGraphicsView::invalidateScene()
+*/
+
+/*!
+    \enum QGraphicsScene::ItemIndexMethod
+
+    This enum describes the indexing algorithms QGraphicsScene provides for
+    managing positional information about items on the scene.
+
+    \value BspTreeIndex A Binary Space Partitioning tree is applied. All
+    QGraphicsScene's item location algorithms are of an order close to
+    logarithmic complexity, by making use of binary search. Adding, moving and
+    removing items is logarithmic. This approach is best for static scenes
+    (i.e., scenes where most items do not move).
+
+    \value NoIndex No index is applied. Item location is of linear complexity,
+    as all items on the scene are searched. Adding, moving and removing items,
+    however, is done in constant time. This approach is ideal for dynamic
+    scenes, where many items are added, moved or removed continuously.
+
+    \sa setItemIndexMethod(), bspTreeDepth
+*/
+
+#include "qgraphicsscene.h"
+
+#ifndef QT_NO_GRAPHICSVIEW
+
+#include "qgraphicsitem.h"
+#include "qgraphicsitem_p.h"
+#include "qgraphicslayout.h"
+#include "qgraphicsscene_p.h"
+#include "qgraphicssceneevent.h"
+#include "qgraphicsview.h"
+#include "qgraphicsview_p.h"
+#include "qgraphicswidget.h"
+#include "qgraphicswidget_p.h"
+
+#include <QtCore/qdebug.h>
+#include <QtCore/qlist.h>
+#include <QtCore/qmath.h>
+#include <QtCore/qrect.h>
+#include <QtCore/qset.h>
+#include <QtCore/qstack.h>
+#include <QtCore/qtimer.h>
+#include <QtCore/qvarlengtharray.h>
+#include <QtGui/qapplication.h>
+#include <QtGui/qdesktopwidget.h>
+#include <QtGui/qevent.h>
+#include <QtGui/qgraphicslayout.h>
+#include <QtGui/qgraphicsproxywidget.h>
+#include <QtGui/qgraphicswidget.h>
+#include <QtGui/qmatrix.h>
+#include <QtGui/qpaintengine.h>
+#include <QtGui/qpainter.h>
+#include <QtGui/qpixmapcache.h>
+#include <QtGui/qpolygon.h>
+#include <QtGui/qstyleoption.h>
+#include <QtGui/qtooltip.h>
+#include <QtGui/qtransform.h>
+#include <private/qapplication_p.h>
+#include <private/qobject_p.h>
+#ifdef Q_WS_X11
+#include <private/qt_x11_p.h>
+#endif
+
+QT_BEGIN_NAMESPACE
+
+static inline bool QRectF_intersects(const QRectF &s, const QRectF &r)
+{
+    qreal xp = s.left();
+    qreal yp = s.top();
+    qreal w = s.width();
+    qreal h = s.height();
+    qreal l1 = xp;
+    qreal r1 = xp;
+    if (w < 0)
+        l1 += w;
+    else
+        r1 += w;
+
+    qreal l2 = r.left();
+    qreal r2 = r.left();
+    if (w < 0)
+        l2 += r.width();
+    else
+        r2 += r.width();
+
+    if (l1 >= r2 || l2 >= r1)
+        return false;
+
+    qreal t1 = yp;
+    qreal b1 = yp;
+    if (h < 0)
+        t1 += h;
+    else
+        b1 += h;
+
+    qreal t2 = r.top();
+    qreal b2 = r.top();
+    if (r.height() < 0)
+        t2 += r.height();
+    else
+        b2 += r.height();
+
+    return !(t1 >= b2 || t2 >= b1);
+}
+
+// QRectF::intersects() returns false always if either the source or target
+// rectangle's width or height are 0. This works around that problem.
+static QRectF _q_adjustedRect(const QRectF &rect)
+{
+    static const qreal p = (qreal)0.00001;
+    QRectF r = rect;
+    if (!r.width())
+        r.adjust(-p, 0, p, 0);
+    if (!r.height())
+        r.adjust(0, -p, 0, p);
+    return r;
+}
+
+static void _q_hoverFromMouseEvent(QGraphicsSceneHoverEvent *hover, const QGraphicsSceneMouseEvent *mouseEvent)
+{
+    hover->setWidget(mouseEvent->widget());
+    hover->setPos(mouseEvent->pos());
+    hover->setScenePos(mouseEvent->scenePos());
+    hover->setScreenPos(mouseEvent->screenPos());
+    hover->setLastPos(mouseEvent->lastPos());
+    hover->setLastScenePos(mouseEvent->lastScenePos());
+    hover->setLastScreenPos(mouseEvent->lastScreenPos());
+    hover->setModifiers(mouseEvent->modifiers());
+    hover->setAccepted(mouseEvent->isAccepted());
+}
+
+/*!
+    \internal
+*/
+QGraphicsScenePrivate::QGraphicsScenePrivate()
+    : changedSignalMask(0),
+      indexMethod(QGraphicsScene::BspTreeIndex),
+      bspTreeDepth(0),
+      lastItemCount(0),
+      hasSceneRect(false),
+      updateAll(false),
+      calledEmitUpdated(false),
+      selectionChanging(0),
+      dirtyItemResetPending(false),
+      regenerateIndex(true),
+      purgePending(false),
+      indexTimerId(0),
+      restartIndexTimer(false),
+      stickyFocus(false),
+      hasFocus(false),
+      focusItem(0),
+      lastFocusItem(0),
+      tabFocusFirst(0),
+      activeWindow(0),
+      activationRefCount(0),
+      lastMouseGrabberItem(0),
+      lastMouseGrabberItemHasImplicitMouseGrab(false),
+      dragDropItem(0),
+      enterWidget(0),
+      lastDropAction(Qt::IgnoreAction),
+      painterStateProtection(true),
+      sortCacheEnabled(false),
+      updatingSortCache(false),
+      style(0)
+{
+}
+
+/*!
+    \internal
+*/
+void QGraphicsScenePrivate::init()
+{
+    Q_Q(QGraphicsScene);
+
+    // Keep this index so we can check for connected slots later on.
+    changedSignalMask = (1 << q->metaObject()->indexOfSignal("changed(QList<QRectF>)"));
+    qApp->d_func()->scene_list.append(q);
+    q->update();
+}
+
+/*!
+    \internal
+*/
+QList<QGraphicsItem *> QGraphicsScenePrivate::estimateItemsInRect(const QRectF &rect) const
+{
+    const_cast<QGraphicsScenePrivate *>(this)->purgeRemovedItems();
+    const_cast<QGraphicsScenePrivate *>(this)->_q_updateSortCache();
+
+    if (indexMethod == QGraphicsScene::BspTreeIndex) {
+        // ### Only do this once in a while.
+        QGraphicsScenePrivate *that = const_cast<QGraphicsScenePrivate *>(this);
+
+        // Get items from BSP tree
+        QList<QGraphicsItem *> items = that->bspTree.items(rect);
+
+        // Fill in with any unindexed items
+        for (int i = 0; i < unindexedItems.size(); ++i) {
+            if (QGraphicsItem *item = unindexedItems.at(i)) {
+                if (!item->d_ptr->itemDiscovered && item->d_ptr->visible && !(item->d_ptr->ancestorFlags & QGraphicsItemPrivate::AncestorClipsChildren)) {
+                    QRectF boundingRect = item->sceneBoundingRect();
+                    if (QRectF_intersects(boundingRect, rect)) {
+                        item->d_ptr->itemDiscovered = 1;
+                        items << item;
+                    }
+                }
+            }
+        }
+
+        // Reset the discovered state of all discovered items
+        for (int i = 0; i < items.size(); ++i)
+            items.at(i)->d_func()->itemDiscovered = 0;
+        return items;
+    }
+
+    QList<QGraphicsItem *> itemsInRect;
+    for (int i = 0; i < unindexedItems.size(); ++i) {
+        if (QGraphicsItem *item = unindexedItems.at(i)) {
+            if (item->d_ptr->ancestorFlags & QGraphicsItemPrivate::AncestorClipsChildren)
+                continue;
+            if (item->d_ptr->visible && item->effectiveOpacity() > qreal(0.0))
+                itemsInRect << item;
+        }
+    }
+    for (int i = 0; i < indexedItems.size(); ++i) {
+        if (QGraphicsItem *item = indexedItems.at(i)) {
+            if (item->d_ptr->ancestorFlags & QGraphicsItemPrivate::AncestorClipsChildren)
+                continue;
+            if (item->d_ptr->visible && item->effectiveOpacity() > qreal(0.0))
+                itemsInRect << item;
+        }
+    }
+
+    return itemsInRect;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsScenePrivate::addToIndex(QGraphicsItem *item)
+{
+    if (indexMethod == QGraphicsScene::BspTreeIndex) {
+        if (item->d_func()->index != -1) {
+            bspTree.insertItem(item, item->sceneBoundingRect());
+            foreach (QGraphicsItem *child, item->children())
+                child->addToIndex();
+        } else {
+            // The BSP tree is regenerated if the number of items grows to a
+            // certain threshold, or if the bounding rect of the graph doubles in
+            // size.
+            startIndexTimer();
+        }
+    }
+}
+
+/*!
+    \internal
+*/
+void QGraphicsScenePrivate::removeFromIndex(QGraphicsItem *item)
+{
+    if (indexMethod == QGraphicsScene::BspTreeIndex) {
+        int index = item->d_func()->index;
+        if (index != -1) {
+            bspTree.removeItem(item, item->sceneBoundingRect());
+            freeItemIndexes << index;
+            indexedItems[index] = 0;
+            item->d_func()->index = -1;
+            unindexedItems << item;
+
+            foreach (QGraphicsItem *child, item->children())
+                child->removeFromIndex();
+        }
+
+        startIndexTimer();
+    }
+}
+
+/*!
+    \internal
+*/
+void QGraphicsScenePrivate::resetIndex()
+{
+    purgeRemovedItems();
+    if (indexMethod == QGraphicsScene::BspTreeIndex) {
+        for (int i = 0; i < indexedItems.size(); ++i) {
+            if (QGraphicsItem *item = indexedItems.at(i)) {
+                item->d_ptr->index = -1;
+                unindexedItems << item;
+            }
+        }
+        indexedItems.clear();
+        freeItemIndexes.clear();
+        regenerateIndex = true;
+        startIndexTimer();
+    }
+}
+
+static inline int intmaxlog(int n)
+{
+    return  (n > 0 ? qMax(qCeil(qLn(qreal(n)) / qLn(qreal(2))), 5) : 0);
+}
+
+/*!
+    \internal
+*/
+void QGraphicsScenePrivate::_q_updateIndex()
+{
+    if (!indexTimerId)
+        return;
+
+    Q_Q(QGraphicsScene);
+    q->killTimer(indexTimerId);
+    indexTimerId = 0;
+
+    purgeRemovedItems();
+
+    // Add unindexedItems to indexedItems
+    QRectF unindexedItemsBoundingRect;
+    for (int i = 0; i < unindexedItems.size(); ++i) {
+        if (QGraphicsItem *item = unindexedItems.at(i)) {
+            unindexedItemsBoundingRect |= item->sceneBoundingRect();
+            if (!freeItemIndexes.isEmpty()) {
+                int freeIndex = freeItemIndexes.takeFirst();
+                item->d_func()->index = freeIndex;
+                indexedItems[freeIndex] = item;
+            } else {
+                item->d_func()->index = indexedItems.size();
+                indexedItems << item;
+            }
+        }
+    }
+
+    // Update growing scene rect.
+    QRectF oldGrowingItemsBoundingRect = growingItemsBoundingRect;
+    growingItemsBoundingRect |= unindexedItemsBoundingRect;
+
+    // Determine whether we should regenerate the BSP tree.
+    if (indexMethod == QGraphicsScene::BspTreeIndex) {
+        int depth = bspTreeDepth;
+        if (depth == 0) {
+            int oldDepth = intmaxlog(lastItemCount);
+            depth = intmaxlog(indexedItems.size());
+            static const int slack = 100;
+            if (bspTree.leafCount() == 0 || (oldDepth != depth && qAbs(lastItemCount - indexedItems.size()) > slack)) {
+                // ### Crude algorithm.
+                regenerateIndex = true;
+            }
+        }
+
+        // Regenerate the tree.
+        if (regenerateIndex) {
+            regenerateIndex = false;
+            bspTree.initialize(q->sceneRect(), depth);
+            unindexedItems = indexedItems;
+            lastItemCount = indexedItems.size();
+            q->update();
+
+            // Take this opportunity to reset our largest-item counter for
+            // untransformable items. When the items are inserted into the BSP
+            // tree, we'll get an accurate calculation.
+            largestUntransformableItem = QRectF();
+        }
+    }
+
+    // Insert all unindexed items into the tree.
+    for (int i = 0; i < unindexedItems.size(); ++i) {
+        if (QGraphicsItem *item = unindexedItems.at(i)) {
+            QRectF rect = item->sceneBoundingRect();
+            if (item->d_ptr->ancestorFlags & QGraphicsItemPrivate::AncestorClipsChildren)
+                continue;
+            if (indexMethod == QGraphicsScene::BspTreeIndex)
+                bspTree.insertItem(item, rect);
+
+            // If the item ignores view transformations, update our
+            // largest-item-counter to ensure that the view can accurately
+            // discover untransformable items when drawing.
+            if (item->d_ptr->itemIsUntransformable()) {
+                QGraphicsItem *topmostUntransformable = item;
+                while (topmostUntransformable && (topmostUntransformable->d_ptr->ancestorFlags
+                                                  & QGraphicsItemPrivate::AncestorIgnoresTransformations)) {
+                    topmostUntransformable = topmostUntransformable->parentItem();
+                }
+                // ### Verify that this is the correct largest untransformable rectangle.
+                largestUntransformableItem |= item->mapToItem(topmostUntransformable, item->boundingRect()).boundingRect();
+            }
+        }
+    }
+    unindexedItems.clear();
+
+    // Notify scene rect changes.
+    if (!hasSceneRect && growingItemsBoundingRect != oldGrowingItemsBoundingRect)
+        emit q->sceneRectChanged(growingItemsBoundingRect);
+}
+
+/*!
+    \internal
+*/
+void QGraphicsScenePrivate::_q_emitUpdated()
+{
+    Q_Q(QGraphicsScene);
+    calledEmitUpdated = false;
+
+    // Ensure all views are connected if anything is connected. This disables
+    // the optimization that items send updates directly to the views, but it
+    // needs to happen in order to keep compatibility with the behavior from
+    // Qt 4.4 and backward.
+    if (!views.isEmpty() && (connectedSignals & changedSignalMask)) {
+        for (int i = 0; i < views.size(); ++i) {
+            QGraphicsView *view = views.at(i);
+            if (!view->d_func()->connectedToScene) {
+                view->d_func()->connectedToScene = true;
+                q->connect(q, SIGNAL(changed(QList<QRectF>)),
+                           views.at(i), SLOT(updateScene(QList<QRectF>)));
+            }
+        }
+    }
+
+    // Ensure all dirty items's current positions are recorded in the list of
+    // updated rects.
+    for (int i = 0; i < dirtyItems.size(); ++i)
+        updatedRects += dirtyItems.at(i)->sceneBoundingRect();
+
+    // Notify the changes to anybody interested.
+    QList<QRectF> oldUpdatedRects;
+    oldUpdatedRects = updateAll ? (QList<QRectF>() << q->sceneRect()) : updatedRects;
+    updateAll = false;
+    updatedRects.clear();
+    emit q->changed(oldUpdatedRects);
+}
+
+/*!
+    \internal
+
+    Updates all items in the pending update list. At this point, the list is
+    unlikely to contain partially constructed items.
+*/
+void QGraphicsScenePrivate::_q_updateLater()
+{
+    foreach (QGraphicsItem *item, pendingUpdateItems)
+        item->update();
+    pendingUpdateItems.clear();
+}
+
+/*!
+    \internal
+*/
+void QGraphicsScenePrivate::_q_polishItems()
+{
+    foreach (QGraphicsItem *item, unpolishedItems) {
+        if (!item->d_ptr->explicitlyHidden) {
+            item->itemChange(QGraphicsItem::ItemVisibleChange, true);
+            item->itemChange(QGraphicsItem::ItemVisibleHasChanged, true);
+        }
+        if (item->isWidget()) {
+            QEvent event(QEvent::Polish);
+            QApplication::sendEvent((QGraphicsWidget *)item, &event);
+        }
+    }
+    unpolishedItems.clear();
+}
+
+/*!
+    \internal
+*/
+void QGraphicsScenePrivate::_q_resetDirtyItems()
+{
+    for (int i = 0; i < dirtyItems.size(); ++i) {
+        QGraphicsItem *item = dirtyItems.at(i);
+        item->d_ptr->dirty = 0;
+        item->d_ptr->dirtyChildren = 0;
+    }
+    dirtyItems.clear();
+    dirtyItemResetPending = false;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsScenePrivate::resetDirtyItemsLater()
+{
+    Q_Q(QGraphicsScene);
+    if (dirtyItemResetPending)
+        return;
+    // dirtyItems.reserve(indexedItems.size() + unindexedItems.size());
+    dirtyItemResetPending = true;
+    QMetaObject::invokeMethod(q, "_q_resetDirtyItems", Qt::QueuedConnection);
+}
+
+/*!
+    \internal
+
+    Schedules an item for removal. This function leaves some stale indexes
+    around in the BSP tree; these will be cleaned up the next time someone
+    triggers purgeRemovedItems().
+
+    Note: This function is called from QGraphicsItem's destructor. \a item is
+    being destroyed, so we cannot call any pure virtual functions on it (such
+    as boundingRect()). Also, it is unnecessary to update the item's own state
+    in any way.
+
+    ### Refactoring: This function shares much functionality with removeItem()
+*/
+void QGraphicsScenePrivate::_q_removeItemLater(QGraphicsItem *item)
+{
+    Q_Q(QGraphicsScene);
+
+    if (QGraphicsItem *parent = item->d_func()->parent) {
+        QVariant variant;
+        qVariantSetValue<QGraphicsItem *>(variant, item);
+        parent->itemChange(QGraphicsItem::ItemChildRemovedChange, variant);
+        parent->d_func()->children.removeAll(item);
+    }
+
+    // Clear focus on the item to remove any reference in the focusWidget
+    // chain.
+    item->clearFocus();
+
+    int index = item->d_func()->index;
+    if (index != -1) {
+        // Important: The index is useless until purgeRemovedItems() is
+        // called.
+        indexedItems[index] = (QGraphicsItem *)0;
+        if (!purgePending) {
+            purgePending = true;
+            q->update();
+        }
+        removedItems << item;
+    } else {
+        // Recently added items are purged immediately. unindexedItems() never
+        // contains stale items.
+        unindexedItems.removeAll(item);
+        q->update();
+    }
+
+    // Reset the mouse grabber and focus item data.
+    if (item == focusItem)
+        focusItem = 0;
+    if (item == lastFocusItem)
+        lastFocusItem = 0;
+    if (item == activeWindow) {
+        // ### deactivate...
+        activeWindow = 0;
+    }
+
+    // Disable selectionChanged() for individual items
+    ++selectionChanging;
+    int oldSelectedItemsSize = selectedItems.size();
+
+    // Update selected & hovered item bookkeeping
+    selectedItems.remove(item);
+    hoverItems.removeAll(item);
+    pendingUpdateItems.removeAll(item);
+    cachedItemsUnderMouse.removeAll(item);
+    unpolishedItems.removeAll(item);
+    dirtyItems.removeAll(item);
+
+    // Remove from scene transform cache
+    int transformIndex = item->d_func()->sceneTransformIndex;
+    if (transformIndex != -1) {
+        validTransforms.setBit(transformIndex, 0);
+        freeSceneTransformSlots.append(transformIndex);
+    }
+
+    // Remove all children recursively.
+    foreach (QGraphicsItem *child, item->children())
+        _q_removeItemLater(child);
+
+    // Reset the mouse grabber
+    if (mouseGrabberItems.contains(item))
+        ungrabMouse(item, /* item is dying */ true);
+
+    // Reset the keyboard grabber
+    if (keyboardGrabberItems.contains(item))
+        ungrabKeyboard(item, /* item is dying */ true);
+
+    // Reset the last mouse grabber item
+    if (item == lastMouseGrabberItem)
+        lastMouseGrabberItem = 0;
+
+    // Reenable selectionChanged() for individual items
+    --selectionChanging;
+    if (!selectionChanging && selectedItems.size() != oldSelectedItemsSize)
+        emit q->selectionChanged();
+}
+
+/*!
+    \internal
+
+    Removes stale pointers from all data structures.
+*/
+void QGraphicsScenePrivate::purgeRemovedItems()
+{
+    Q_Q(QGraphicsScene);
+
+    if (!purgePending && removedItems.isEmpty())
+        return;
+
+    // Remove stale items from the BSP tree.
+    if (indexMethod != QGraphicsScene::NoIndex)
+        bspTree.removeItems(removedItems);
+
+    // Purge this list.
+    removedItems.clear();
+    freeItemIndexes.clear();
+    for (int i = 0; i < indexedItems.size(); ++i) {
+        if (!indexedItems.at(i))
+            freeItemIndexes << i;
+    }
+    purgePending = false;
+
+    // No locality info for the items; update the whole scene.
+    q->update();
+}
+
+/*!
+    \internal
+
+    Starts or restarts the timer used for reindexing unindexed items.
+*/
+void QGraphicsScenePrivate::startIndexTimer()
+{
+    Q_Q(QGraphicsScene);
+    if (indexTimerId) {
+        restartIndexTimer = true;
+    } else {
+        indexTimerId = q->startTimer(QGRAPHICSSCENE_INDEXTIMER_TIMEOUT);
+    }
+}
+
+/*!
+    \internal
+*/
+void QGraphicsScenePrivate::addPopup(QGraphicsWidget *widget)
+{
+    Q_ASSERT(widget);
+    Q_ASSERT(!popupWidgets.contains(widget));
+    popupWidgets << widget;
+    if (QGraphicsWidget *focusWidget = widget->focusWidget()) {
+        focusWidget->setFocus(Qt::PopupFocusReason);
+    } else {
+        grabKeyboard((QGraphicsItem *)widget);
+        if (focusItem && popupWidgets.size() == 1) {
+            QFocusEvent event(QEvent::FocusOut, Qt::PopupFocusReason);
+            sendEvent(focusItem, &event);
+        }
+    }
+    grabMouse((QGraphicsItem *)widget);
+}
+
+/*!
+    \internal
+
+    Remove \a widget from the popup list. Important notes:
+
+    \a widget is guaranteed to be in the list of popups, but it might not be
+    the last entry; you can hide any item in the pop list before the others,
+    and this must cause all later mouse grabbers to lose the grab.
+*/
+void QGraphicsScenePrivate::removePopup(QGraphicsWidget *widget, bool itemIsDying)
+{
+    Q_ASSERT(widget);
+    int index = popupWidgets.indexOf(widget);
+    Q_ASSERT(index != -1);
+
+    for (int i = popupWidgets.size() - 1; i >= index; --i) {
+        QGraphicsWidget *widget = popupWidgets.takeLast();
+        ungrabMouse(widget, itemIsDying);
+        if (focusItem && popupWidgets.isEmpty()) {
+            QFocusEvent event(QEvent::FocusIn, Qt::PopupFocusReason);
+            sendEvent(focusItem, &event);
+        } else {
+            ungrabKeyboard((QGraphicsItem *)widget, itemIsDying);
+        }
+        if (!itemIsDying && widget->isVisible()) {
+            widget->hide();
+            widget->QGraphicsItem::d_ptr->explicitlyHidden = 0;
+        }
+    }
+}
+
+/*!
+    \internal
+*/
+void QGraphicsScenePrivate::grabMouse(QGraphicsItem *item, bool implicit)
+{
+    // Append to list of mouse grabber items, and send a mouse grab event.
+    if (mouseGrabberItems.contains(item)) {
+        if (mouseGrabberItems.last() == item)
+            qWarning("QGraphicsItem::grabMouse: already a mouse grabber");
+        else
+            qWarning("QGraphicsItem::grabMouse: already blocked by mouse grabber: %p",
+                     mouseGrabberItems.last());
+        return;
+    }
+
+    // Send ungrab event to the last grabber.
+    if (!mouseGrabberItems.isEmpty()) {
+        QGraphicsItem *last = mouseGrabberItems.last();
+        if (lastMouseGrabberItemHasImplicitMouseGrab) {
+            // Implicit mouse grab is immediately lost.
+            last->ungrabMouse();
+        } else {
+            // Just send ungrab event to current grabber.
+            QEvent ungrabEvent(QEvent::UngrabMouse);
+            sendEvent(last, &ungrabEvent);
+        }
+    }
+
+    mouseGrabberItems << item;
+    lastMouseGrabberItemHasImplicitMouseGrab = implicit;
+
+    // Send grab event to current grabber.
+    QEvent grabEvent(QEvent::GrabMouse);
+    sendEvent(item, &grabEvent);
+}
+
+/*!
+    \internal
+*/
+void QGraphicsScenePrivate::ungrabMouse(QGraphicsItem *item, bool itemIsDying)
+{
+    int index = mouseGrabberItems.indexOf(item);
+    if (index == -1) {
+        qWarning("QGraphicsItem::ungrabMouse: not a mouse grabber");
+        return;
+    }
+
+    if (item != mouseGrabberItems.last()) {
+        // Recursively ungrab the next mouse grabber until we reach this item
+        // to ensure state consistency.
+        ungrabMouse(mouseGrabberItems.at(index + 1), itemIsDying);
+    }
+    if (!popupWidgets.isEmpty() && item == popupWidgets.last()) {
+        // If the item is a popup, go via removePopup to ensure state
+        // consistency and that it gets hidden correctly - beware that
+        // removePopup() reenters this function to continue removing the grab.
+        removePopup((QGraphicsWidget *)item, itemIsDying);
+        return;
+    }
+
+    // Send notification about mouse ungrab.
+    if (!itemIsDying) {
+        QEvent event(QEvent::UngrabMouse);
+        sendEvent(item, &event);
+    }
+
+    // Remove the item from the list of grabbers. Whenever this happens, we
+    // reset the implicitGrab (there can be only ever be one implicit grabber
+    // in a scene, and it is always the latest grabber; if the implicit grab
+    // is lost, it is not automatically regained.
+    mouseGrabberItems.takeLast();
+    lastMouseGrabberItemHasImplicitMouseGrab = false;
+
+    // Send notification about mouse regrab. ### It's unfortunate that all the
+    // items get a GrabMouse event, but this is a rare case with a simple
+    // implementation and it does ensure a consistent state.
+    if (!itemIsDying && !mouseGrabberItems.isEmpty()) {
+        QGraphicsItem *last = mouseGrabberItems.last();
+        QEvent event(QEvent::GrabMouse);
+        sendEvent(last, &event);
+    }
+}
+
+/*!
+    \internal
+*/
+void QGraphicsScenePrivate::clearMouseGrabber()
+{
+    if (!mouseGrabberItems.isEmpty())
+        mouseGrabberItems.first()->ungrabMouse();
+    lastMouseGrabberItem = 0;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsScenePrivate::grabKeyboard(QGraphicsItem *item)
+{
+    if (keyboardGrabberItems.contains(item)) {
+        if (keyboardGrabberItems.last() == item)
+            qWarning("QGraphicsItem::grabKeyboard: already a keyboard grabber");
+        else
+            qWarning("QGraphicsItem::grabKeyboard: already blocked by keyboard grabber: %p",
+                     keyboardGrabberItems.last());
+        return;
+    }
+
+    // Send ungrab event to the last grabber.
+    if (!keyboardGrabberItems.isEmpty()) {
+        // Just send ungrab event to current grabber.
+        QEvent ungrabEvent(QEvent::UngrabKeyboard);
+        sendEvent(keyboardGrabberItems.last(), &ungrabEvent);
+    }
+
+    keyboardGrabberItems << item;
+
+    // Send grab event to current grabber.
+    QEvent grabEvent(QEvent::GrabKeyboard);
+    sendEvent(item, &grabEvent);
+}
+
+/*!
+    \internal
+*/
+void QGraphicsScenePrivate::ungrabKeyboard(QGraphicsItem *item, bool itemIsDying)
+{
+    int index = keyboardGrabberItems.lastIndexOf(item);
+    if (index == -1) {
+        qWarning("QGraphicsItem::ungrabKeyboard: not a keyboard grabber");
+        return;
+    }
+    if (item != keyboardGrabberItems.last()) {
+        // Recursively ungrab the topmost keyboard grabber until we reach this
+        // item to ensure state consistency.
+        ungrabKeyboard(keyboardGrabberItems.at(index + 1), itemIsDying);
+    }
+
+    // Send notification about keyboard ungrab.
+    if (!itemIsDying) {
+        QEvent event(QEvent::UngrabKeyboard);
+        sendEvent(item, &event);
+    }
+
+    // Remove the item from the list of grabbers.
+    keyboardGrabberItems.takeLast();
+
+    // Send notification about mouse regrab.
+    if (!itemIsDying && !keyboardGrabberItems.isEmpty()) {
+        QGraphicsItem *last = keyboardGrabberItems.last();
+        QEvent event(QEvent::GrabKeyboard);
+        sendEvent(last, &event);
+    }
+}
+
+/*!
+    \internal
+*/
+void QGraphicsScenePrivate::clearKeyboardGrabber()
+{
+    if (!keyboardGrabberItems.isEmpty())
+        ungrabKeyboard(keyboardGrabberItems.first());
+}
+
+/*!
+    Returns all items for the screen position in \a event.
+*/
+QList<QGraphicsItem *> QGraphicsScenePrivate::itemsAtPosition(const QPoint &screenPos,
+                                                              const QPointF &scenePos,
+                                                              QWidget *widget) const
+{
+    Q_Q(const QGraphicsScene);
+    QGraphicsView *view = widget ? qobject_cast<QGraphicsView *>(widget->parentWidget()) : 0;
+    QList<QGraphicsItem *> items;
+    if (view)
+        items = view->items(view->viewport()->mapFromGlobal(screenPos));
+    else
+        items = q->items(scenePos);
+    return items;
+}
+
+/*!
+    \internal
+
+    Checks if item collides with the path and mode, but also checks that if it
+    doesn't collide, maybe its frame rect will.
+*/
+bool QGraphicsScenePrivate::itemCollidesWithPath(QGraphicsItem *item,
+                                                 const QPainterPath &path,
+                                                 Qt::ItemSelectionMode mode)
+{
+    if (item->collidesWithPath(path, mode))
+        return true;
+    if (item->isWidget()) {
+        // Check if this is a window, and if its frame rect collides.
+        QGraphicsWidget *widget = static_cast<QGraphicsWidget *>(item);
+        if (widget->isWindow()) {
+            QRectF frameRect = widget->windowFrameRect();
+            QPainterPath framePath;
+            framePath.addRect(frameRect);
+            bool intersects = path.intersects(frameRect);
+            if (mode == Qt::IntersectsItemShape || mode == Qt::IntersectsItemBoundingRect)
+                return intersects || path.contains(frameRect.topLeft())
+                    || framePath.contains(path.elementAt(0));
+            return !intersects && path.contains(frameRect.topLeft());
+        }
+    }
+    return false;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsScenePrivate::storeMouseButtonsForMouseGrabber(QGraphicsSceneMouseEvent *event)
+{
+    for (int i = 0x1; i <= 0x10; i <<= 1) {
+        if (event->buttons() & i) {
+            mouseGrabberButtonDownPos.insert(Qt::MouseButton(i),
+                                             mouseGrabberItems.last()->d_ptr->genericMapFromScene(event->scenePos(),
+                                                                                          event->widget()));
+            mouseGrabberButtonDownScenePos.insert(Qt::MouseButton(i), event->scenePos());
+            mouseGrabberButtonDownScreenPos.insert(Qt::MouseButton(i), event->screenPos());
+        }
+    }
+}
+
+/*!
+    \internal
+*/
+void QGraphicsScenePrivate::installSceneEventFilter(QGraphicsItem *watched, QGraphicsItem *filter)
+{
+    sceneEventFilters.insert(watched, filter);
+}
+
+/*!
+    \internal
+*/
+void QGraphicsScenePrivate::removeSceneEventFilter(QGraphicsItem *watched, QGraphicsItem *filter)
+{
+    if (!sceneEventFilters.contains(watched))
+        return;
+
+    QMultiMap<QGraphicsItem *, QGraphicsItem *>::Iterator it = sceneEventFilters.lowerBound(watched);
+    QMultiMap<QGraphicsItem *, QGraphicsItem *>::Iterator end = sceneEventFilters.upperBound(watched);
+    do {
+        if (it.value() == filter)
+            it = sceneEventFilters.erase(it);
+        else
+            ++it;
+    } while (it != end);
+}
+
+/*!
+    \internal
+*/
+bool QGraphicsScenePrivate::filterEvent(QGraphicsItem *item, QEvent *event)
+{
+    if (item && !sceneEventFilters.contains(item))
+        return false;
+
+    QMultiMap<QGraphicsItem *, QGraphicsItem *>::Iterator it = sceneEventFilters.lowerBound(item);
+    QMultiMap<QGraphicsItem *, QGraphicsItem *>::Iterator end = sceneEventFilters.upperBound(item);
+    while (it != end) {
+        // ### The filterer and filteree might both be deleted.
+        if (it.value()->sceneEventFilter(it.key(), event))
+            return true;
+        ++it;
+    }
+    return false;
+}
+
+/*!
+    \internal
+
+    This is the final dispatch point for any events from the scene to the
+    item. It filters the event first - if the filter returns true, the event
+    is considered to have been eaten by the filter, and is therefore stopped
+    (the default filter returns false). Then/otherwise, if the item is
+    enabled, the event is sent; otherwise it is stopped.
+*/
+bool QGraphicsScenePrivate::sendEvent(QGraphicsItem *item, QEvent *event)
+{
+    if (filterEvent(item, event))
+        return false;
+    return (item && item->isEnabled()) ? item->sceneEvent(event) : false;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsScenePrivate::cloneDragDropEvent(QGraphicsSceneDragDropEvent *dest,
+                                               QGraphicsSceneDragDropEvent *source)
+{
+    dest->setWidget(source->widget());
+    dest->setPos(source->pos());
+    dest->setScenePos(source->scenePos());
+    dest->setScreenPos(source->screenPos());
+    dest->setButtons(source->buttons());
+    dest->setModifiers(source->modifiers());
+    dest->setPossibleActions(source->possibleActions());
+    dest->setProposedAction(source->proposedAction());
+    dest->setDropAction(source->dropAction());
+    dest->setSource(source->source());
+    dest->setMimeData(source->mimeData());
+}
+
+/*!
+    \internal
+*/
+void QGraphicsScenePrivate::sendDragDropEvent(QGraphicsItem *item,
+                                              QGraphicsSceneDragDropEvent *dragDropEvent)
+{
+    dragDropEvent->setPos(item->d_ptr->genericMapFromScene(dragDropEvent->scenePos(), dragDropEvent->widget()));
+    sendEvent(item, dragDropEvent);
+}
+
+/*!
+    \internal
+*/
+void QGraphicsScenePrivate::sendHoverEvent(QEvent::Type type, QGraphicsItem *item,
+                                           QGraphicsSceneHoverEvent *hoverEvent)
+{
+    QGraphicsSceneHoverEvent event(type);
+    event.setWidget(hoverEvent->widget());
+    event.setPos(item->d_ptr->genericMapFromScene(hoverEvent->scenePos(), hoverEvent->widget()));
+    event.setScenePos(hoverEvent->scenePos());
+    event.setScreenPos(hoverEvent->screenPos());
+    event.setLastPos(item->d_ptr->genericMapFromScene(hoverEvent->lastScenePos(), hoverEvent->widget()));
+    event.setLastScenePos(hoverEvent->lastScenePos());
+    event.setLastScreenPos(hoverEvent->lastScreenPos());
+    event.setModifiers(hoverEvent->modifiers());
+    sendEvent(item, &event);
+}
+
+/*!
+    \internal
+*/
+void QGraphicsScenePrivate::sendMouseEvent(QGraphicsSceneMouseEvent *mouseEvent)
+{
+    if (mouseEvent->button() == 0 && mouseEvent->buttons() == 0 && lastMouseGrabberItemHasImplicitMouseGrab) {
+        // ### This is a temporary fix for until we get proper mouse
+        // grab events.
+        clearMouseGrabber();
+        return;
+    }
+
+    QGraphicsItem *item = mouseGrabberItems.last();
+    for (int i = 0x1; i <= 0x10; i <<= 1) {
+        Qt::MouseButton button = Qt::MouseButton(i);
+        mouseEvent->setButtonDownPos(button, mouseGrabberButtonDownPos.value(button, item->d_ptr->genericMapFromScene(mouseEvent->scenePos(), mouseEvent->widget())));
+        mouseEvent->setButtonDownScenePos(button, mouseGrabberButtonDownScenePos.value(button, mouseEvent->scenePos()));
+        mouseEvent->setButtonDownScreenPos(button, mouseGrabberButtonDownScreenPos.value(button, mouseEvent->screenPos()));
+    }
+    mouseEvent->setPos(item->d_ptr->genericMapFromScene(mouseEvent->scenePos(), mouseEvent->widget()));
+    mouseEvent->setLastPos(item->d_ptr->genericMapFromScene(mouseEvent->lastScenePos(), mouseEvent->widget()));
+    sendEvent(item, mouseEvent);
+}
+
+/*!
+    \internal
+*/
+void QGraphicsScenePrivate::mousePressEventHandler(QGraphicsSceneMouseEvent *mouseEvent)
+{
+    Q_Q(QGraphicsScene);
+
+    // Ignore by default, unless we find a mouse grabber that accepts it.
+    mouseEvent->ignore();
+
+    // Deliver to any existing mouse grabber.
+    if (!mouseGrabberItems.isEmpty()) {
+        // The event is ignored by default, but we disregard the event's
+        // accepted state after delivery; the mouse is grabbed, after all.
+        sendMouseEvent(mouseEvent);
+        return;
+    }
+
+    // Start by determining the number of items at the current position.
+    // Reuse value from earlier calculations if possible.
+    if (cachedItemsUnderMouse.isEmpty()) {
+        cachedItemsUnderMouse = itemsAtPosition(mouseEvent->screenPos(),
+                                                mouseEvent->scenePos(),
+                                                mouseEvent->widget());
+    }
+
+    // Update window activation.
+    QGraphicsWidget *newActiveWindow = windowForItem(cachedItemsUnderMouse.value(0));
+    if (newActiveWindow != activeWindow)
+        q->setActiveWindow(newActiveWindow);
+
+    // Set focus on the topmost enabled item that can take focus.
+    bool setFocus = false;
+    foreach (QGraphicsItem *item, cachedItemsUnderMouse) {
+        if (item->isEnabled() && (item->flags() & QGraphicsItem::ItemIsFocusable)) {
+            if (!item->isWidget() || ((QGraphicsWidget *)item)->focusPolicy() & Qt::ClickFocus) {
+                setFocus = true;
+                if (item != q->focusItem())
+                    q->setFocusItem(item, Qt::MouseFocusReason);
+                break;
+            }
+        }
+    }
+
+    // If nobody could take focus, clear it.
+    if (!stickyFocus && !setFocus)
+        q->setFocusItem(0, Qt::MouseFocusReason);
+
+    // Find a mouse grabber by sending mouse press events to all mouse grabber
+    // candidates one at a time, until the event is accepted. It's accepted by
+    // default, so the receiver has to explicitly ignore it for it to pass
+    // through.
+    foreach (QGraphicsItem *item, cachedItemsUnderMouse) {
+        if (!(item->acceptedMouseButtons() & mouseEvent->button())) {
+            // Skip items that don't accept the event's mouse button.
+            continue;
+        }
+
+        grabMouse(item, /* implicit = */ true);
+        mouseEvent->accept();
+
+        // check if the item we are sending to are disabled (before we send the event)
+        bool disabled = !item->isEnabled();
+        bool isWindow = item->isWindow();
+        if (mouseEvent->type() == QEvent::GraphicsSceneMouseDoubleClick && item != lastMouseGrabberItem) {
+            // If this item is different from the item that received the last
+            // mouse event, and mouseEvent is a doubleclick event, then the
+            // event is converted to a press. Known limitation:
+            // Triple-clicking will not generate a doubleclick, though.
+            QGraphicsSceneMouseEvent mousePress(QEvent::GraphicsSceneMousePress);
+            mousePress.accept();
+            mousePress.setButton(mouseEvent->button());
+            mousePress.setButtons(mouseEvent->buttons());
+            mousePress.setScreenPos(mouseEvent->screenPos());
+            mousePress.setScenePos(mouseEvent->scenePos());
+            mousePress.setModifiers(mouseEvent->modifiers());
+            mousePress.setWidget(mouseEvent->widget());
+            mousePress.setButtonDownPos(mouseEvent->button(),
+                                        mouseEvent->buttonDownPos(mouseEvent->button()));
+            mousePress.setButtonDownScenePos(mouseEvent->button(),
+                                             mouseEvent->buttonDownScenePos(mouseEvent->button()));
+            mousePress.setButtonDownScreenPos(mouseEvent->button(),
+                                              mouseEvent->buttonDownScreenPos(mouseEvent->button()));
+            sendMouseEvent(&mousePress);
+            mouseEvent->setAccepted(mousePress.isAccepted());
+        } else {
+            sendMouseEvent(mouseEvent);
+        }
+
+        bool dontSendUngrabEvents = mouseGrabberItems.isEmpty() || mouseGrabberItems.last() != item;
+        if (disabled) {
+            ungrabMouse(item, /* itemIsDying = */ dontSendUngrabEvents);
+            break;
+        }
+        if (mouseEvent->isAccepted()) {
+            if (!mouseGrabberItems.isEmpty())
+                storeMouseButtonsForMouseGrabber(mouseEvent);
+            lastMouseGrabberItem = item;
+            return;
+        }
+        ungrabMouse(item, /* itemIsDying = */ dontSendUngrabEvents);
+
+        // Don't propagate through windows.
+        if (isWindow)
+            break;
+    }
+
+    // Is the event still ignored? Then the mouse press goes to the scene.
+    // Reset the mouse grabber, clear the selection, clear focus, and leave
+    // the event ignored so that it can propagate through the originating
+    // view.
+    if (!mouseEvent->isAccepted()) {
+        clearMouseGrabber();
+
+        QGraphicsView *view = mouseEvent->widget() ? qobject_cast<QGraphicsView *>(mouseEvent->widget()->parentWidget()) : 0;
+        bool dontClearSelection = view && view->dragMode() == QGraphicsView::ScrollHandDrag;
+        if (!dontClearSelection) {
+            // Clear the selection if the originating view isn't in scroll
+            // hand drag mode. The view will clear the selection if no drag
+            // happened.
+            q->clearSelection();
+        }
+    }
+}
+
+QGraphicsWidget *QGraphicsScenePrivate::windowForItem(const QGraphicsItem *item) const
+{
+    if (!item)
+        return 0;
+    do {
+        if (item->isWidget())
+            return static_cast<const QGraphicsWidget *>(item)->window();
+        item = item->parentItem();
+    } while (item);
+    return 0;
+}
+
+QList<QGraphicsItem *> QGraphicsScenePrivate::items_helper(const QRectF &rect,
+                                                           Qt::ItemSelectionMode mode,
+                                                           Qt::SortOrder order) const
+{
+    QList<QGraphicsItem *> items;
+
+    QPainterPath path;
+
+    // The index returns a rough estimate of what items are inside the rect.
+    // Refine it by iterating through all returned items.
+    QRectF adjustedRect = _q_adjustedRect(rect);
+    foreach (QGraphicsItem *item, estimateItemsInRect(adjustedRect)) {
+        // Find the item's scene transform in a clever way.
+        QTransform x = item->sceneTransform();
+        bool keep = false;
+
+        // ### _q_adjustedRect is only needed because QRectF::intersects,
+        // QRectF::contains and QTransform::map() and friends don't work with
+        // flat rectangles.
+        QRectF br = _q_adjustedRect(item->boundingRect());
+        if (mode >= Qt::ContainsItemBoundingRect) {
+            // Rect intersects/contains item's bounding rect
+            QRectF mbr = x.mapRect(br);
+            if ((mode == Qt::IntersectsItemBoundingRect && QRectF_intersects(rect, mbr))
+                || (mode == Qt::ContainsItemBoundingRect && rect != mbr && rect.contains(mbr))) {
+                items << item;
+                keep = true;
+            }
+        } else {
+            // Rect intersects/contains item's shape
+            if (QRectF_intersects(adjustedRect, x.mapRect(br))) {
+                bool ok;
+                QTransform xinv = x.inverted(&ok);
+                if (ok) {
+                    if (path == QPainterPath())
+                        path.addRect(rect);
+                    if (itemCollidesWithPath(item, xinv.map(path), mode)) {
+                        items << item;
+                        keep = true;
+                    }
+                }
+            }
+        }
+
+        if (keep && (item->flags() & QGraphicsItem::ItemClipsChildrenToShape)) {
+            // Recurse into children that clip children.
+            bool ok;
+            QTransform xinv = x.inverted(&ok);
+            if (ok) {
+                if (x.type() <= QTransform::TxScale) {
+                    // Rect
+                    childItems_helper(&items, item, xinv.mapRect(rect), mode);
+                } else {
+                    // Polygon
+                    childItems_helper(&items, item, xinv.map(rect), mode);
+                }
+            }
+        }
+    }
+
+    if (order != Qt::SortOrder(-1))
+        sortItems(&items, order, sortCacheEnabled);
+    return items;
+}
+
+QList<QGraphicsItem *> QGraphicsScenePrivate::items_helper(const QPolygonF &polygon,
+                                                           Qt::ItemSelectionMode mode,
+                                                           Qt::SortOrder order) const
+{
+    QList<QGraphicsItem *> items;
+
+    QRectF polyRect = _q_adjustedRect(polygon.boundingRect());
+    QPainterPath path;
+
+    // The index returns a rough estimate of what items are inside the rect.
+    // Refine it by iterating through all returned items.
+    foreach (QGraphicsItem *item, estimateItemsInRect(polyRect)) {
+        // Find the item's scene transform in a clever way.
+        QTransform x = item->sceneTransform();
+        bool keep = false;
+
+        // ### _q_adjustedRect is only needed because QRectF::intersects,
+        // QRectF::contains and QTransform::map() and friends don't work with
+        // flat rectangles.
+        QRectF br = _q_adjustedRect(item->boundingRect());
+        if (mode >= Qt::ContainsItemBoundingRect) {
+            // Polygon contains/intersects item's bounding rect
+            if (path == QPainterPath())
+                path.addPolygon(polygon);
+            if ((mode == Qt::IntersectsItemBoundingRect && path.intersects(x.mapRect(br)))
+                || (mode == Qt::ContainsItemBoundingRect && path.contains(x.mapRect(br)))) {
+                items << item;
+                keep = true;
+            }
+        } else {
+            // Polygon contains/intersects item's shape
+            if (QRectF_intersects(polyRect, x.mapRect(br))) {
+                bool ok;
+                QTransform xinv = x.inverted(&ok);
+                if (ok) {
+                    if (path == QPainterPath())
+                        path.addPolygon(polygon);
+                    if (itemCollidesWithPath(item, xinv.map(path), mode)) {
+                        items << item;
+                        keep = true;
+                    }
+                }
+            }
+        }
+
+        if (keep && (item->flags() & QGraphicsItem::ItemClipsChildrenToShape)) {
+            // Recurse into children that clip children.
+            bool ok;
+            QTransform xinv = x.inverted(&ok);
+            if (ok)
+                childItems_helper(&items, item, xinv.map(polygon), mode);
+        }
+    }
+
+    if (order != Qt::SortOrder(-1))
+        sortItems(&items, order, sortCacheEnabled);
+    return items;
+}
+
+QList<QGraphicsItem *> QGraphicsScenePrivate::items_helper(const QPainterPath &path,
+                                                           Qt::ItemSelectionMode mode,
+                                                           Qt::SortOrder order) const
+{
+    QList<QGraphicsItem *> items;
+    // The index returns a rough estimate of what items are inside the rect.
+    // Refine it by iterating through all returned items.
+    foreach (QGraphicsItem *item, estimateItemsInRect(_q_adjustedRect(path.controlPointRect()))) {
+        // Find the item's scene transform in a clever way.
+        QTransform x = item->sceneTransform();
+        bool ok;
+        QTransform xinv = x.inverted(&ok);
+        if (ok) {
+            QPainterPath mappedPath = xinv.map(path);
+            if (itemCollidesWithPath(item, mappedPath, mode)) {
+                items << item;
+                if (item->flags() & QGraphicsItem::ItemClipsChildrenToShape)
+                    childItems_helper(&items, item, mappedPath, mode);
+            }
+        }
+    }
+
+    if (order != Qt::SortOrder(-1))
+        sortItems(&items, order, sortCacheEnabled);
+    return items;
+}
+
+void QGraphicsScenePrivate::childItems_helper(QList<QGraphicsItem *> *items,
+                                              const QGraphicsItem *parent,
+                                              const QRectF &rect,
+                                              Qt::ItemSelectionMode mode) const
+{
+    QPainterPath path;
+    bool parentClip = (parent->flags() & QGraphicsItem::ItemClipsChildrenToShape);
+    QRectF r = !parentClip ? _q_adjustedRect(rect) : _q_adjustedRect(rect).intersected(_q_adjustedRect(parent->boundingRect()));
+    if (r.isEmpty())
+        return;
+
+    QList<QGraphicsItem *> &children = parent->d_ptr->children;
+    for (int i = 0; i < children.size(); ++i) {
+        QGraphicsItem *item = children.at(i);
+        if (item->d_ptr->hasTransform && !item->transform().isInvertible())
+            continue;
+
+        // Skip invisible items and all their children.
+        if (!item->d_ptr->visible || qFuzzyCompare(item->effectiveOpacity(), qreal(0.0)))
+            continue;
+
+        // ### _q_adjustedRect is only needed because QRectF::intersects,
+        // QRectF::contains and QTransform::map() and friends don't work with
+        // flat rectangles.
+        QRectF br = _q_adjustedRect(item->boundingRect());
+        QRectF mbr = item->mapRectToParent(br);
+        bool keep = false;
+        if (mode >= Qt::ContainsItemBoundingRect) {
+            // Rect intersects/contains item's bounding rect
+            if ((mode == Qt::IntersectsItemBoundingRect && QRectF_intersects(rect, mbr))
+                || (mode == Qt::ContainsItemBoundingRect && rect != mbr && rect.contains(br))) {
+                items->append(item);
+                keep = true;
+            }
+        } else {
+            // Rect intersects/contains item's shape
+            if (QRectF_intersects(rect, mbr)) {
+                if (path == QPainterPath())
+                    path.addRect(rect);
+                if (itemCollidesWithPath(item, item->mapFromParent(path), mode)) {
+                    items->append(item);
+                    keep = true;
+                }
+            }
+        }
+
+        if ((keep || !(item->flags() & QGraphicsItem::ItemClipsChildrenToShape)) && !item->d_ptr->children.isEmpty()) {
+            // Recurse into children.
+            if (!item->d_ptr->hasTransform || item->transform().type() <= QTransform::TxScale) {
+                // Rect
+                childItems_helper(items, item, item->mapRectFromParent(rect), mode);
+            } else {
+                // Polygon
+                childItems_helper(items, item, item->mapFromParent(rect), mode);
+            }
+        }
+    }
+}
+
+void QGraphicsScenePrivate::childItems_helper(QList<QGraphicsItem *> *items,
+                                              const QGraphicsItem *parent,
+                                              const QPolygonF &polygon,
+                                              Qt::ItemSelectionMode mode) const
+{
+    QPainterPath path;
+    bool parentClip = (parent->flags() & QGraphicsItem::ItemClipsChildrenToShape);
+    QRectF polyRect = _q_adjustedRect(polygon.boundingRect());
+    QRectF r = !parentClip ? polyRect : polyRect.intersected(_q_adjustedRect(parent->boundingRect()));
+    if (r.isEmpty())
+        return;
+
+    QList<QGraphicsItem *> &children = parent->d_ptr->children;
+    for (int i = 0; i < children.size(); ++i) {
+        QGraphicsItem *item = children.at(i);
+        if (item->d_ptr->hasTransform && !item->transform().isInvertible())
+            continue;
+
+        // Skip invisible items.
+        if (!item->d_ptr->visible || qFuzzyCompare(item->effectiveOpacity() + 1, qreal(1.0)))
+            continue;
+
+        // ### _q_adjustedRect is only needed because QRectF::intersects,
+        // QRectF::contains and QTransform::map() and friends don't work with
+        // flat rectangles.
+        QRectF br = _q_adjustedRect(item->boundingRect());
+        bool keep = false;
+        if (mode >= Qt::ContainsItemBoundingRect) {
+            // Polygon contains/intersects item's bounding rect
+            if (path == QPainterPath())
+                path.addPolygon(polygon);
+            if ((mode == Qt::IntersectsItemBoundingRect && path.intersects(item->mapRectToParent(br)))
+                || (mode == Qt::ContainsItemBoundingRect && path.contains(item->mapRectToParent(br)))) {
+                items->append(item);
+                keep = true;
+            }
+        } else {
+            // Polygon contains/intersects item's shape
+            if (QRectF_intersects(polyRect, item->mapRectToParent(br))) {
+                if (path == QPainterPath())
+                    path.addPolygon(polygon);
+                if (itemCollidesWithPath(item, item->mapFromParent(path), mode)) {
+                    items->append(item);
+                    keep = true;
+                }
+            }
+        }
+
+        if ((keep || !(item->flags() & QGraphicsItem::ItemClipsChildrenToShape)) && !item->d_ptr->children.isEmpty()) {
+            // Recurse into children that clip children.
+            childItems_helper(items, item, item->mapFromParent(polygon), mode);
+        }
+    }
+}
+
+void QGraphicsScenePrivate::childItems_helper(QList<QGraphicsItem *> *items,
+                                              const QGraphicsItem *parent,
+                                              const QPainterPath &path,
+                                              Qt::ItemSelectionMode mode) const
+{
+    bool parentClip = (parent->flags() & QGraphicsItem::ItemClipsChildrenToShape);
+    QPainterPath intersectedPath = !parentClip ? path : path.intersected(parent->shape());
+    if (intersectedPath.isEmpty())
+        return;
+
+    QList<QGraphicsItem *> &children = parent->d_ptr->children;
+    for (int i = 0; i < children.size(); ++i) {
+        QGraphicsItem *item = children.at(i);
+
+        // Skip invisible items.
+        if (!item->d_ptr->visible || qFuzzyCompare(item->effectiveOpacity(), qreal(0.0)))
+            continue;
+
+        QTransform x = item->sceneTransform();
+
+        bool ok;
+        QTransform xinv = x.inverted(&ok);
+        if (ok) {
+            QPainterPath mappedPath = xinv.map(path);
+            if (itemCollidesWithPath(item, mappedPath, mode)) {
+                items->append(item);
+                if (!item->d_ptr->children.isEmpty())
+                    childItems_helper(items, item, mappedPath, mode);
+            }
+        }
+    }
+}
+
+void QGraphicsScenePrivate::invalidateSortCache()
+{
+    Q_Q(QGraphicsScene);
+    if (!sortCacheEnabled || updatingSortCache)
+        return;
+
+    updatingSortCache = true;
+    QMetaObject::invokeMethod(q, "_q_updateSortCache", Qt::QueuedConnection);
+}
+
+/*!
+    \internal
+
+    Should not be exported, but we can't change that now.
+    ### Qt 5: Remove symbol / make static
+*/
+inline bool qt_closestLeaf(const QGraphicsItem *item1, const QGraphicsItem *item2)
+{
+    // Return true if sibling item1 is on top of item2.
+    const QGraphicsItemPrivate *d1 = item1->d_ptr;
+    const QGraphicsItemPrivate *d2 = item2->d_ptr;
+    bool f1 = d1->flags & QGraphicsItem::ItemStacksBehindParent;
+    bool f2 = d2->flags & QGraphicsItem::ItemStacksBehindParent;
+    if (f1 != f2) return f2;
+    qreal z1 = d1->z;
+    qreal z2 = d2->z;
+    return z1 != z2 ? z1 > z2 : item1 > item2;
+}
+
+/*!
+    \internal
+
+    Should not be exported, but we can't change that now.
+*/
+inline bool qt_closestItemFirst(const QGraphicsItem *item1, const QGraphicsItem *item2)
+{
+    return QGraphicsScenePrivate::closestItemFirst_withoutCache(item1, item2);
+}
+
+/*!
+    Returns true if \a item1 is on top of \a item2.
+
+    \internal
+*/
+bool QGraphicsScenePrivate::closestItemFirst_withoutCache(const QGraphicsItem *item1, const QGraphicsItem *item2)
+{
+    // Siblings? Just check their z-values.
+    const QGraphicsItemPrivate *d1 = item1->d_ptr;
+    const QGraphicsItemPrivate *d2 = item2->d_ptr;
+    if (d1->parent == d2->parent)
+        return qt_closestLeaf(item1, item2);
+
+    // Find common ancestor, and each item's ancestor closest to the common
+    // ancestor.
+    int item1Depth = d1->depth;
+    int item2Depth = d2->depth;
+    const QGraphicsItem *p = item1;
+    const QGraphicsItem *t1 = item1;
+    while (item1Depth > item2Depth && (p = p->d_ptr->parent)) {
+        if (p == item2) {
+            // item2 is one of item1's ancestors; item1 is on top
+            return !(t1->d_ptr->flags & QGraphicsItem::ItemStacksBehindParent);
+        }
+        t1 = p;
+        --item1Depth;
+    }
+    p = item2;
+    const QGraphicsItem *t2 = item2;
+    while (item2Depth > item1Depth && (p = p->d_ptr->parent)) {
+        if (p == item1) {
+            // item1 is one of item2's ancestors; item1 is not on top
+            return (t2->d_ptr->flags & QGraphicsItem::ItemStacksBehindParent);
+        }
+        t2 = p;
+        --item2Depth;
+    }
+
+    // item1Ancestor is now at the same level as item2Ancestor, but not the same.
+    const QGraphicsItem *a1 = t1;
+    const QGraphicsItem *a2 = t2;
+    while (a1) {
+        const QGraphicsItem *p1 = a1;
+        const QGraphicsItem *p2 = a2;
+        a1 = a1->parentItem();
+        a2 = a2->parentItem();
+        if (a1 && a1 == a2)
+            return qt_closestLeaf(p1, p2);
+    }
+
+    // No common ancestor? Then just compare the items' toplevels directly.
+    return qt_closestLeaf(t1->topLevelItem(), t2->topLevelItem());
+}
+
+/*!
+    Returns true if \a item2 is on top of \a item1.
+
+    \internal
+*/
+bool QGraphicsScenePrivate::closestItemLast_withoutCache(const QGraphicsItem *item1, const QGraphicsItem *item2)
+{
+    return closestItemFirst_withoutCache(item2, item1);
+}
+
+void QGraphicsScenePrivate::climbTree(QGraphicsItem *item, int *stackingOrder)
+{
+    if (!item->d_ptr->children.isEmpty()) {
+        QList<QGraphicsItem *> childList = item->d_ptr->children;
+        qSort(childList.begin(), childList.end(), qt_closestLeaf);
+        for (int i = 0; i < childList.size(); ++i) {
+            QGraphicsItem *item = childList.at(i);
+            if (!(item->flags() & QGraphicsItem::ItemStacksBehindParent))
+                climbTree(childList.at(i), stackingOrder);
+        }
+        item->d_ptr->globalStackingOrder = (*stackingOrder)++;
+        for (int i = 0; i < childList.size(); ++i) {
+            QGraphicsItem *item = childList.at(i);
+            if (item->flags() & QGraphicsItem::ItemStacksBehindParent)
+                climbTree(childList.at(i), stackingOrder);
+        }
+    } else {
+        item->d_ptr->globalStackingOrder = (*stackingOrder)++;
+    }
+}
+
+void QGraphicsScenePrivate::_q_updateSortCache()
+{
+    _q_updateIndex();
+
+    if (!sortCacheEnabled || !updatingSortCache)
+        return;
+
+    updatingSortCache = false;
+    int stackingOrder = 0;
+
+    QList<QGraphicsItem *> topLevels;
+
+    for (int i = 0; i < indexedItems.size(); ++i) {
+        QGraphicsItem *item = indexedItems.at(i);
+        if (item && item->parentItem() == 0)
+            topLevels << item;
+    }
+    for (int i = 0; i < unindexedItems.size(); ++i) {
+        QGraphicsItem *item = unindexedItems.at(i);
+        if (item->parentItem() == 0)
+            topLevels << item;
+    }
+
+    qSort(topLevels.begin(), topLevels.end(), qt_closestLeaf);
+    for (int i = 0; i < topLevels.size(); ++i)
+        climbTree(topLevels.at(i), &stackingOrder);
+}
+
+void QGraphicsScenePrivate::sortItems(QList<QGraphicsItem *> *itemList, Qt::SortOrder order,
+                                      bool sortCacheEnabled)
+{
+    if (sortCacheEnabled) {
+        if (order == Qt::AscendingOrder) {
+            qSort(itemList->begin(), itemList->end(), closestItemFirst_withCache);
+        } else if (order == Qt::DescendingOrder) {
+            qSort(itemList->begin(), itemList->end(), closestItemLast_withCache);
+        }
+    } else {
+        if (order == Qt::AscendingOrder) {
+            qSort(itemList->begin(), itemList->end(), closestItemFirst_withoutCache);
+        } else if (order == Qt::DescendingOrder) {
+            qSort(itemList->begin(), itemList->end(), closestItemLast_withoutCache);
+        }
+    }
+}
+
+/*!
+    \internal
+
+    Set the font and propagate the changes if the font is different from the
+    current font.
+*/
+void QGraphicsScenePrivate::setFont_helper(const QFont &font)
+{
+    if (this->font == font && this->font.resolve() == font.resolve())
+        return;
+    updateFont(font);
+}
+
+/*!
+    \internal
+
+    Resolve the scene's font against the application font, and propagate the
+    changes too all items in the scene.
+*/
+void QGraphicsScenePrivate::resolveFont()
+{
+    QFont naturalFont = qApp->font();
+    naturalFont.resolve(0);
+    QFont resolvedFont = font.resolve(naturalFont);
+    updateFont(resolvedFont);
+}
+
+/*!
+    \internal
+
+    Update the font, and whether or not it has changed, reresolve all fonts in
+    the scene.
+*/
+void QGraphicsScenePrivate::updateFont(const QFont &font)
+{
+    Q_Q(QGraphicsScene);
+
+    // Update local font setting.
+    this->font = font;
+
+    // Resolve the fonts of all top-level widget items, or widget items
+    // whose parent is not a widget.
+    foreach (QGraphicsItem *item, q->items()) {
+        if (!item->parentItem()) {
+            // Resolvefont for an item is a noop operation, but
+            // every item can be a widget, or can have a widget
+            // childre.
+            item->d_ptr->resolveFont(font.resolve());
+        }
+    }
+
+    // Send the scene a FontChange event.
+    QEvent event(QEvent::FontChange);
+    QApplication::sendEvent(q, &event);
+}
+
+/*!
+    \internal
+
+    Set the palette and propagate the changes if the palette is different from
+    the current palette.
+*/
+void QGraphicsScenePrivate::setPalette_helper(const QPalette &palette)
+{
+    if (this->palette == palette && this->palette.resolve() == palette.resolve())
+        return;
+    updatePalette(palette);
+}
+
+/*!
+    \internal
+
+    Resolve the scene's palette against the application palette, and propagate
+    the changes too all items in the scene.
+*/
+void QGraphicsScenePrivate::resolvePalette()
+{
+    QPalette naturalPalette = qApp->palette();
+    naturalPalette.resolve(0);
+    QPalette resolvedPalette = palette.resolve(naturalPalette);
+    updatePalette(resolvedPalette);
+}
+
+/*!
+    \internal
+
+    Update the palette, and whether or not it has changed, reresolve all
+    palettes in the scene.
+*/
+void QGraphicsScenePrivate::updatePalette(const QPalette &palette)
+{
+    Q_Q(QGraphicsScene);
+
+    // Update local palette setting.
+    this->palette = palette;
+
+    // Resolve the palettes of all top-level widget items, or widget items
+    // whose parent is not a widget.
+    foreach (QGraphicsItem *item, q->items()) {
+        if (!item->parentItem()) {
+            // Resolvefont for an item is a noop operation, but
+            // every item can be a widget, or can have a widget
+            // childre.
+            item->d_ptr->resolvePalette(palette.resolve());
+        }
+    }
+
+    // Send the scene a PaletteChange event.
+    QEvent event(QEvent::PaletteChange);
+    QApplication::sendEvent(q, &event);
+}
+
+/*!
+    Constructs a QGraphicsScene object. The \a parent parameter is
+    passed to QObject's constructor.
+*/
+QGraphicsScene::QGraphicsScene(QObject *parent)
+    : QObject(*new QGraphicsScenePrivate, parent)
+{
+    d_func()->init();
+}
+
+/*!
+    Constructs a QGraphicsScene object, using \a sceneRect for its
+    scene rectangle. The \a parent parameter is passed to QObject's
+    constructor.
+
+    \sa sceneRect
+*/
+QGraphicsScene::QGraphicsScene(const QRectF &sceneRect, QObject *parent)
+    : QObject(*new QGraphicsScenePrivate, parent)
+{
+    setSceneRect(sceneRect);
+    d_func()->init();
+}
+
+/*!
+    Constructs a QGraphicsScene object, using the rectangle specified
+    by (\a x, \a y), and the given \a width and \a height for its
+    scene rectangle. The \a parent parameter is passed to QObject's
+    constructor.
+
+    \sa sceneRect
+*/
+QGraphicsScene::QGraphicsScene(qreal x, qreal y, qreal width, qreal height, QObject *parent)
+    : QObject(*new QGraphicsScenePrivate, parent)
+{
+    setSceneRect(x, y, width, height);
+    d_func()->init();
+}
+
+/*!
+    Destroys the QGraphicsScene object.
+*/
+QGraphicsScene::~QGraphicsScene()
+{
+    Q_D(QGraphicsScene);
+    // Remove this scene from qApp's global scene list.
+    qApp->d_func()->scene_list.removeAll(this);
+
+    clear();
+
+    // Remove this scene from all associated views.
+    for (int j = 0; j < d->views.size(); ++j)
+        d->views.at(j)->setScene(0);
+}
+
+/*!
+    \property QGraphicsScene::sceneRect
+    \brief the scene rectangle; the bounding rectangle of the scene
+
+    The scene rectangle defines the extent of the scene. It is
+    primarily used by QGraphicsView to determine the view's default
+    scrollable area, and by QGraphicsScene to manage item indexing.
+
+    If unset, or if set to a null QRectF, sceneRect() will return the largest
+    bounding rect of all items on the scene since the scene was created (i.e.,
+    a rectangle that grows when items are added to or moved in the scene, but
+    never shrinks).
+
+    \sa width(), height(), QGraphicsView::sceneRect
+*/
+QRectF QGraphicsScene::sceneRect() const
+{
+    Q_D(const QGraphicsScene);
+    const_cast<QGraphicsScenePrivate *>(d)->_q_updateIndex();
+    return d->hasSceneRect ? d->sceneRect : d->growingItemsBoundingRect;
+}
+void QGraphicsScene::setSceneRect(const QRectF &rect)
+{
+    Q_D(QGraphicsScene);
+    if (rect != d->sceneRect) {
+        d->hasSceneRect = !rect.isNull();
+        d->sceneRect = rect;
+        d->resetIndex();
+        emit sceneRectChanged(rect);
+    }
+}
+
+/*!
+     \fn qreal QGraphicsScene::width() const
+
+     This convenience function is equivalent to calling sceneRect().width().
+
+     \sa height()
+*/
+
+/*!
+     \fn qreal QGraphicsScene::height() const
+
+     This convenience function is equivalent to calling \c sceneRect().height().
+
+     \sa width()
+*/
+
+/*!
+    Renders the \a source rect from scene into \a target, using \a painter. This
+    function is useful for capturing the contents of the scene onto a paint
+    device, such as a QImage (e.g., to take a screenshot), or for printing
+    with QPrinter. For example:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsscene.cpp 1
+
+    If \a source is a null rect, this function will use sceneRect() to
+    determine what to render. If \a target is a null rect, the dimensions of \a
+    painter's paint device will be used.
+
+    The source rect contents will be transformed according to \a
+    aspectRatioMode to fit into the target rect. By default, the aspect ratio
+    is kept, and \a source is scaled to fit in \a target.
+
+    \sa QGraphicsView::render()
+*/
+void QGraphicsScene::render(QPainter *painter, const QRectF &target, const QRectF &source,
+                            Qt::AspectRatioMode aspectRatioMode)
+{
+    Q_D(QGraphicsScene);
+
+    // Default source rect = scene rect
+    QRectF sourceRect = source;
+    if (sourceRect.isNull())
+        sourceRect = sceneRect();
+
+    // Default target rect = device rect
+    QRectF targetRect = target;
+    if (targetRect.isNull()) {
+        if (painter->device()->devType() == QInternal::Picture)
+            targetRect = sourceRect;
+        else
+            targetRect.setRect(0, 0, painter->device()->width(), painter->device()->height());
+    }
+
+    // Find the ideal x / y scaling ratio to fit \a source into \a target.
+    qreal xratio = targetRect.width() / sourceRect.width();
+    qreal yratio = targetRect.height() / sourceRect.height();
+
+    // Scale according to the aspect ratio mode.
+    switch (aspectRatioMode) {
+    case Qt::KeepAspectRatio:
+        xratio = yratio = qMin(xratio, yratio);
+        break;
+    case Qt::KeepAspectRatioByExpanding:
+        xratio = yratio = qMax(xratio, yratio);
+        break;
+    case Qt::IgnoreAspectRatio:
+        break;
+    }
+
+    // Find all items to draw, and reverse the list (we want to draw
+    // in reverse order).
+    QList<QGraphicsItem *> itemList = items(sourceRect, Qt::IntersectsItemBoundingRect);
+    QGraphicsItem **itemArray = new QGraphicsItem *[itemList.size()];
+    int numItems = itemList.size();
+    for (int i = 0; i < numItems; ++i)
+        itemArray[numItems - i - 1] = itemList.at(i);
+    itemList.clear();
+
+    painter->save();
+
+    // Transform the painter.
+    painter->setClipRect(targetRect);
+    QTransform painterTransform;
+    painterTransform *= QTransform()
+                        .translate(targetRect.left(), targetRect.top())
+                        .scale(xratio, yratio)
+                        .translate(-sourceRect.left(), -sourceRect.top());
+    painter->setWorldTransform(painterTransform, true);
+
+    // Two unit vectors.
+    QLineF v1(0, 0, 1, 0);
+    QLineF v2(0, 0, 0, 1);
+
+    // Generate the style options
+    QStyleOptionGraphicsItem *styleOptionArray = new QStyleOptionGraphicsItem[numItems];
+    for (int i = 0; i < numItems; ++i) {
+        QGraphicsItem *item = itemArray[i];
+
+        QStyleOptionGraphicsItem option;
+        option.state = QStyle::State_None;
+        option.rect = item->boundingRect().toRect();
+        if (item->isSelected())
+            option.state |= QStyle::State_Selected;
+        if (item->isEnabled())
+            option.state |= QStyle::State_Enabled;
+        if (item->hasFocus())
+            option.state |= QStyle::State_HasFocus;
+        if (d->hoverItems.contains(item))
+            option.state |= QStyle::State_MouseOver;
+        if (item == mouseGrabberItem())
+            option.state |= QStyle::State_Sunken;
+
+        // Calculate a simple level-of-detail metric.
+        // ### almost identical code in QGraphicsView::paintEvent()
+        //     and QGraphicsView::render() - consider refactoring
+        QTransform itemToDeviceTransform;
+        if (item->d_ptr->itemIsUntransformable()) {
+            itemToDeviceTransform = item->deviceTransform(painterTransform);
+        } else {
+            itemToDeviceTransform = item->sceneTransform() * painterTransform;
+        }
+
+        option.levelOfDetail = qSqrt(itemToDeviceTransform.map(v1).length() * itemToDeviceTransform.map(v2).length());
+        option.matrix = itemToDeviceTransform.toAffine(); //### discards perspective
+
+        option.exposedRect = item->boundingRect();
+        option.exposedRect &= itemToDeviceTransform.inverted().mapRect(targetRect);
+
+        styleOptionArray[i] = option;
+    }
+
+    // Render the scene.
+    drawBackground(painter, sourceRect);
+    drawItems(painter, numItems, itemArray, styleOptionArray);
+    drawForeground(painter, sourceRect);
+
+    delete [] itemArray;
+    delete [] styleOptionArray;
+
+    painter->restore();
+}
+
+/*!
+    \property QGraphicsScene::itemIndexMethod
+    \brief the item indexing method.
+
+    QGraphicsScene applies an indexing algorithm to the scene, to speed up
+    item discovery functions like items() and itemAt(). Indexing is most
+    efficient for static scenes (i.e., where items don't move around). For
+    dynamic scenes, or scenes with many animated items, the index bookkeeping
+    can outweight the fast lookup speeds.
+
+    For the common case, the default index method BspTreeIndex works fine.  If
+    your scene uses many animations and you are experiencing slowness, you can
+    disable indexing by calling \c setItemIndexMethod(NoIndex).
+
+    \sa bspTreeDepth
+*/
+QGraphicsScene::ItemIndexMethod QGraphicsScene::itemIndexMethod() const
+{
+    Q_D(const QGraphicsScene);
+    return d->indexMethod;
+}
+void QGraphicsScene::setItemIndexMethod(ItemIndexMethod method)
+{
+    Q_D(QGraphicsScene);
+    d->resetIndex();
+    d->indexMethod = method;
+}
+
+/*!
+    \property QGraphicsScene::bspTreeDepth
+    \brief the depth of QGraphicsScene's BSP index tree
+    \since 4.3
+
+    This property has no effect when NoIndex is used.
+
+    This value determines the depth of QGraphicsScene's BSP tree. The depth
+    directly affects QGraphicsScene's performance and memory usage; the latter
+    growing exponentially with the depth of the tree. With an optimal tree
+    depth, QGraphicsScene can instantly determine the locality of items, even
+    for scenes with thousands or millions of items. This also greatly improves
+    rendering performance.
+
+    By default, the value is 0, in which case Qt will guess a reasonable
+    default depth based on the size, location and number of items in the
+    scene. If these parameters change frequently, however, you may experience
+    slowdowns as QGraphicsScene retunes the depth internally. You can avoid
+    potential slowdowns by fixating the tree depth through setting this
+    property.
+
+    The depth of the tree and the size of the scene rectangle decide the
+    granularity of the scene's partitioning. The size of each scene segment is
+    determined by the following algorithm:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsscene.cpp 2
+
+    The BSP tree has an optimal size when each segment contains between 0 and
+    10 items.
+
+    \sa itemIndexMethod
+*/
+int QGraphicsScene::bspTreeDepth() const
+{
+    Q_D(const QGraphicsScene);
+    return d->bspTreeDepth;
+}
+void QGraphicsScene::setBspTreeDepth(int depth)
+{
+    Q_D(QGraphicsScene);
+    if (d->bspTreeDepth == depth)
+        return;
+
+    if (depth < 0) {
+        qWarning("QGraphicsScene::setBspTreeDepth: invalid depth %d ignored; must be >= 0", depth);
+        return;
+    }
+
+    d->bspTreeDepth = depth;
+    d->resetIndex();
+}
+
+/*!
+    \property QGraphicsScene::sortCacheEnabled
+    \brief whether sort caching is enabled
+    \since 4.5
+
+    When enabled, this property adds a cache that speeds up sorting and
+    transformations for scenes with deep hierarchies (i.e., items with many
+    levels of descendents), at the cost of using more memory (approx. 100 more
+    bytes of memory per item).
+
+    Items that are not part of a deep hierarchy suffer no penalty from this
+    cache.
+*/
+bool QGraphicsScene::isSortCacheEnabled() const
+{
+    Q_D(const QGraphicsScene);
+    return d->sortCacheEnabled;
+}
+void QGraphicsScene::setSortCacheEnabled(bool enabled)
+{
+    Q_D(QGraphicsScene);
+    if (enabled == d->sortCacheEnabled)
+        return;
+    if ((d->sortCacheEnabled = enabled))
+        d->invalidateSortCache();
+}
+
+/*!
+    Calculates and returns the bounding rect of all items on the scene. This
+    function works by iterating over all items, and because if this, it can
+    be slow for large scenes.
+
+    \sa sceneRect()
+*/
+QRectF QGraphicsScene::itemsBoundingRect() const
+{
+    QRectF boundingRect;
+    foreach (QGraphicsItem *item, items())
+        boundingRect |= item->sceneBoundingRect();
+    return boundingRect;
+}
+
+/*!
+    Returns a list of all items on the scene, in no particular order.
+
+    \sa addItem(), removeItem()
+*/
+QList<QGraphicsItem *> QGraphicsScene::items() const
+{
+    Q_D(const QGraphicsScene);
+    const_cast<QGraphicsScenePrivate *>(d)->purgeRemovedItems();
+
+    // If freeItemIndexes is empty, we know there are no holes in indexedItems and
+    // unindexedItems.
+    if (d->freeItemIndexes.isEmpty()) {
+        if (d->unindexedItems.isEmpty())
+            return d->indexedItems;
+        return d->indexedItems + d->unindexedItems;
+    }
+
+    // Rebuild the list of items to avoid holes. ### We could also just
+    // compress the item lists at this point.
+    QList<QGraphicsItem *> itemList;
+    foreach (QGraphicsItem *item, d->indexedItems + d->unindexedItems) {
+        if (item)
+            itemList << item;
+    }
+    return itemList;
+}
+
+/*!
+    Returns all visible items at position \a pos in the scene. The items are
+    listed in descending Z order (i.e., the first item in the list is the
+    top-most item, and the last item is the bottom-most item).
+
+    \sa itemAt()
+*/
+QList<QGraphicsItem *> QGraphicsScene::items(const QPointF &pos) const
+{
+    QList<QGraphicsItem *> itemsAtPoint;
+
+    // Find all items within a 1x1 rect area starting at pos. This can be
+    // inefficient for scenes that use small coordinates (like unity
+    // coordinates), or for detailed graphs. ### The index should support
+    // fetching items at a pos to avoid this limitation.
+    foreach (QGraphicsItem *item, items(QRectF(pos, QSizeF(1, 1)), Qt::IntersectsItemBoundingRect)) {
+        if (item->contains(item->mapFromScene(pos)))
+            itemsAtPoint << item;
+    }
+    return itemsAtPoint;
+}
+
+
+/*!
+    \fn QList<QGraphicsItem *> QGraphicsScene::items(const QRectF &rectangle, Qt::ItemSelectionMode mode) const
+
+    \overload
+
+    Returns all visible items that, depending on \a mode, are either inside or
+    intersect with the specified \a rectangle.
+
+    The default value for \a mode is Qt::IntersectsItemShape; all items whose
+    exact shape intersects with or is contained by \a rectangle are returned.
+
+    \sa itemAt()
+*/
+QList<QGraphicsItem *> QGraphicsScene::items(const QRectF &rect, Qt::ItemSelectionMode mode) const
+{
+    Q_D(const QGraphicsScene);
+    return d->items_helper(rect, mode, Qt::AscendingOrder);
+}
+
+/*!
+    \fn QList<QGraphicsItem *> QGraphicsScene::items(qreal x, qreal y, qreal w, qreal h, Qt::ItemSelectionMode mode) const
+    \since 4.3
+
+    This convenience function is equivalent to calling items(QRectF(\a x, \a y, \a w, \a h), \a mode).
+*/
+
+/*!
+    \overload
+
+    Returns all visible items that, depending on \a mode, are either inside or
+    intersect with the polygon \a polygon.
+
+    The default value for \a mode is Qt::IntersectsItemShape; all items whose
+    exact shape intersects with or is contained by \a polygon are returned.
+
+    \sa itemAt()
+*/
+QList<QGraphicsItem *> QGraphicsScene::items(const QPolygonF &polygon, Qt::ItemSelectionMode mode) const
+{
+    Q_D(const QGraphicsScene);
+    return d->items_helper(polygon, mode, Qt::AscendingOrder);
+}
+
+/*!
+    \overload
+
+    Returns all visible items that, depending on \a path, are either inside or
+    intersect with the path \a path.
+
+    The default value for \a mode is Qt::IntersectsItemShape; all items whose
+    exact shape intersects with or is contained by \a path are returned.
+
+    \sa itemAt()
+*/
+QList<QGraphicsItem *> QGraphicsScene::items(const QPainterPath &path, Qt::ItemSelectionMode mode) const
+{
+    Q_D(const QGraphicsScene);
+    return d->items_helper(path, mode, Qt::AscendingOrder);
+}
+
+/*!
+    Returns a list of all items that collide with \a item. Collisions are
+    determined by calling QGraphicsItem::collidesWithItem(); the collision
+    detection is determined by \a mode. By default, all items whose shape
+    intersects \a item or is contained inside \a item's shape are returned.
+
+    The items are returned in descending Z order (i.e., the first item in the
+    list is the top-most item, and the last item is the bottom-most item).
+
+    \sa items(), itemAt(), QGraphicsItem::collidesWithItem()
+*/
+QList<QGraphicsItem *> QGraphicsScene::collidingItems(const QGraphicsItem *item,
+                                                      Qt::ItemSelectionMode mode) const
+{
+    Q_D(const QGraphicsScene);
+    if (!item) {
+        qWarning("QGraphicsScene::collidingItems: cannot find collisions for null item");
+        return QList<QGraphicsItem *>();
+    }
+
+    QList<QGraphicsItem *> tmp;
+    foreach (QGraphicsItem *itemInVicinity, d->estimateItemsInRect(item->sceneBoundingRect())) {
+        if (item != itemInVicinity && item->collidesWithItem(itemInVicinity, mode))
+            tmp << itemInVicinity;
+    }
+    d->sortItems(&tmp, Qt::AscendingOrder, d->sortCacheEnabled);
+    return tmp;
+}
+
+/*!
+    \fn QGraphicsItem *QGraphicsScene::itemAt(const QPointF &position) const
+
+    Returns the topmost visible item at the specified \a position, or 0 if
+    there are no items at this position.
+
+    \note The topmost item is the one with the highest Z-value.
+
+    \sa items(), collidingItems(), QGraphicsItem::setZValue()
+*/
+QGraphicsItem *QGraphicsScene::itemAt(const QPointF &pos) const
+{
+    QList<QGraphicsItem *> itemsAtPoint = items(pos);
+    return itemsAtPoint.isEmpty() ? 0 : itemsAtPoint.first();
+}
+
+/*!
+    \fn QGraphicsScene::itemAt(qreal x, qreal y) const
+    \overload
+
+    Returns the topmost item at the position specified by (\a x, \a
+    y), or 0 if there are no items at this position.
+
+    This convenience function is equivalent to calling \c
+    {itemAt(QPointF(x, y))}.
+
+    \note The topmost item is the one with the highest Z-value.
+*/
+
+/*!
+    Returns a list of all currently selected items. The items are
+    returned in no particular order.
+
+    \sa setSelectionArea()
+*/
+QList<QGraphicsItem *> QGraphicsScene::selectedItems() const
+{
+    Q_D(const QGraphicsScene);
+
+    // Optimization: Lazily removes items that are not selected.
+    QGraphicsScene *that = const_cast<QGraphicsScene *>(this);
+    QSet<QGraphicsItem *> actuallySelectedSet;
+    foreach (QGraphicsItem *item, that->d_func()->selectedItems) {
+        if (item->isSelected())
+            actuallySelectedSet << item;
+    }
+
+    that->d_func()->selectedItems = actuallySelectedSet;
+
+    return d->selectedItems.values();
+}
+
+/*!
+    Returns the selection area that was previously set with
+    setSelectionArea(), or an empty QPainterPath if no selection area has been
+    set.
+
+    \sa setSelectionArea()
+*/
+QPainterPath QGraphicsScene::selectionArea() const
+{
+    Q_D(const QGraphicsScene);
+    return d->selectionArea;
+}
+
+/*!
+    Sets the selection area to \a path. All items within this area are
+    immediately selected, and all items outside are unselected. You can get
+    the list of all selected items by calling selectedItems().
+
+    For an item to be selected, it must be marked as \e selectable
+    (QGraphicsItem::ItemIsSelectable).
+
+    \sa clearSelection(), selectionArea()
+*/
+void QGraphicsScene::setSelectionArea(const QPainterPath &path)
+{
+    setSelectionArea(path, Qt::IntersectsItemShape);
+}
+
+/*!
+    \overload
+    \since 4.3
+
+    Sets the selection area to \a path using \a mode to determine if items are
+    included in the selection area.
+
+    \sa clearSelection(), selectionArea()
+*/
+void QGraphicsScene::setSelectionArea(const QPainterPath &path, Qt::ItemSelectionMode mode)
+{
+    Q_D(QGraphicsScene);
+
+    // Note: with boolean path operations, we can improve performance here
+    // quite a lot by "growing" the old path instead of replacing it. That
+    // allows us to only check the intersect area for changes, instead of
+    // reevaluating the whole path over again.
+    d->selectionArea = path;
+
+    QSet<QGraphicsItem *> unselectItems = d->selectedItems;
+
+    // Disable emitting selectionChanged() for individual items.
+    ++d->selectionChanging;
+    bool changed = false;
+
+    // Set all items in path to selected.
+    foreach (QGraphicsItem *item, items(path, mode)) {
+        if (item->flags() & QGraphicsItem::ItemIsSelectable) {
+            if (!item->isSelected())
+                changed = true;
+            unselectItems.remove(item);
+            item->setSelected(true);
+        }
+    }
+
+    // Unselect all items outside path.
+    foreach (QGraphicsItem *item, unselectItems) {
+        item->setSelected(false);
+        changed = true;
+    }
+
+    // Reenable emitting selectionChanged() for individual items.
+    --d->selectionChanging;
+
+    if (!d->selectionChanging && changed)
+        emit selectionChanged();
+}
+
+/*!
+   Clears the current selection.
+
+   \sa setSelectionArea(), selectedItems()
+*/
+void QGraphicsScene::clearSelection()
+{
+    Q_D(QGraphicsScene);
+
+    // Disable emitting selectionChanged
+    ++d->selectionChanging;
+    bool changed = !d->selectedItems.isEmpty();
+
+    foreach (QGraphicsItem *item, d->selectedItems)
+        item->setSelected(false);
+    d->selectedItems.clear();
+
+    // Reenable emitting selectionChanged() for individual items.
+    --d->selectionChanging;
+
+    if (!d->selectionChanging && changed)
+        emit selectionChanged();
+}
+
+/*!
+    \since 4.4
+
+    Removes and deletes all items from the scene, but otherwise leaves the
+    state of the scene unchanged.
+
+    \sa addItem()
+*/
+void QGraphicsScene::clear()
+{
+    Q_D(QGraphicsScene);
+    // Recursive descent delete
+    for (int i = 0; i < d->indexedItems.size(); ++i) {
+        if (QGraphicsItem *item = d->indexedItems.at(i)) {
+            if (!item->parentItem())
+                delete item;
+        }
+    }
+    QList<QGraphicsItem *> unindexedParents;
+    for (int i = 0; i < d->unindexedItems.size(); ++i) {
+        QGraphicsItem *item = d->unindexedItems.at(i);
+        if (!item->parentItem())
+            unindexedParents << item;
+    }
+    d->unindexedItems.clear();
+    qDeleteAll(unindexedParents);
+
+    d->indexedItems.clear();
+    d->freeItemIndexes.clear();
+    d->lastItemCount = 0;
+    d->bspTree.clear();
+    d->largestUntransformableItem = QRectF();
+}
+
+/*!
+    Groups all items in \a items into a new QGraphicsItemGroup, and returns a
+    pointer to the group. The group is created with the common ancestor of \a
+    items as its parent, and with position (0, 0). The items are all
+    reparented to the group, and their positions and transformations are
+    mapped to the group. If \a items is empty, this function will return an
+    empty top-level QGraphicsItemGroup.
+
+    QGraphicsScene has ownership of the group item; you do not need to delete
+    it. To dismantle (ungroup) a group, call destroyItemGroup().
+
+    \sa destroyItemGroup(), QGraphicsItemGroup::addToGroup()
+*/
+QGraphicsItemGroup *QGraphicsScene::createItemGroup(const QList<QGraphicsItem *> &items)
+{
+    // Build a list of the first item's ancestors
+    QList<QGraphicsItem *> ancestors;
+    int n = 0;
+    if (!items.isEmpty()) {
+        QGraphicsItem *parent = items.at(n++);
+        while ((parent = parent->parentItem()))
+            ancestors.append(parent);
+    }
+
+    // Find the common ancestor for all items
+    QGraphicsItem *commonAncestor = 0;
+    if (!ancestors.isEmpty()) {
+        while (n < items.size()) {
+            int commonIndex = -1;
+            QGraphicsItem *parent = items.at(n++);
+            do {
+                int index = ancestors.indexOf(parent, qMax(0, commonIndex));
+                if (index != -1) {
+                    commonIndex = index;
+                    break;
+                }
+            } while ((parent = parent->parentItem()));
+
+            if (commonIndex == -1) {
+                commonAncestor = 0;
+                break;
+            }
+
+            commonAncestor = ancestors.at(commonIndex);
+        }
+    }
+
+    // Create a new group at that level
+    QGraphicsItemGroup *group = new QGraphicsItemGroup(commonAncestor);
+    if (!commonAncestor)
+        addItem(group);
+    foreach (QGraphicsItem *item, items)
+        group->addToGroup(item);
+    return group;
+}
+
+/*!
+    Reparents all items in \a group to \a group's parent item, then removes \a
+    group from the scene, and finally deletes it. The items' positions and
+    transformations are mapped from the group to the group's parent.
+
+    \sa createItemGroup(), QGraphicsItemGroup::removeFromGroup()
+*/
+void QGraphicsScene::destroyItemGroup(QGraphicsItemGroup *group)
+{
+    foreach (QGraphicsItem *item, group->children())
+        group->removeFromGroup(item);
+    removeItem(group);
+    delete group;
+}
+
+/*!
+    Adds or moves the item \a item and all its childen to the scene.
+
+    If the item is visible (i.e., QGraphicsItem::isVisible() returns
+    true), QGraphicsScene will emit changed() once control goes back
+    to the event loop.
+
+    If the item is already in a different scene, it will first be removed from
+    its old scene, and then added to this scene as a top-level.
+
+    QGraphicsScene will send ItemSceneChange notifications to \a item while
+    it is added to the scene. If item does not currently belong to a scene, only one
+    notification is sent. If it does belong to scene already (i.e., it is
+    moved to this scene), QGraphicsScene will send an addition notification as
+    the item is removed from its previous scene.
+
+    \sa removeItem(), addEllipse(), addLine(), addPath(), addPixmap(),
+    addRect(), addText(), addWidget()
+*/
+void QGraphicsScene::addItem(QGraphicsItem *item)
+{
+    Q_D(QGraphicsScene);
+    if (!item) {
+        qWarning("QGraphicsScene::addItem: cannot add null item");
+        return;
+    }
+    if (item->scene() == this) {
+        qWarning("QGraphicsScene::addItem: item has already been added to this scene");
+        return;
+    }
+
+    // Remove this item from its existing scene
+    if (QGraphicsScene *oldScene = item->scene())
+        oldScene->removeItem(item);
+
+    // Notify the item that its scene is changing, and allow the item to
+    // react.
+    QGraphicsScene *targetScene = qVariantValue<QGraphicsScene *>(item->itemChange(QGraphicsItem::ItemSceneChange,
+                                                                                   qVariantFromValue<QGraphicsScene *>(this)));
+    if (targetScene != this) {
+        if (targetScene && item->scene() != targetScene)
+            targetScene->addItem(item);
+        return;
+    }
+
+    // Prevent reusing a recently deleted pointer: purge all removed items
+    // from our lists.
+    d->purgeRemovedItems();
+
+    // Invalidate any sort caching; arrival of a new item means we need to
+    // resort.
+    d->invalidateSortCache();
+
+    // Detach this item from its parent if the parent's scene is different
+    // from this scene.
+    if (QGraphicsItem *itemParent = item->parentItem()) {
+        if (itemParent->scene() != this)
+            item->setParentItem(0);
+    }
+
+    // Add the item to this scene
+    item->d_func()->scene = targetScene;
+
+    // Indexing requires sceneBoundingRect(), but because \a item might
+    // not be completely constructed at this point, we need to store it in
+    // a temporary list and schedule an indexing for later.
+    d->unindexedItems << item;
+    item->d_func()->index = -1;
+    d->startIndexTimer();
+
+    // Update the scene's sort cache settings.
+    item->d_ptr->globalStackingOrder = -1;
+    d->invalidateSortCache();
+
+    // Add to list of items that require an update. We cannot assume that the
+    // item is fully constructed, so calling item->update() can lead to a pure
+    // virtual function call to boundingRect().
+    if (!d->updateAll) {
+        if (d->pendingUpdateItems.isEmpty())
+            QMetaObject::invokeMethod(this, "_q_updateLater", Qt::QueuedConnection);
+        d->pendingUpdateItems << item;
+    }
+
+    // Disable selectionChanged() for individual items
+    ++d->selectionChanging;
+    int oldSelectedItemSize = d->selectedItems.size();
+
+    // Update selection lists
+    if (item->isSelected())
+        d->selectedItems << item;
+    if (item->isWidget() && item->isVisible() && static_cast<QGraphicsWidget *>(item)->windowType() == Qt::Popup)
+        d->addPopup(static_cast<QGraphicsWidget *>(item));
+
+    // Update creation order focus chain. Make sure to leave the widget's
+    // internal tab order intact.
+    if (item->isWidget()) {
+        QGraphicsWidget *widget = static_cast<QGraphicsWidget *>(item);
+        if (!d->tabFocusFirst) {
+            // No first tab focus widget - make this the first tab focus
+            // widget.
+            d->tabFocusFirst = widget;
+        } else if (!widget->parentWidget()) {
+            // Adding a widget that is not part of a tab focus chain.
+            QGraphicsWidget *last = d->tabFocusFirst->d_func()->focusPrev;
+            QGraphicsWidget *lastNew = widget->d_func()->focusPrev;
+            last->d_func()->focusNext = widget;
+            widget->d_func()->focusPrev = last;
+            d->tabFocusFirst->d_func()->focusPrev = lastNew;
+            lastNew->d_func()->focusNext = d->tabFocusFirst;
+        }
+    }
+
+    // Add all children recursively
+    foreach (QGraphicsItem *child, item->children())
+        addItem(child);
+
+    // Resolve font and palette.
+    item->d_ptr->resolveFont(d->font.resolve());
+    item->d_ptr->resolvePalette(d->palette.resolve());
+
+    if (!item->d_ptr->explicitlyHidden) {
+       if (d->unpolishedItems.isEmpty())
+           QMetaObject::invokeMethod(this, "_q_polishItems", Qt::QueuedConnection);
+       d->unpolishedItems << item;
+    }
+
+    // Reenable selectionChanged() for individual items
+    --d->selectionChanging;
+    if (!d->selectionChanging && d->selectedItems.size() != oldSelectedItemSize)
+        emit selectionChanged();
+
+    // Deliver post-change notification
+    item->itemChange(QGraphicsItem::ItemSceneHasChanged, qVariantFromValue<QGraphicsScene *>(this));
+}
+
+/*!
+    Creates and adds an ellipse item to the scene, and returns the item
+    pointer. The geometry of the ellipse is defined by \a rect, and its pen
+    and brush are initialized to \a pen and \a brush.
+
+    Note that the item's geometry is provided in item coordinates, and its
+    position is initialized to (0, 0).
+
+    If the item is visible (i.e., QGraphicsItem::isVisible() returns true),
+    QGraphicsScene will emit changed() once control goes back to the event
+    loop.
+
+    \sa addLine(), addPath(), addPixmap(), addRect(), addText(), addItem(),
+    addWidget()
+*/
+QGraphicsEllipseItem *QGraphicsScene::addEllipse(const QRectF &rect, const QPen &pen, const QBrush &brush)
+{
+    QGraphicsEllipseItem *item = new QGraphicsEllipseItem(rect);
+    item->setPen(pen);
+    item->setBrush(brush);
+    addItem(item);
+    return item;
+}
+
+/*!
+    \fn QGraphicsEllipseItem *QGraphicsScene::addEllipse(qreal x, qreal y, qreal w, qreal h, const QPen &pen, const QBrush &brush)
+    \since 4.3
+
+    This convenience function is equivalent to calling addEllipse(QRectF(\a x,
+    \a y, \a w, \a h), \a pen, \a brush).
+*/
+
+/*!
+    Creates and adds a line item to the scene, and returns the item
+    pointer. The geometry of the line is defined by \a line, and its pen
+    is initialized to \a pen.
+
+    Note that the item's geometry is provided in item coordinates, and its
+    position is initialized to (0, 0).
+
+    If the item is visible (i.e., QGraphicsItem::isVisible() returns true),
+    QGraphicsScene will emit changed() once control goes back to the event
+    loop.
+
+    \sa addEllipse(), addPath(), addPixmap(), addRect(), addText(), addItem(),
+    addWidget()
+*/
+QGraphicsLineItem *QGraphicsScene::addLine(const QLineF &line, const QPen &pen)
+{
+    QGraphicsLineItem *item = new QGraphicsLineItem(line);
+    item->setPen(pen);
+    addItem(item);
+    return item;
+}
+
+/*!
+    \fn QGraphicsLineItem *QGraphicsScene::addLine(qreal x1, qreal y1, qreal x2, qreal y2, const QPen &pen)
+    \since 4.3
+
+    This convenience function is equivalent to calling addLine(QLineF(\a x1,
+    \a y1, \a x2, \a y2), \a pen).
+*/
+
+/*!
+    Creates and adds a path item to the scene, and returns the item
+    pointer. The geometry of the path is defined by \a path, and its pen and
+    brush are initialized to \a pen and \a brush.
+
+    Note that the item's geometry is provided in item coordinates, and its
+    position is initialized to (0, 0).
+
+    If the item is visible (i.e., QGraphicsItem::isVisible() returns true),
+    QGraphicsScene will emit changed() once control goes back to the event
+    loop.
+
+    \sa addEllipse(), addLine(), addPixmap(), addRect(), addText(), addItem(),
+    addWidget()
+*/
+QGraphicsPathItem *QGraphicsScene::addPath(const QPainterPath &path, const QPen &pen, const QBrush &brush)
+{
+    QGraphicsPathItem *item = new QGraphicsPathItem(path);
+    item->setPen(pen);
+    item->setBrush(brush);
+    addItem(item);
+    return item;
+}
+
+/*!
+    Creates and adds a pixmap item to the scene, and returns the item
+    pointer. The pixmap is defined by \a pixmap.
+
+    Note that the item's geometry is provided in item coordinates, and its
+    position is initialized to (0, 0).
+
+    If the item is visible (i.e., QGraphicsItem::isVisible() returns true),
+    QGraphicsScene will emit changed() once control goes back to the event
+    loop.
+
+    \sa addEllipse(), addLine(), addPath(), addRect(), addText(), addItem(),
+    addWidget()
+*/
+QGraphicsPixmapItem *QGraphicsScene::addPixmap(const QPixmap &pixmap)
+{
+    QGraphicsPixmapItem *item = new QGraphicsPixmapItem(pixmap);
+    addItem(item);
+    return item;
+}
+
+/*!
+    Creates and adds a polygon item to the scene, and returns the item
+    pointer. The polygon is defined by \a polygon, and its pen and
+    brush are initialized to \a pen and \a brush.
+
+    Note that the item's geometry is provided in item coordinates, and its
+    position is initialized to (0, 0).
+
+    If the item is visible (i.e., QGraphicsItem::isVisible() returns true),
+    QGraphicsScene will emit changed() once control goes back to the event
+    loop.
+
+    \sa addEllipse(), addLine(), addPath(), addRect(), addText(), addItem(),
+    addWidget()
+*/
+QGraphicsPolygonItem *QGraphicsScene::addPolygon(const QPolygonF &polygon,
+                                                 const QPen &pen, const QBrush &brush)
+{
+    QGraphicsPolygonItem *item = new QGraphicsPolygonItem(polygon);
+    item->setPen(pen);
+    item->setBrush(brush);
+    addItem(item);
+    return item;
+}
+
+/*!
+    Creates and adds a rectangle item to the scene, and returns the item
+    pointer. The geometry of the rectangle is defined by \a rect, and its pen
+    and brush are initialized to \a pen and \a brush.
+
+    Note that the item's geometry is provided in item coordinates, and its
+    position is initialized to (0, 0). For example, if a QRect(50, 50, 100,
+    100) is added, its top-left corner will be at (50, 50) relative to the
+    origin in the items coordinate system.
+
+    If the item is visible (i.e., QGraphicsItem::isVisible() returns true),
+    QGraphicsScene will emit changed() once control goes back to the event
+    loop.
+
+    \sa addEllipse(), addLine(), addPixmap(), addPixmap(), addText(),
+    addItem(), addWidget()
+*/
+QGraphicsRectItem *QGraphicsScene::addRect(const QRectF &rect, const QPen &pen, const QBrush &brush)
+{
+    QGraphicsRectItem *item = new QGraphicsRectItem(rect);
+    item->setPen(pen);
+    item->setBrush(brush);
+    addItem(item);
+    return item;
+}
+
+/*!
+    \fn QGraphicsRectItem *QGraphicsScene::addRect(qreal x, qreal y, qreal w, qreal h, const QPen &pen, const QBrush &brush)
+    \since 4.3
+
+    This convenience function is equivalent to calling addRect(QRectF(\a x,
+    \a y, \a w, \a h), \a pen, \a brush).
+*/
+
+/*!
+    Creates and adds a text item to the scene, and returns the item
+    pointer. The text string is initialized to \a text, and its font
+    is initialized to \a font.
+
+    The item's position is initialized to (0, 0).
+
+    If the item is visible (i.e., QGraphicsItem::isVisible() returns true),
+    QGraphicsScene will emit changed() once control goes back to the event
+    loop.
+
+    \sa addEllipse(), addLine(), addPixmap(), addPixmap(), addRect(),
+    addItem(), addWidget()
+*/
+QGraphicsTextItem *QGraphicsScene::addText(const QString &text, const QFont &font)
+{
+    QGraphicsTextItem *item = new QGraphicsTextItem(text);
+    item->setFont(font);
+    addItem(item);
+    return item;
+}
+
+/*!
+    Creates and adds a QGraphicsSimpleTextItem to the scene, and returns the
+    item pointer. The text string is initialized to \a text, and its font is
+    initialized to \a font.
+
+    The item's position is initialized to (0, 0).
+
+    If the item is visible (i.e., QGraphicsItem::isVisible() returns true),
+    QGraphicsScene will emit changed() once control goes back to the event
+    loop.
+
+    \sa addEllipse(), addLine(), addPixmap(), addPixmap(), addRect(),
+    addItem(), addWidget()
+*/
+QGraphicsSimpleTextItem *QGraphicsScene::addSimpleText(const QString &text, const QFont &font)
+{
+    QGraphicsSimpleTextItem *item = new QGraphicsSimpleTextItem(text);
+    item->setFont(font);
+    addItem(item);
+    return item;
+}
+
+/*!
+    Creates a new QGraphicsProxyWidget for \a widget, adds it to the scene,
+    and returns a pointer to the proxy. \a wFlags set the default window flags
+    for the embedding proxy widget.
+
+    The item's position is initialized to (0, 0).
+
+    If the item is visible (i.e., QGraphicsItem::isVisible() returns true),
+    QGraphicsScene will emit changed() once control goes back to the event
+    loop.
+
+    Note that widgets with the Qt::WA_PaintOnScreen widget attribute
+    set and widgets that wrap an external application or controller
+    are not supported. Examples are QGLWidget and QAxWidget.
+
+    \sa addEllipse(), addLine(), addPixmap(), addPixmap(), addRect(),
+    addText(), addSimpleText(), addItem()
+*/
+QGraphicsProxyWidget *QGraphicsScene::addWidget(QWidget *widget, Qt::WindowFlags wFlags)
+{
+    QGraphicsProxyWidget *proxy = new QGraphicsProxyWidget(0, wFlags);
+    proxy->setWidget(widget);
+    addItem(proxy);
+    return proxy;
+}
+
+/*!
+    Removes the item \a item and all its children from the scene.  The
+    ownership of \a item is passed on to the caller (i.e.,
+    QGraphicsScene will no longer delete \a item when destroyed).
+
+    \sa addItem()
+*/
+void QGraphicsScene::removeItem(QGraphicsItem *item)
+{
+    // ### Refactoring: This function shares much functionality with _q_removeItemLater()
+    Q_D(QGraphicsScene);
+    if (!item) {
+        qWarning("QGraphicsScene::removeItem: cannot remove 0-item");
+        return;
+    }
+    if (item->scene() != this) {
+        qWarning("QGraphicsScene::removeItem: item %p's scene (%p)"
+                 " is different from this scene (%p)",
+                 item, item->scene(), this);
+        return;
+    }
+
+    // Notify the item that it's scene is changing to 0, allowing the item to
+    // react.
+    QGraphicsScene *targetScene = qVariantValue<QGraphicsScene *>(item->itemChange(QGraphicsItem::ItemSceneChange,
+                                                                                   qVariantFromValue<QGraphicsScene *>(0)));
+    if (targetScene != 0 && targetScene != this) {
+        targetScene->addItem(item);
+        return;
+    }
+
+    // If the item has focus, remove it (and any focusWidget reference).
+    item->clearFocus();
+
+    // Clear its background
+    item->update();
+
+    // Note: This will access item's sceneBoundingRect(), which (as this is
+    // C++) is why we cannot call removeItem() from QGraphicsItem's
+    // destructor.
+    d->removeFromIndex(item);
+
+    if (item == d->tabFocusFirst) {
+        QGraphicsWidget *widget = static_cast<QGraphicsWidget *>(item);
+        widget->d_func()->fixFocusChainBeforeReparenting(0, 0);
+    }
+    // Set the item's scene ptr to 0.
+    item->d_func()->scene = 0;
+
+    // Detach the item from its parent.
+    if (QGraphicsItem *parentItem = item->parentItem()) {
+        if (parentItem->scene()) {
+            Q_ASSERT_X(parentItem->scene() == this, "QGraphicsScene::removeItem",
+                       "Parent item's scene is different from this item's scene");
+            item->setParentItem(0);
+        }
+    }
+
+    // Remove from our item lists.
+    int index = item->d_func()->index;
+    if (index != -1) {
+        d->freeItemIndexes << index;
+        d->indexedItems[index] = 0;
+    } else {
+        d->unindexedItems.removeAll(item);
+    }
+
+    // Remove from scene transform cache
+    int transformIndex = item->d_func()->sceneTransformIndex;
+    if (transformIndex != -1) {
+        d->validTransforms.setBit(transformIndex, 0);
+        d->freeSceneTransformSlots.append(transformIndex);
+        item->d_func()->sceneTransformIndex = -1;
+    }
+
+    if (item == d->focusItem)
+        d->focusItem = 0;
+    if (item == d->lastFocusItem)
+        d->lastFocusItem = 0;
+    if (item == d->activeWindow) {
+        // ### deactivate...
+        d->activeWindow = 0;
+    }
+
+    // Disable selectionChanged() for individual items
+    ++d->selectionChanging;
+    int oldSelectedItemsSize = d->selectedItems.size();
+
+    // Update selected & hovered item bookkeeping
+    d->selectedItems.remove(item);
+    d->hoverItems.removeAll(item);
+    d->pendingUpdateItems.removeAll(item);
+    d->cachedItemsUnderMouse.removeAll(item);
+    d->unpolishedItems.removeAll(item);
+    d->dirtyItems.removeAll(item);
+
+    //Ensure dirty flag have the correct default value so the next time it will be added it will receive updates
+    item->d_func()->dirty = 0;
+    item->d_func()->dirtyChildren = 0;
+
+    // Remove all children recursively
+    foreach (QGraphicsItem *child, item->children())
+        removeItem(child);
+
+    // Reset the mouse grabber and focus item data.
+    if (d->mouseGrabberItems.contains(item))
+        d->ungrabMouse(item);
+
+    // Reset the keyboard grabber
+    if (d->keyboardGrabberItems.contains(item))
+        item->ungrabKeyboard();
+
+    // Reset the last mouse grabber item
+    if (item == d->lastMouseGrabberItem)
+        d->lastMouseGrabberItem = 0;
+
+    // Reenable selectionChanged() for individual items
+    --d->selectionChanging;
+
+    if (!d->selectionChanging && d->selectedItems.size() != oldSelectedItemsSize)
+        emit selectionChanged();
+
+    // Deliver post-change notification
+    item->itemChange(QGraphicsItem::ItemSceneHasChanged, qVariantFromValue<QGraphicsScene *>(0));
+}
+
+/*!
+    Returns the scene's current focus item, or 0 if no item currently has
+    focus.
+
+    The focus item receives keyboard input when the scene receives a
+    key event.
+
+    \sa setFocusItem(), QGraphicsItem::hasFocus()
+*/
+QGraphicsItem *QGraphicsScene::focusItem() const
+{
+    Q_D(const QGraphicsScene);
+    return d->focusItem;
+}
+
+/*!
+    Sets the scene's focus item to \a item, with the focus reason \a
+    focusReason, after removing focus from any previous item that may have had
+    focus.
+
+    If \a item is 0, or if it either does not accept focus (i.e., it does not
+    have the QGraphicsItem::ItemIsFocusable flag enabled), or is not visible
+    or not enabled, this function only removes focus from any previous
+    focusitem.
+
+    If item is not 0, and the scene does not currently have focus (i.e.,
+    hasFocus() returns false), this function will call setFocus()
+    automatically.
+
+    \sa focusItem(), hasFocus(), setFocus()
+*/
+void QGraphicsScene::setFocusItem(QGraphicsItem *item, Qt::FocusReason focusReason)
+{
+    Q_D(QGraphicsScene);
+    if (item == d->focusItem)
+        return;
+    if (item && (!(item->flags() & QGraphicsItem::ItemIsFocusable)
+                 || !item->isVisible() || !item->isEnabled())) {
+        item = 0;
+    }
+
+    if (item) {
+        setFocus(focusReason);
+        if (item == d->focusItem)
+            return;
+    }
+
+    if (d->focusItem) {
+        QFocusEvent event(QEvent::FocusOut, focusReason);
+        d->lastFocusItem = d->focusItem;
+        d->focusItem = 0;
+        d->sendEvent(d->lastFocusItem, &event);
+    }
+
+    if (item) {
+        if (item->isWidget()) {
+            // Update focus child chain.
+            static_cast<QGraphicsWidget *>(item)->d_func()->setFocusWidget();
+        }
+
+        d->focusItem = item;
+        QFocusEvent event(QEvent::FocusIn, focusReason);
+        d->sendEvent(item, &event);
+    }
+}
+
+/*!
+    Returns true if the scene has focus; otherwise returns false. If the scene
+    has focus, it will will forward key events from QKeyEvent to any item that
+    has focus.
+
+    \sa setFocus(), setFocusItem()
+*/
+bool QGraphicsScene::hasFocus() const
+{
+    Q_D(const QGraphicsScene);
+    return d->hasFocus;
+}
+
+/*!
+    Sets focus on the scene by sending a QFocusEvent to the scene, passing \a
+    focusReason as the reason. If the scene regains focus after having
+    previously lost it while an item had focus, the last focus item will
+    receive focus with \a focusReason as the reason.
+
+    If the scene already has focus, this function does nothing.
+
+    \sa hasFocus(), clearFocus(), setFocusItem()
+*/
+void QGraphicsScene::setFocus(Qt::FocusReason focusReason)
+{
+    Q_D(QGraphicsScene);
+    if (d->hasFocus)
+        return;
+    QFocusEvent event(QEvent::FocusIn, focusReason);
+    QCoreApplication::sendEvent(this, &event);
+}
+
+/*!
+    Clears focus from the scene. If any item has focus when this function is
+    called, it will lose focus, and regain focus again once the scene regains
+    focus.
+
+    A scene that does not have focus ignores key events.
+
+    \sa hasFocus(), setFocus(), setFocusItem()
+*/
+void QGraphicsScene::clearFocus()
+{
+    Q_D(QGraphicsScene);
+    if (d->hasFocus) {
+        d->hasFocus = false;
+        setFocusItem(0, Qt::OtherFocusReason);
+    }
+}
+
+/*!
+    \property QGraphicsScene::stickyFocus
+    \brief whether or not clicking the scene will clear focus
+
+    If this property is false (the default), then clicking on the scene
+    background or on an item that does not accept focus, will clear
+    focus. Otherwise, focus will remain unchanged.
+
+    The focus change happens in response to a mouse press. You can reimplement
+    mousePressEvent() in a subclass of QGraphicsScene to toggle this property
+    based on where the user has clicked.
+
+    \sa clearFocus(), setFocusItem()
+*/
+void QGraphicsScene::setStickyFocus(bool enabled)
+{
+    Q_D(QGraphicsScene);
+    d->stickyFocus = enabled;
+}
+bool QGraphicsScene::stickyFocus() const
+{
+    Q_D(const QGraphicsScene);
+    return d->stickyFocus;
+}
+
+/*!
+    Returns the current mouse grabber item, or 0 if no item is currently
+    grabbing the mouse. The mouse grabber item is the item that receives all
+    mouse events sent to the scene.
+
+    An item becomes a mouse grabber when it receives and accepts a
+    mouse press event, and it stays the mouse grabber until either of
+    the following events occur:
+
+    \list
+    \o If the item receives a mouse release event when there are no other
+    buttons pressed, it loses the mouse grab.
+    \o If the item becomes invisible (i.e., someone calls \c {item->setVisible(false))},
+    or if it becomes disabled (i.e., someone calls \c {item->setEnabled(false))},
+    it loses the mouse grab.
+    \o If the item is removed from the scene, it loses the mouse grab.
+    \endlist
+
+    If the item loses its mouse grab, the scene will ignore all mouse events
+    until a new item grabs the mouse (i.e., until a new item receives a mouse
+    press event).
+*/
+QGraphicsItem *QGraphicsScene::mouseGrabberItem() const
+{
+    Q_D(const QGraphicsScene);
+    return !d->mouseGrabberItems.isEmpty() ? d->mouseGrabberItems.last() : 0;
+}
+
+/*!
+    \property QGraphicsScene::backgroundBrush
+    \brief the background brush of the scene.
+
+    Set this property to changes the scene's background to a different color,
+    gradient or texture. The default background brush is Qt::NoBrush. The
+    background is drawn before (behind) the items.
+
+    Example:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsscene.cpp 3
+
+    QGraphicsScene::render() calls drawBackground() to draw the scene
+    background. For more detailed control over how the background is drawn,
+    you can reimplement drawBackground() in a subclass of QGraphicsScene.
+*/
+QBrush QGraphicsScene::backgroundBrush() const
+{
+    Q_D(const QGraphicsScene);
+    return d->backgroundBrush;
+}
+void QGraphicsScene::setBackgroundBrush(const QBrush &brush)
+{
+    Q_D(QGraphicsScene);
+    d->backgroundBrush = brush;
+    foreach (QGraphicsView *view, d->views) {
+        view->resetCachedContent();
+        view->viewport()->update();
+    }
+    update();
+}
+
+/*!
+    \property QGraphicsScene::foregroundBrush
+    \brief the foreground brush of the scene.
+
+    Change this property to set the scene's foreground to a different
+    color, gradient or texture.
+
+    The foreground is drawn after (on top of) the items. The default
+    foreground brush is Qt::NoBrush ( i.e. the foreground is not
+    drawn).
+
+    Example:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsscene.cpp 4
+
+    QGraphicsScene::render() calls drawForeground() to draw the scene
+    foreground. For more detailed control over how the foreground is
+    drawn, you can reimplement the drawForeground() function in a
+    QGraphicsScene subclass.
+*/
+QBrush QGraphicsScene::foregroundBrush() const
+{
+    Q_D(const QGraphicsScene);
+    return d->foregroundBrush;
+}
+void QGraphicsScene::setForegroundBrush(const QBrush &brush)
+{
+    Q_D(QGraphicsScene);
+    d->foregroundBrush = brush;
+    foreach (QGraphicsView *view, views())
+        view->viewport()->update();
+    update();
+}
+
+/*!
+    This method is used by input methods to query a set of properties of
+    the scene to be able to support complex input method operations as support
+    for surrounding text and reconversions.
+
+    The \a query parameter specifies which property is queried.
+
+    \sa QWidget::inputMethodQuery()
+*/
+QVariant QGraphicsScene::inputMethodQuery(Qt::InputMethodQuery query) const
+{
+    Q_D(const QGraphicsScene);
+    if (!d->focusItem)
+        return QVariant();
+    const QTransform matrix = d->focusItem->sceneTransform();
+    QVariant value = d->focusItem->inputMethodQuery(query);
+    if (value.type() == QVariant::RectF)
+        value = matrix.mapRect(value.toRectF());
+    else if (value.type() == QVariant::PointF)
+        value = matrix.map(value.toPointF());
+    else if (value.type() == QVariant::Rect)
+        value = matrix.mapRect(value.toRect());
+    else if (value.type() == QVariant::Point)
+        value = matrix.map(value.toPoint());
+    return value;
+}
+
+/*!
+    \fn void QGraphicsScene::update(const QRectF &rect)
+    Schedules a redraw of the area \a rect on the scene.
+
+    \sa sceneRect(), changed()
+*/
+void QGraphicsScene::update(const QRectF &rect)
+{
+    Q_D(QGraphicsScene);
+    if (d->updateAll)
+        return;
+
+    // Check if anyone's connected; if not, we can send updates directly to
+    // the views. Otherwise or if there are no views, use old behavior.
+    bool directUpdates = !(d->connectedSignals & d->changedSignalMask) && !d->views.isEmpty();
+    if (rect.isNull()) {
+        d->updateAll = true;
+        d->updatedRects.clear();
+        if (directUpdates) {
+            // Update all views.
+            for (int i = 0; i < d->views.size(); ++i)
+                d->views.at(i)->d_func()->updateAll();
+        }
+    } else {
+        if (directUpdates) {
+            // Update all views.
+            for (int i = 0; i < d->views.size(); ++i) {
+                QGraphicsView *view = d->views.at(i);
+                view->d_func()->updateRegion(QRegion(view->mapFromScene(rect).boundingRect()));
+            }
+        } else {
+            d->updatedRects << rect;
+        }
+    }
+
+    if (!directUpdates && !d->calledEmitUpdated) {
+        d->calledEmitUpdated = true;
+        QMetaObject::invokeMethod(this, "_q_emitUpdated", Qt::QueuedConnection);
+    }
+}
+
+/*!
+    \fn void QGraphicsScene::update(qreal x, qreal y, qreal w, qreal h)
+    \overload
+    \since 4.3
+
+    This function is equivalent to calling update(QRectF(\a x, \a y, \a w,
+    \a h));
+*/
+
+/*!
+    Invalidates and schedules a redraw of the \a layers in \a rect on the
+    scene. Any cached content in \a layers is unconditionally invalidated and
+    redrawn.
+
+    You can use this function overload to notify QGraphicsScene of changes to
+    the background or the foreground of the scene. This function is commonly
+    used for scenes with tile-based backgrounds to notify changes when
+    QGraphicsView has enabled
+    \l{QGraphicsView::CacheBackground}{CacheBackground}.
+
+    Example:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsscene.cpp 5
+
+    Note that QGraphicsView currently supports background caching only (see
+    QGraphicsView::CacheBackground). This function is equivalent to calling
+    update() if any layer but BackgroundLayer is passed.
+
+    \sa QGraphicsView::resetCachedContent()
+*/
+void QGraphicsScene::invalidate(const QRectF &rect, SceneLayers layers)
+{
+    foreach (QGraphicsView *view, views())
+        view->invalidateScene(rect, layers);
+    update(rect);
+}
+
+/*!
+    \fn void QGraphicsScene::invalidate(qreal x, qreal y, qreal w, qreal h, SceneLayers layers)
+    \overload
+    \since 4.3
+
+    This convenience function is equivalent to calling invalidate(QRectF(\a x, \a
+    y, \a w, \a h), \a layers);
+*/
+
+/*!
+    Returns a list of all the views that display this scene.
+
+    \sa QGraphicsView::scene()
+*/
+QList <QGraphicsView *> QGraphicsScene::views() const
+{
+    Q_D(const QGraphicsScene);
+    return d->views;
+}
+
+/*!
+    This slot \e advances the scene by one step, by calling
+    QGraphicsItem::advance() for all items on the scene. This is done in two
+    phases: in the first phase, all items are notified that the scene is about
+    to change, and in the second phase all items are notified that they can
+    move. In the first phase, QGraphicsItem::advance() is called passing a
+    value of 0 as an argument, and 1 is passed in the second phase.
+
+    \sa QGraphicsItem::advance(), QGraphicsItemAnimation, QTimeLine
+*/
+void QGraphicsScene::advance()
+{
+    for (int i = 0; i < 2; ++i) {
+        foreach (QGraphicsItem *item, items())
+            item->advance(i);
+    }
+}
+
+/*!
+    Processes the event \a event, and dispatches it to the respective
+    event handlers.
+
+    In addition to calling the convenience event handlers, this
+    function is responsible for converting mouse move events to hover
+    events for when there is no mouse grabber item. Hover events are
+    delivered directly to items; there is no convenience function for
+    them.
+
+    Unlike QWidget, QGraphicsScene does not have the convenience functions
+    \l{QWidget::}{enterEvent()} and \l{QWidget::}{leaveEvent()}. Use this
+    function to obtain those events instead.
+
+    \sa contextMenuEvent(), keyPressEvent(), keyReleaseEvent(),
+    mousePressEvent(), mouseMoveEvent(), mouseReleaseEvent(),
+    mouseDoubleClickEvent(), focusInEvent(), focusOutEvent()
+*/
+bool QGraphicsScene::event(QEvent *event)
+{
+    Q_D(QGraphicsScene);
+
+    switch (event->type()) {
+    case QEvent::GraphicsSceneMousePress:
+    case QEvent::GraphicsSceneMouseMove:
+    case QEvent::GraphicsSceneMouseRelease:
+    case QEvent::GraphicsSceneMouseDoubleClick:
+    case QEvent::GraphicsSceneHoverEnter:
+    case QEvent::GraphicsSceneHoverLeave:
+    case QEvent::GraphicsSceneHoverMove:
+        // Reset the under-mouse list to ensure that this event gets fresh
+        // item-under-mouse data. Be careful about this list; if people delete
+        // items from inside event handlers, this list can quickly end up
+        // having stale pointers in it. We need to clear it before dispatching
+        // events that use it.
+        d->cachedItemsUnderMouse.clear();
+    default:
+        break;
+    }
+
+    switch (event->type()) {
+    case QEvent::GraphicsSceneDragEnter:
+        dragEnterEvent(static_cast<QGraphicsSceneDragDropEvent *>(event));
+        break;
+    case QEvent::GraphicsSceneDragMove:
+        dragMoveEvent(static_cast<QGraphicsSceneDragDropEvent *>(event));
+        break;
+    case QEvent::GraphicsSceneDragLeave:
+        dragLeaveEvent(static_cast<QGraphicsSceneDragDropEvent *>(event));
+        break;
+    case QEvent::GraphicsSceneDrop:
+        dropEvent(static_cast<QGraphicsSceneDragDropEvent *>(event));
+        break;
+    case QEvent::GraphicsSceneContextMenu:
+        contextMenuEvent(static_cast<QGraphicsSceneContextMenuEvent *>(event));
+        break;
+    case QEvent::KeyPress:
+        if (!d->focusItem) {
+            QKeyEvent *k = static_cast<QKeyEvent *>(event);
+            if (k->key() == Qt::Key_Tab || k->key() == Qt::Key_Backtab) {
+                if (!(k->modifiers() & (Qt::ControlModifier | Qt::AltModifier))) {  //### Add MetaModifier?
+                    bool res = false;
+                    if (k->key() == Qt::Key_Backtab
+                        || (k->key() == Qt::Key_Tab && (k->modifiers() & Qt::ShiftModifier))) {
+                        res = focusNextPrevChild(false);
+                    } else if (k->key() == Qt::Key_Tab) {
+                        res = focusNextPrevChild(true);
+                    }
+                    if (!res)
+                        event->ignore();
+                    return true;
+                }
+            }
+        }
+        keyPressEvent(static_cast<QKeyEvent *>(event));
+        break;
+    case QEvent::KeyRelease:
+        keyReleaseEvent(static_cast<QKeyEvent *>(event));
+        break;
+    case QEvent::ShortcutOverride: {
+            QGraphicsItem *parent = focusItem();
+            while (parent) {
+                d->sendEvent(parent, event);
+                if (event->isAccepted())
+                    return true;
+                parent = parent->parentItem();
+            }
+        }
+        return false;
+    case QEvent::GraphicsSceneMouseMove:
+        mouseMoveEvent(static_cast<QGraphicsSceneMouseEvent *>(event));
+        break;
+    case QEvent::GraphicsSceneMousePress:
+        mousePressEvent(static_cast<QGraphicsSceneMouseEvent *>(event));
+        break;
+    case QEvent::GraphicsSceneMouseRelease:
+        mouseReleaseEvent(static_cast<QGraphicsSceneMouseEvent *>(event));
+        break;
+    case QEvent::GraphicsSceneMouseDoubleClick:
+        mouseDoubleClickEvent(static_cast<QGraphicsSceneMouseEvent *>(event));
+        break;
+    case QEvent::GraphicsSceneWheel:
+        wheelEvent(static_cast<QGraphicsSceneWheelEvent *>(event));
+        break;
+    case QEvent::FocusIn:
+        focusInEvent(static_cast<QFocusEvent *>(event));
+        break;
+    case QEvent::FocusOut:
+        focusOutEvent(static_cast<QFocusEvent *>(event));
+        break;
+    case QEvent::GraphicsSceneHoverEnter:
+    case QEvent::GraphicsSceneHoverLeave:
+    case QEvent::GraphicsSceneHoverMove:
+        d->dispatchHoverEvent(static_cast<QGraphicsSceneHoverEvent *>(event));
+        break;
+    case QEvent::Leave:
+        d->leaveScene();
+        break;
+    case QEvent::GraphicsSceneHelp:
+        helpEvent(static_cast<QGraphicsSceneHelpEvent *>(event));
+        break;
+    case QEvent::InputMethod:
+        inputMethodEvent(static_cast<QInputMethodEvent *>(event));
+        break;
+    case QEvent::WindowActivate: {
+        if (!d->activationRefCount++) {
+            // Notify all non-window widgets.
+            foreach (QGraphicsItem *item, items()) {
+                if (item->isWidget() && item->isVisible() && !item->isWindow() && !item->parentWidget()) {
+                    QEvent event(QEvent::WindowActivate);
+                    QApplication::sendEvent(static_cast<QGraphicsWidget *>(item), &event);
+                }
+            }
+
+            // Restore window activation.
+            QGraphicsItem *nextFocusItem = d->focusItem ? d->focusItem : d->lastFocusItem;
+            if (nextFocusItem && nextFocusItem->window())
+                setActiveWindow(static_cast<QGraphicsWidget *>(nextFocusItem));
+            else if (d->tabFocusFirst && d->tabFocusFirst->isWindow())
+                setActiveWindow(d->tabFocusFirst);
+        }
+        break;
+    }
+    case QEvent::WindowDeactivate: {
+        if (!--d->activationRefCount) {
+            // Remove window activation.
+            setActiveWindow(0);
+
+            // Notify all non-window widgets.
+            foreach (QGraphicsItem *item, items()) {
+                if (item->isWidget() && item->isVisible() && !item->isWindow() && !item->parentWidget()) {
+                    QEvent event(QEvent::WindowDeactivate);
+                    QApplication::sendEvent(static_cast<QGraphicsWidget *>(item), &event);
+                }
+            }
+        }
+        break;
+    }
+    case QEvent::ApplicationFontChange: {
+        // Resolve the existing scene font.
+        d->resolveFont();
+        break;
+    }
+    case QEvent::FontChange:
+        // Update the entire scene when the font changes.
+        update();
+        break;
+    case QEvent::ApplicationPaletteChange: {
+        // Resolve the existing scene palette.
+        d->resolvePalette();
+        break;
+    }
+    case QEvent::PaletteChange:
+        // Update the entire scene when the palette changes.
+        update();
+        break;
+    case QEvent::StyleChange:
+        // Reresolve all widgets' styles. Update all top-level widgets'
+        // geometries that do not have an explicit style set.
+        update();
+        break;
+    case QEvent::Timer:
+        if (d->indexTimerId && static_cast<QTimerEvent *>(event)->timerId() == d->indexTimerId) {
+            if (d->restartIndexTimer) {
+                d->restartIndexTimer = false;
+            } else {
+                // this call will kill the timer
+                d->_q_updateIndex();
+            }
+        }
+        // Fallthrough intended - support timers in subclasses.
+    default:
+        return QObject::event(event);
+    }
+    return true;
+}
+
+/*!
+    \reimp
+
+    QGraphicsScene filters QApplication's events to detect palette and font
+    changes.
+*/
+bool QGraphicsScene::eventFilter(QObject *watched, QEvent *event)
+{
+    if (watched != qApp)
+        return false;
+
+    switch (event->type()) {
+    case QEvent::ApplicationPaletteChange:
+        qApp->postEvent(this, new QEvent(QEvent::ApplicationPaletteChange));
+        break;
+    case QEvent::ApplicationFontChange:
+        qApp->postEvent(this, new QEvent(QEvent::ApplicationFontChange));
+        break;
+    default:
+        break;
+    }
+    return false;
+}
+
+/*!
+    This event handler, for event \a contextMenuEvent, can be reimplemented in
+    a subclass to receive context menu events. The default implementation
+    forwards the event to the topmost item that accepts context menu events at
+    the position of the event. If no items accept context menu events at this
+    position, the event is ignored.
+
+    \sa QGraphicsItem::contextMenuEvent()
+*/
+void QGraphicsScene::contextMenuEvent(QGraphicsSceneContextMenuEvent *contextMenuEvent)
+{
+    Q_D(QGraphicsScene);
+    // Ignore by default.
+    contextMenuEvent->ignore();
+
+    // Send the event to all items at this position until one item accepts the
+    // event.
+    foreach (QGraphicsItem *item, d->itemsAtPosition(contextMenuEvent->screenPos(),
+                                                     contextMenuEvent->scenePos(),
+                                                     contextMenuEvent->widget())) {
+        contextMenuEvent->setPos(item->d_ptr->genericMapFromScene(contextMenuEvent->scenePos(),
+                                                                  contextMenuEvent->widget()));
+        contextMenuEvent->accept();
+        if (!d->sendEvent(item, contextMenuEvent))
+            break;
+
+        if (contextMenuEvent->isAccepted())
+            break;
+    }
+}
+
+/*!
+    This event handler, for event \a event, can be reimplemented in a subclass
+    to receive drag enter events for the scene.
+
+    The default implementation accepts the event and prepares the scene to
+    accept drag move events.
+
+    \sa QGraphicsItem::dragEnterEvent(), dragMoveEvent(), dragLeaveEvent(),
+    dropEvent()
+*/
+void QGraphicsScene::dragEnterEvent(QGraphicsSceneDragDropEvent *event)
+{
+    Q_D(QGraphicsScene);
+    d->dragDropItem = 0;
+    d->lastDropAction = Qt::IgnoreAction;
+    event->accept();
+}
+
+/*!
+    This event handler, for event \a event, can be reimplemented in a subclass
+    to receive drag move events for the scene.
+
+    \sa QGraphicsItem::dragMoveEvent(), dragEnterEvent(), dragLeaveEvent(),
+    dropEvent()
+*/
+void QGraphicsScene::dragMoveEvent(QGraphicsSceneDragDropEvent *event)
+{
+    Q_D(QGraphicsScene);
+    event->ignore();
+
+    if (!d->mouseGrabberItems.isEmpty()) {
+        // Mouse grabbers that start drag events lose the mouse grab.
+        d->clearMouseGrabber();
+        d->mouseGrabberButtonDownPos.clear();
+        d->mouseGrabberButtonDownScenePos.clear();
+        d->mouseGrabberButtonDownScreenPos.clear();
+    }
+
+    bool eventDelivered = false;
+
+    // Find the topmost enabled items under the cursor. They are all
+    // candidates for accepting drag & drop events.
+    foreach (QGraphicsItem *item, d->itemsAtPosition(event->screenPos(),
+                                                     event->scenePos(),
+                                                     event->widget())) {
+        if (!item->isEnabled() || !item->acceptDrops())
+            continue;
+
+        if (item != d->dragDropItem) {
+            // Enter the new drag drop item. If it accepts the event, we send
+            // the leave to the parent item.
+            QGraphicsSceneDragDropEvent dragEnter(QEvent::GraphicsSceneDragEnter);
+            d->cloneDragDropEvent(&dragEnter, event);
+            dragEnter.setDropAction(event->proposedAction());
+            d->sendDragDropEvent(item, &dragEnter);
+            event->setAccepted(dragEnter.isAccepted());
+            event->setDropAction(dragEnter.dropAction());
+            if (!event->isAccepted()) {
+                // Propagate to the item under
+                continue;
+            }
+
+            d->lastDropAction = event->dropAction();
+
+            if (d->dragDropItem) {
+                // Leave the last drag drop item. A perfect implementation
+                // would set the position of this event to the point where
+                // this event and the last event intersect with the item's
+                // shape, but that's not easy to do. :-)
+                QGraphicsSceneDragDropEvent dragLeave(QEvent::GraphicsSceneDragLeave);
+                d->cloneDragDropEvent(&dragLeave, event);
+                d->sendDragDropEvent(d->dragDropItem, &dragLeave);
+            }
+
+            // We've got a new drag & drop item
+            d->dragDropItem = item;
+        }
+
+        // Send the move event.
+        event->setDropAction(d->lastDropAction);
+        event->accept();
+        d->sendDragDropEvent(item, event);
+        if (event->isAccepted())
+            d->lastDropAction = event->dropAction();
+        eventDelivered = true;
+        break;
+    }
+
+    if (!eventDelivered) {
+        if (d->dragDropItem) {
+            // Leave the last drag drop item
+            QGraphicsSceneDragDropEvent dragLeave(QEvent::GraphicsSceneDragLeave);
+            d->cloneDragDropEvent(&dragLeave, event);
+            d->sendDragDropEvent(d->dragDropItem, &dragLeave);
+            d->dragDropItem = 0;
+        }
+        // Propagate
+        event->setDropAction(Qt::IgnoreAction);
+    }
+}
+
+/*!
+    This event handler, for event \a event, can be reimplemented in a subclass
+    to receive drag leave events for the scene.
+
+    \sa QGraphicsItem::dragLeaveEvent(), dragEnterEvent(), dragMoveEvent(),
+    dropEvent()
+*/
+void QGraphicsScene::dragLeaveEvent(QGraphicsSceneDragDropEvent *event)
+{
+    Q_D(QGraphicsScene);
+    if (d->dragDropItem) {
+        // Leave the last drag drop item
+        d->sendDragDropEvent(d->dragDropItem, event);
+        d->dragDropItem = 0;
+    }
+}
+
+/*!
+    This event handler, for event \a event, can be reimplemented in a subclass
+    to receive drop events for the scene.
+
+    \sa QGraphicsItem::dropEvent(), dragEnterEvent(), dragMoveEvent(),
+    dragLeaveEvent()
+*/
+void QGraphicsScene::dropEvent(QGraphicsSceneDragDropEvent *event)
+{
+    Q_UNUSED(event);
+    Q_D(QGraphicsScene);
+    if (d->dragDropItem) {
+        // Drop on the last drag drop item
+        d->sendDragDropEvent(d->dragDropItem, event);
+        d->dragDropItem = 0;
+    }
+}
+
+/*!
+    This event handler, for event \a focusEvent, can be reimplemented in a
+    subclass to receive focus in events.
+
+    The default implementation sets focus on the scene, and then on the last
+    focus item.
+
+    \sa QGraphicsItem::focusOutEvent()
+*/
+void QGraphicsScene::focusInEvent(QFocusEvent *focusEvent)
+{
+    Q_D(QGraphicsScene);
+
+    d->hasFocus = true;
+    switch (focusEvent->reason()) {
+    case Qt::TabFocusReason:
+        if (!focusNextPrevChild(true))
+            focusEvent->ignore();
+        break;
+    case Qt::BacktabFocusReason:
+        if (!focusNextPrevChild(false))
+            focusEvent->ignore();
+        break;
+    default:
+        if (d->lastFocusItem) {
+            // Set focus on the last focus item
+            setFocusItem(d->lastFocusItem, focusEvent->reason());
+        }
+        break;
+    }
+}
+
+/*!
+    This event handler, for event \a focusEvent, can be reimplemented in a
+    subclass to receive focus out events.
+
+    The default implementation removes focus from any focus item, then removes
+    focus from the scene.
+
+    \sa QGraphicsItem::focusInEvent()
+*/
+void QGraphicsScene::focusOutEvent(QFocusEvent *focusEvent)
+{
+    Q_D(QGraphicsScene);
+    d->hasFocus = false;
+    setFocusItem(0, focusEvent->reason());
+
+    // Remove all popups when the scene loses focus.
+    if (!d->popupWidgets.isEmpty())
+        d->removePopup(d->popupWidgets.first());
+}
+
+/*!
+    This event handler, for event \a helpEvent, can be
+    reimplemented in a subclass to receive help events. The events
+    are of type QEvent::ToolTip, which are created when a tooltip is
+    requested.
+
+    The default implementation shows the tooltip of the topmost
+    item, i.e., the item with the highest z-value, at the mouse
+    cursor position. If no item has a tooltip set, this function
+    does nothing.
+
+   \sa QGraphicsItem::toolTip(), QGraphicsSceneHelpEvent
+*/
+void QGraphicsScene::helpEvent(QGraphicsSceneHelpEvent *helpEvent)
+{
+#ifdef QT_NO_TOOLTIP
+    Q_UNUSED(helpEvent);
+#else
+    // Find the first item that does tooltips
+    Q_D(QGraphicsScene);
+    QList<QGraphicsItem *> itemsAtPos = d->itemsAtPosition(helpEvent->screenPos(),
+                                                           helpEvent->scenePos(),
+                                                           helpEvent->widget());
+    QGraphicsItem *toolTipItem = 0;
+    for (int i = 0; i < itemsAtPos.size(); ++i) {
+        QGraphicsItem *tmp = itemsAtPos.at(i);
+        if (!tmp->toolTip().isEmpty()) {
+            toolTipItem = tmp;
+            break;
+        }
+    }
+
+    // Show or hide the tooltip
+    QString text;
+    QPoint point;
+    if (toolTipItem && !toolTipItem->toolTip().isEmpty()) {
+        text = toolTipItem->toolTip();
+        point = helpEvent->screenPos();
+    }
+    QToolTip::showText(point, text);
+    helpEvent->setAccepted(!text.isEmpty());
+#endif
+}
+
+bool QGraphicsScenePrivate::itemAcceptsHoverEvents_helper(const QGraphicsItem *item) const
+{
+    return item->acceptHoverEvents()
+        || (item->isWidget() && static_cast<const QGraphicsWidget *>(item)->d_func()->hasDecoration());
+}
+
+/*!
+    This event handler, for event \a hoverEvent, can be reimplemented in a
+    subclass to receive hover enter events. The default implementation
+    forwards the event to the topmost item that accepts hover events at the
+    scene position from the event.
+
+    \sa QGraphicsItem::hoverEvent(), QGraphicsItem::setAcceptHoverEvents()
+*/
+bool QGraphicsScenePrivate::dispatchHoverEvent(QGraphicsSceneHoverEvent *hoverEvent)
+{
+    // Find the first item that accepts hover events, reusing earlier
+    // calculated data is possible.
+    if (cachedItemsUnderMouse.isEmpty()) {
+        cachedItemsUnderMouse = itemsAtPosition(hoverEvent->screenPos(),
+                                                hoverEvent->scenePos(),
+                                                hoverEvent->widget());
+    }
+
+    QGraphicsItem *item = 0;
+    for (int i = 0; i < cachedItemsUnderMouse.size(); ++i) {
+        QGraphicsItem *tmp = cachedItemsUnderMouse.at(i);
+        if (itemAcceptsHoverEvents_helper(tmp)) {
+            item = tmp;
+            break;
+        }
+    }
+
+    // Find the common ancestor item for the new topmost hoverItem and the
+    // last item in the hoverItem list.
+    QGraphicsItem *commonAncestorItem = (item && !hoverItems.isEmpty()) ? item->commonAncestorItem(hoverItems.last()) : 0;
+    while (commonAncestorItem && !itemAcceptsHoverEvents_helper(commonAncestorItem))
+        commonAncestorItem = commonAncestorItem->parentItem();
+    if (commonAncestorItem && commonAncestorItem->window() != item->window()) {
+        // The common ancestor isn't in the same window as the two hovered
+        // items.
+        commonAncestorItem = 0;
+    }
+
+    // Check if the common ancestor item is known.
+    int index = commonAncestorItem ? hoverItems.indexOf(commonAncestorItem) : -1;
+    // Send hover leaves to any existing hovered children of the common
+    // ancestor item.
+    for (int i = hoverItems.size() - 1; i > index; --i) {
+        QGraphicsItem *lastItem = hoverItems.takeLast();
+        if (itemAcceptsHoverEvents_helper(lastItem))
+            sendHoverEvent(QEvent::GraphicsSceneHoverLeave, lastItem, hoverEvent);
+    }
+
+    // Item is a child of a known item. Generate enter events for the
+    // missing links.
+    QList<QGraphicsItem *> parents;
+    QGraphicsItem *parent = item;
+    while (parent && parent != commonAncestorItem) {
+        parents.prepend(parent);
+        if (parent->isWindow()) {
+            // Stop at the window - we don't deliver beyond this point.
+            break;
+        }
+        parent = parent->parentItem();
+    }
+    for (int i = 0; i < parents.size(); ++i) {
+        parent = parents.at(i);
+        hoverItems << parent;
+        if (itemAcceptsHoverEvents_helper(parent))
+            sendHoverEvent(QEvent::GraphicsSceneHoverEnter, parent, hoverEvent);
+    }
+
+    // Generate a move event for the item itself
+    if (item && !hoverItems.isEmpty() && item == hoverItems.last()) {
+        sendHoverEvent(QEvent::GraphicsSceneHoverMove, item, hoverEvent);
+        return true;
+    }
+    return false;
+}
+
+/*!
+    \internal
+
+    Handles all actions necessary to clean up the scene when the mouse leaves
+    the view.
+*/
+void QGraphicsScenePrivate::leaveScene()
+{
+    Q_Q(QGraphicsScene);
+#ifndef QT_NO_TOOLTIP
+    // Remove any tooltips
+    QToolTip::showText(QPoint(), QString());
+#endif
+    // Send HoverLeave events to all existing hover items, topmost first.
+    QGraphicsView *senderWidget = qobject_cast<QGraphicsView *>(q->sender());
+    QGraphicsSceneHoverEvent hoverEvent;
+    hoverEvent.setWidget(senderWidget);
+
+    if (senderWidget) {
+        QPoint cursorPos = QCursor::pos();
+        hoverEvent.setScenePos(senderWidget->mapToScene(senderWidget->mapFromGlobal(cursorPos)));
+        hoverEvent.setLastScenePos(hoverEvent.scenePos());
+        hoverEvent.setScreenPos(cursorPos);
+        hoverEvent.setLastScreenPos(hoverEvent.screenPos());
+    }
+
+    while (!hoverItems.isEmpty()) {
+        QGraphicsItem *lastItem = hoverItems.takeLast();
+        if (lastItem->acceptHoverEvents()
+            || (lastItem->isWidget() && static_cast<QGraphicsWidget*>(lastItem)->d_func()->hasDecoration()))
+            sendHoverEvent(QEvent::GraphicsSceneHoverLeave, lastItem, &hoverEvent);
+    }
+}
+
+/*!
+    This event handler, for event \a keyEvent, can be reimplemented in a
+    subclass to receive keypress events. The default implementation forwards
+    the event to current focus item.
+
+    \sa QGraphicsItem::keyPressEvent(), focusItem()
+*/
+void QGraphicsScene::keyPressEvent(QKeyEvent *keyEvent)
+{
+    // ### Merge this function with keyReleaseEvent; they are identical
+    // ### (except this comment).
+    Q_D(QGraphicsScene);
+    QGraphicsItem *item = !d->keyboardGrabberItems.isEmpty() ? d->keyboardGrabberItems.last() : 0;
+    if (!item)
+        item = focusItem();
+    if (item) {
+        QGraphicsItem *p = item;
+        do {
+            // Accept the event by default
+            keyEvent->accept();
+            // Send it; QGraphicsItem::keyPressEvent ignores it.  If the event
+            // is filtered out, stop propagating it.
+            if (!d->sendEvent(p, keyEvent))
+                break;
+        } while (!keyEvent->isAccepted() && !p->isWindow() && (p = p->parentItem()));
+    } else {
+        keyEvent->ignore();
+    }
+}
+
+/*!
+    This event handler, for event \a keyEvent, can be reimplemented in a
+    subclass to receive key release events. The default implementation
+    forwards the event to current focus item.
+
+    \sa QGraphicsItem::keyReleaseEvent(), focusItem()
+*/
+void QGraphicsScene::keyReleaseEvent(QKeyEvent *keyEvent)
+{
+    // ### Merge this function with keyPressEvent; they are identical (except
+    // ### this comment).
+    Q_D(QGraphicsScene);
+    QGraphicsItem *item = !d->keyboardGrabberItems.isEmpty() ? d->keyboardGrabberItems.last() : 0;
+    if (!item)
+        item = focusItem();
+    if (item) {
+        QGraphicsItem *p = item;
+        do {
+            // Accept the event by default
+            keyEvent->accept();
+            // Send it; QGraphicsItem::keyPressEvent ignores it.  If the event
+            // is filtered out, stop propagating it.
+            if (!d->sendEvent(p, keyEvent))
+                break;
+        } while (!keyEvent->isAccepted() && !p->isWindow() && (p = p->parentItem()));
+    } else {
+        keyEvent->ignore();
+    }
+}
+
+/*!
+    This event handler, for event \a mouseEvent, can be reimplemented
+    in a subclass to receive mouse press events for the scene.
+
+    The default implementation depends on the state of the scene. If
+    there is a mouse grabber item, then the event is sent to the mouse
+    grabber. Otherwise, it is forwarded to the topmost item that
+    accepts mouse events at the scene position from the event, and
+    that item promptly becomes the mouse grabber item.
+
+    If there is no item at the given position on the scene, the
+    selection area is reset, any focus item loses its input focus, and
+    the event is then ignored.
+
+    \sa QGraphicsItem::mousePressEvent(),
+    QGraphicsItem::setAcceptedMouseButtons()
+*/
+void QGraphicsScene::mousePressEvent(QGraphicsSceneMouseEvent *mouseEvent)
+{
+    Q_D(QGraphicsScene);
+    d->mousePressEventHandler(mouseEvent);
+}
+
+/*!
+    This event handler, for event \a mouseEvent, can be reimplemented
+    in a subclass to receive mouse move events for the scene.
+
+    The default implementation depends on the mouse grabber state. If there is
+    a mouse grabber item, the event is sent to the mouse grabber.  If there
+    are any items that accept hover events at the current position, the event
+    is translated into a hover event and accepted; otherwise it's ignored.
+
+    \sa QGraphicsItem::mousePressEvent(), QGraphicsItem::mouseReleaseEvent(),
+    QGraphicsItem::mouseDoubleClickEvent(), QGraphicsItem::setAcceptedMouseButtons()
+*/
+void QGraphicsScene::mouseMoveEvent(QGraphicsSceneMouseEvent *mouseEvent)
+{
+    Q_D(QGraphicsScene);
+    if (d->mouseGrabberItems.isEmpty()) {
+        if (mouseEvent->buttons())
+            return;
+        QGraphicsSceneHoverEvent hover;
+        _q_hoverFromMouseEvent(&hover, mouseEvent);
+        mouseEvent->setAccepted(d->dispatchHoverEvent(&hover));
+        return;
+    }
+
+    // Forward the event to the mouse grabber
+    d->sendMouseEvent(mouseEvent);
+    mouseEvent->accept();
+}
+
+/*!
+    This event handler, for event \a mouseEvent, can be reimplemented
+    in a subclass to receive mouse release events for the scene.
+
+    The default implementation depends on the mouse grabber state.  If
+    there is no mouse grabber, the event is ignored.  Otherwise, if
+    there is a mouse grabber item, the event is sent to the mouse
+    grabber. If this mouse release represents the last pressed button
+    on the mouse, the mouse grabber item then loses the mouse grab.
+
+    \sa QGraphicsItem::mousePressEvent(), QGraphicsItem::mouseMoveEvent(),
+    QGraphicsItem::mouseDoubleClickEvent(), QGraphicsItem::setAcceptedMouseButtons()
+*/
+void QGraphicsScene::mouseReleaseEvent(QGraphicsSceneMouseEvent *mouseEvent)
+{
+    Q_D(QGraphicsScene);
+    if (d->mouseGrabberItems.isEmpty()) {
+        mouseEvent->ignore();
+        return;
+    }
+
+    // Forward the event to the mouse grabber
+    d->sendMouseEvent(mouseEvent);
+    mouseEvent->accept();
+
+    // Reset the mouse grabber when the last mouse button has been released.
+    if (!mouseEvent->buttons()) {
+        if (!d->mouseGrabberItems.isEmpty()) {
+            d->lastMouseGrabberItem = d->mouseGrabberItems.last();
+            if (d->lastMouseGrabberItemHasImplicitMouseGrab)
+                d->mouseGrabberItems.last()->ungrabMouse();
+        } else {
+            d->lastMouseGrabberItem = 0;
+        }
+
+        // Generate a hoverevent
+        QGraphicsSceneHoverEvent hoverEvent;
+        _q_hoverFromMouseEvent(&hoverEvent, mouseEvent);
+        d->dispatchHoverEvent(&hoverEvent);
+    }
+}
+
+/*!
+    This event handler, for event \a mouseEvent, can be reimplemented
+    in a subclass to receive mouse doubleclick events for the scene.
+
+    If someone doubleclicks on the scene, the scene will first receive
+    a mouse press event, followed by a release event (i.e., a click),
+    then a doubleclick event, and finally a release event. If the
+    doubleclick event is delivered to a different item than the one
+    that received the first press and release, it will be delivered as
+    a press event. However, tripleclick events are not delivered as
+    doubleclick events in this case.
+
+    The default implementation is similar to mousePressEvent().
+
+    \sa QGraphicsItem::mousePressEvent(), QGraphicsItem::mouseMoveEvent(),
+    QGraphicsItem::mouseReleaseEvent(), QGraphicsItem::setAcceptedMouseButtons()
+*/
+void QGraphicsScene::mouseDoubleClickEvent(QGraphicsSceneMouseEvent *mouseEvent)
+{
+    Q_D(QGraphicsScene);
+    d->mousePressEventHandler(mouseEvent);
+}
+
+/*!
+    This event handler, for event \a wheelEvent, can be reimplemented in a
+    subclass to receive mouse wheel events for the scene.
+
+    By default, the event is delivered to the topmost visible item under the
+    cursor. If ignored, the event propagates to the item beneath, and again
+    until the event is accepted, or it reaches the scene. If no items accept
+    the event, it is ignored.
+
+    \sa QGraphicsItem::wheelEvent()
+*/
+void QGraphicsScene::wheelEvent(QGraphicsSceneWheelEvent *wheelEvent)
+{
+    Q_D(QGraphicsScene);
+    QList<QGraphicsItem *> wheelCandidates = d->itemsAtPosition(wheelEvent->screenPos(),
+                                                                wheelEvent->scenePos(),
+                                                                wheelEvent->widget());
+
+    bool hasSetFocus = false;
+    foreach (QGraphicsItem *item, wheelCandidates) {
+        if (!hasSetFocus && item->isEnabled() && (item->flags() & QGraphicsItem::ItemIsFocusable)) {
+            if (item->isWidget() && static_cast<QGraphicsWidget *>(item)->focusPolicy() == Qt::WheelFocus) {
+                hasSetFocus = true;
+                if (item != focusItem())
+                    setFocusItem(item, Qt::MouseFocusReason);
+            }
+        }
+
+        wheelEvent->setPos(item->d_ptr->genericMapFromScene(wheelEvent->scenePos(),
+                                                            wheelEvent->widget()));
+        wheelEvent->accept();
+        bool isWindow = item->isWindow();
+        d->sendEvent(item, wheelEvent);
+        if (isWindow || wheelEvent->isAccepted())
+            break;
+    }
+}
+
+/*!
+    This event handler, for event \a event, can be reimplemented in a
+    subclass to receive input method events for the scene.
+
+    The default implementation forwards the event to the focusItem().
+    If no item currently has focus, this function does nothing.
+
+    \sa QGraphicsItem::inputMethodEvent()
+*/
+void QGraphicsScene::inputMethodEvent(QInputMethodEvent *event)
+{
+    Q_D(QGraphicsScene);
+    if (!d->focusItem)
+        return;
+    d->sendEvent(d->focusItem, event);
+}
+
+/*!
+    Draws the background of the scene using \a painter, before any items and
+    the foreground are drawn. Reimplement this function to provide a custom
+    background for the scene.
+
+    All painting is done in \e scene coordinates. The \a rect
+    parameter is the exposed rectangle.
+
+    If all you want is to define a color, texture, or gradient for the
+    background, you can call setBackgroundBrush() instead.
+
+    \sa drawForeground(), drawItems()
+*/
+void QGraphicsScene::drawBackground(QPainter *painter, const QRectF &rect)
+{
+    Q_D(QGraphicsScene);
+
+    if (d->backgroundBrush.style() != Qt::NoBrush) {
+        if (d->painterStateProtection)
+            painter->save();
+        painter->setBrushOrigin(0, 0);
+        painter->fillRect(rect, backgroundBrush());
+        if (d->painterStateProtection)
+            painter->restore();
+    }
+}
+
+/*!
+    Draws the foreground of the scene using \a painter, after the background
+    and all items have been drawn. Reimplement this function to provide a
+    custom foreground for the scene.
+
+    All painting is done in \e scene coordinates. The \a rect
+    parameter is the exposed rectangle.
+
+    If all you want is to define a color, texture or gradient for the
+    foreground, you can call setForegroundBrush() instead.
+
+    \sa drawBackground(), drawItems()
+*/
+void QGraphicsScene::drawForeground(QPainter *painter, const QRectF &rect)
+{
+    Q_D(QGraphicsScene);
+
+    if (d->foregroundBrush.style() != Qt::NoBrush) {
+        if (d->painterStateProtection)
+            painter->save();
+        painter->setBrushOrigin(0, 0);
+        painter->fillRect(rect, foregroundBrush());
+        if (d->painterStateProtection)
+            painter->restore();
+    }
+}
+
+static void _q_paintItem(QGraphicsItem *item, QPainter *painter,
+                         const QStyleOptionGraphicsItem *option, QWidget *widget,
+                         bool useWindowOpacity, bool painterStateProtection)
+{
+    if (!item->isWidget()) {
+        item->paint(painter, option, widget);
+        return;
+    }
+    QGraphicsWidget *widgetItem = static_cast<QGraphicsWidget *>(item);
+    QGraphicsProxyWidget *proxy = qobject_cast<QGraphicsProxyWidget *>(widgetItem);
+    const qreal windowOpacity = (proxy && proxy->widget() && useWindowOpacity)
+                                ? proxy->widget()->windowOpacity() : 1.0;
+    const qreal oldPainterOpacity = painter->opacity();
+
+    if (qFuzzyCompare(windowOpacity + 1, qreal(1.0)))
+        return;
+    // Set new painter opacity.
+    if (windowOpacity < 1.0)
+        painter->setOpacity(oldPainterOpacity * windowOpacity);
+
+    // set layoutdirection on the painter
+    Qt::LayoutDirection oldLayoutDirection = painter->layoutDirection();
+    painter->setLayoutDirection(widgetItem->layoutDirection());
+
+    if (widgetItem->isWindow() && widgetItem->windowType() != Qt::Popup && widgetItem->windowType() != Qt::ToolTip
+        && !(widgetItem->windowFlags() & Qt::FramelessWindowHint)) {
+        if (painterStateProtection)
+            painter->save();
+        widgetItem->paintWindowFrame(painter, option, widget);
+        if (painterStateProtection)
+            painter->restore();
+    }
+
+    widgetItem->paint(painter, option, widget);
+
+    // Restore layoutdirection on the painter.
+    painter->setLayoutDirection(oldLayoutDirection);
+    // Restore painter opacity.
+    if (windowOpacity < 1.0)
+        painter->setOpacity(oldPainterOpacity);
+}
+
+static void _q_paintIntoCache(QPixmap *pix, QGraphicsItem *item, const QRegion &pixmapExposed,
+                              const QTransform &itemToPixmap, QPainter::RenderHints renderHints,
+                              const QStyleOptionGraphicsItem *option, bool painterStateProtection)
+{
+    QPixmap subPix;
+    QPainter pixmapPainter;
+    QRect br = pixmapExposed.boundingRect();
+
+    // Don't use subpixmap if we get a full update.
+    if (pixmapExposed.isEmpty() || (pixmapExposed.numRects() == 1 && br.contains(pix->rect()))) {
+        pix->fill(Qt::transparent);
+        pixmapPainter.begin(pix);
+    } else {
+        subPix = QPixmap(br.size());
+        subPix.fill(Qt::transparent);
+        pixmapPainter.begin(&subPix);
+        pixmapPainter.translate(-br.topLeft());
+        if (!pixmapExposed.isEmpty()) {
+            // Applied to subPix; paint is adjusted to the coordinate space is
+            // correct.
+            pixmapPainter.setClipRegion(pixmapExposed);
+        }
+    }
+
+    pixmapPainter.setRenderHints(pixmapPainter.renderHints(), false);
+    pixmapPainter.setRenderHints(renderHints, true);
+    pixmapPainter.setWorldTransform(itemToPixmap, true);
+
+    // Render.
+    _q_paintItem(item, &pixmapPainter, option, 0, false, painterStateProtection);
+    pixmapPainter.end();
+
+    if (!subPix.isNull()) {
+        // Blit the subpixmap into the main pixmap.
+        pixmapPainter.begin(pix);
+        pixmapPainter.setCompositionMode(QPainter::CompositionMode_Source);
+        pixmapPainter.setClipRegion(pixmapExposed);
+        pixmapPainter.drawPixmap(br.topLeft(), subPix);
+        pixmapPainter.end();
+    }
+}
+
+/*!
+    \internal
+
+    Draws items directly, or using cache.
+*/
+void QGraphicsScenePrivate::drawItemHelper(QGraphicsItem *item, QPainter *painter,
+                                           const QStyleOptionGraphicsItem *option, QWidget *widget,
+                                           bool painterStateProtection)
+{
+    QGraphicsItemPrivate *itemd = item->d_ptr;
+    QGraphicsItem::CacheMode cacheMode = QGraphicsItem::CacheMode(itemd->cacheMode);
+
+    // Render directly, using no cache.
+    if (cacheMode == QGraphicsItem::NoCache
+#ifdef Q_WS_X11
+        || !X11->use_xrender
+#endif
+        ) {
+        _q_paintItem(static_cast<QGraphicsWidget *>(item), painter, option, widget, true, painterStateProtection);
+        return;
+    }
+
+    const qreal oldPainterOpacity = painter->opacity();
+    qreal newPainterOpacity = oldPainterOpacity;
+    QGraphicsProxyWidget *proxy = item->isWidget() ? qobject_cast<QGraphicsProxyWidget *>(static_cast<QGraphicsWidget *>(item)) : 0;
+    if (proxy && proxy->widget()) {
+        const qreal windowOpacity = proxy->widget()->windowOpacity();
+        if (windowOpacity < 1.0)
+            newPainterOpacity *= windowOpacity;
+    }
+
+    // Item's (local) bounding rect
+    QRectF brect = item->boundingRect();
+    if (_q_adjustedRect(brect).isEmpty())
+        return;
+
+    // Fetch the off-screen transparent buffer and exposed area info.
+    QString pixmapKey;
+    QPixmap pix;
+    QGraphicsItemCache *itemCache = itemd->extraItemCache();
+    if (cacheMode == QGraphicsItem::ItemCoordinateCache) {
+        if (itemCache->boundingRect != brect.toRect()) {
+            itemCache->boundingRect = brect.toRect();
+            itemCache->allExposed = true;
+            itemCache->exposed.clear();
+        }
+        pixmapKey = itemCache->key;
+    } else {
+        if ((pixmapKey = itemCache->deviceData.value(widget).key).isEmpty()) {
+            pixmapKey.sprintf("qgv-%p-%p", item, widget);
+            QGraphicsItemCache::DeviceData data;
+            data.key = pixmapKey;
+            itemCache->deviceData.insert(widget, data);
+        }
+    }
+
+    // Find pixmap in cache.
+    if (!itemCache->allExposed)
+        QPixmapCache::find(pixmapKey, pix);
+
+    // Render using item coordinate cache mode.
+    if (cacheMode == QGraphicsItem::ItemCoordinateCache) {
+        QSize pixmapSize;
+        bool fixedCacheSize = false;
+        if ((fixedCacheSize = itemCache->fixedSize.isValid())) {
+            pixmapSize = itemCache->fixedSize;
+        } else {
+            pixmapSize = brect.toAlignedRect().size();
+        }
+
+        // Create or recreate the pixmap.
+        int adjust = itemCache->fixedSize.isValid() ? 0 : 2;
+        QSize adjustSize(adjust*2, adjust*2);
+        QRectF br = brect.adjusted(-adjust, -adjust, adjust, adjust);
+        if (pix.isNull() || (!fixedCacheSize && (pixmapSize + adjustSize) != pix.size())) {
+            pix = QPixmap(pixmapSize + adjustSize);
+            itemCache->exposed.clear();
+            itemCache->allExposed = true;
+        }
+
+        // Redraw any newly exposed areas.
+        if (itemCache->allExposed || !itemCache->exposed.isEmpty()) {
+            // Fit the item's bounding rect into the pixmap's coordinates.
+            const QPointF scale(pixmapSize.width() / brect.width(), pixmapSize.height() / brect.height());
+            QTransform itemToPixmap;
+            itemToPixmap.scale(scale.x(), scale.y());
+            itemToPixmap.translate(-br.x(), -br.y());
+
+            // Generate the item's exposedRect and map its list of expose
+            // rects to device coordinates.
+            QStyleOptionGraphicsItem cacheOption = *option;
+            QRegion pixmapExposed;
+            QRectF exposedRect;
+            if (!itemCache->allExposed) {
+                for (int i = 0; i < itemCache->exposed.size(); ++i) {
+                    QRectF r = itemCache->exposed.at(i);
+                    exposedRect |= r;
+                    pixmapExposed += itemToPixmap.mapRect(r).toAlignedRect();
+                }
+            } else {
+                exposedRect = brect;
+            }
+            cacheOption.exposedRect = exposedRect;
+
+            // Render.
+            _q_paintIntoCache(&pix, item, pixmapExposed, itemToPixmap, painter->renderHints(),
+                              &cacheOption, painterStateProtection);
+
+            // Reinsert this pixmap into the cache.
+            QPixmapCache::insert(pixmapKey, pix);
+
+            // Reset expose data.
+            itemCache->allExposed = false;
+            itemCache->exposed.clear();
+        }
+
+        // Redraw the exposed area using the transformed painter. Depending on
+        // the hardware, this may be a server-side operation, or an expensive
+        // qpixmap-image-transform-pixmap roundtrip.
+        if (newPainterOpacity != oldPainterOpacity) {
+            painter->setOpacity(newPainterOpacity);
+            painter->drawPixmap(br, pix, QRectF(QPointF(), pix.size()));
+            painter->setOpacity(oldPainterOpacity);
+        } else {
+            painter->drawPixmap(br, pix, QRectF(QPointF(), pix.size()));
+        }
+        return;
+    }
+
+    // Render using device coordinate cache mode.
+    if (cacheMode == QGraphicsItem::DeviceCoordinateCache) {
+        // Find the item's bounds in device coordinates.
+        QRectF deviceBounds = painter->worldTransform().mapRect(brect);
+        QRect deviceRect = deviceBounds.toRect().adjusted(-1, -1, 1, 1);
+        if (deviceRect.isEmpty())
+            return;
+        QRect viewRect = widget ? widget->rect() : QRect();
+        if (widget && !viewRect.intersects(deviceRect))
+            return;
+
+        // Resort to direct rendering if the device rect exceeds the
+        // (optional) maximum bounds. (QGraphicsSvgItem uses this).
+        QSize maximumCacheSize =
+            itemd->extra(QGraphicsItemPrivate::ExtraMaxDeviceCoordCacheSize).toSize();
+        if (!maximumCacheSize.isEmpty()
+            && (deviceRect.width() > maximumCacheSize.width()
+                || deviceRect.height() > maximumCacheSize.height())) {
+            _q_paintItem(static_cast<QGraphicsWidget *>(item), painter, option, widget,
+                         oldPainterOpacity != newPainterOpacity, painterStateProtection);
+            return;
+        }
+
+        // Create or reuse offscreen pixmap, possibly scroll/blit from the old one.
+        bool pixModified = false;
+        QGraphicsItemCache::DeviceData *deviceData = &itemCache->deviceData[widget];
+        bool invertable = true;
+        QTransform diff = deviceData->lastTransform.inverted(&invertable);
+        if (invertable)
+            diff *= painter->worldTransform();
+        deviceData->lastTransform = painter->worldTransform();
+        if (!invertable || diff.type() > QTransform::TxTranslate) {
+            pixModified = true;
+            itemCache->allExposed = true;
+            itemCache->exposed.clear();
+            pix = QPixmap();
+        }
+
+        // ### This is a pretty bad way to determine when to start partial
+        // exposure for DeviceCoordinateCache but it's the least intrusive
+        // approach for now.
+#if 0
+        // Only if the device rect isn't fully contained.
+        bool allowPartialCacheExposure = !viewRect.contains(deviceRect);
+#else
+        // Only if deviceRect is 20% taller or wider than the desktop.
+        QRect desktopRect = qApp->desktop()->availableGeometry(widget);
+        bool allowPartialCacheExposure = (desktopRect.width() * 1.2 < deviceRect.width()
+                                          || desktopRect.height() * 1.2 < deviceRect.height());
+#endif
+        QRegion scrollExposure;
+        if (deviceData->cacheIndent != QPoint() || allowPartialCacheExposure) {
+            // Part of pixmap is drawn. Either device contains viewrect (big
+            // item covers whole screen) or parts of device are outside the
+            // viewport. In either case the device rect must be the intersect
+            // between the two.
+            int dx = deviceRect.left() < viewRect.left() ? viewRect.left() - deviceRect.left() : 0;
+            int dy = deviceRect.top() < viewRect.top() ? viewRect.top() - deviceRect.top() : 0;
+            QPoint newCacheIndent(dx, dy);
+            deviceRect &= viewRect;
+
+            if (pix.isNull()) {
+                deviceData->cacheIndent = QPoint();
+                itemCache->allExposed = true;
+                itemCache->exposed.clear();
+                pixModified = true;
+            }
+
+            // Copy / "scroll" the old pixmap onto the new ole and calculate
+            // scrolled exposure.
+            if (newCacheIndent != deviceData->cacheIndent || deviceRect.size() != pix.size()) {
+                QPoint diff = newCacheIndent - deviceData->cacheIndent;
+                QPixmap newPix(deviceRect.size());
+                // ### Investigate removing this fill (test with Plasma and
+                // graphicssystem raster).
+                newPix.fill(Qt::transparent);
+                if (!pix.isNull()) {
+                    QPainter newPixPainter(&newPix);
+                    newPixPainter.drawPixmap(-diff, pix);
+                    newPixPainter.end();
+                }
+                QRegion exposed;
+                exposed += newPix.rect();
+                if (!pix.isNull())
+                    exposed -= QRect(-diff, pix.size());
+                scrollExposure = exposed;
+
+                pix = newPix;
+                pixModified = true;
+            }
+            deviceData->cacheIndent = newCacheIndent;
+        } else {
+            // Full pixmap is drawn.
+            deviceData->cacheIndent = QPoint();
+
+            // Auto-adjust the pixmap size.
+            if (deviceRect.size() != pix.size()) {
+                // exposed needs to cover the whole pixmap
+                pix = QPixmap(deviceRect.size());
+                pixModified = true;
+                itemCache->allExposed = true;
+                itemCache->exposed.clear();
+            }
+        }
+
+        // Check for newly invalidated areas.
+        if (itemCache->allExposed || !itemCache->exposed.isEmpty() || !scrollExposure.isEmpty()) {
+            // Construct an item-to-pixmap transform.
+            QPointF p = deviceRect.topLeft();
+            QTransform itemToPixmap = QTransform::fromTranslate(-p.x(), -p.y());
+            itemToPixmap = painter->worldTransform() * itemToPixmap;
+
+            // Map the item's logical expose to pixmap coordinates.
+            QRegion pixmapExposed = scrollExposure;
+            if (!itemCache->allExposed) {
+                const QVector<QRectF> &exposed = itemCache->exposed;
+                for (int i = 0; i < exposed.size(); ++i)
+                    pixmapExposed += itemToPixmap.mapRect(exposed.at(i)).toRect().adjusted(-1, -1, 1, 1);
+            }
+
+            // Calculate the style option's exposedRect.
+            QRectF br;
+            if (itemCache->allExposed) {
+                br = item->boundingRect();
+            } else {
+                const QVector<QRectF> &exposed = itemCache->exposed;
+                for (int i = 0; i < exposed.size(); ++i)
+                    br |= exposed.at(i);
+                QTransform pixmapToItem = itemToPixmap.inverted();
+                foreach (QRect r, scrollExposure.rects())
+                    br |= pixmapToItem.mapRect(r);
+            }
+            QStyleOptionGraphicsItem cacheOption = *option;
+            cacheOption.exposedRect = br.adjusted(-1, -1, 1, 1);
+
+            // Render the exposed areas.
+            _q_paintIntoCache(&pix, item, pixmapExposed, itemToPixmap, painter->renderHints(),
+                              &cacheOption, painterStateProtection);
+
+            // Reset expose data.
+            pixModified = true;
+            itemCache->allExposed = false;
+            itemCache->exposed.clear();
+        }
+
+        if (pixModified) {
+            // Reinsert this pixmap into the cache
+            QPixmapCache::insert(pixmapKey, pix);
+        }
+
+        // Redraw the exposed area using an untransformed painter. This
+        // effectively becomes a bitblit that does not transform the cache.
+        QTransform restoreTransform = painter->worldTransform();
+        painter->setWorldTransform(QTransform());
+        if (newPainterOpacity != oldPainterOpacity) {
+            painter->setOpacity(newPainterOpacity);
+            painter->drawPixmap(deviceRect.topLeft(), pix);
+            painter->setOpacity(oldPainterOpacity);
+        } else {
+            painter->drawPixmap(deviceRect.topLeft(), pix);
+        }
+        painter->setWorldTransform(restoreTransform);
+        return;
+    }
+}
+
+/*!
+    Paints the given \a items using the provided \a painter, after the
+    background has been drawn, and before the foreground has been
+    drawn.  All painting is done in \e scene coordinates. Before
+    drawing each item, the painter must be transformed using
+    QGraphicsItem::sceneMatrix().
+
+    The \a options parameter is the list of style option objects for
+    each item in \a items. The \a numItems parameter is the number of
+    items in \a items and options in \a options. The \a widget
+    parameter is optional; if specified, it should point to the widget
+    that is being painted on.
+
+    The default implementation prepares the painter matrix, and calls
+    QGraphicsItem::paint() on all items. Reimplement this function to
+    provide custom painting of all items for the scene; gaining
+    complete control over how each item is drawn. In some cases this
+    can increase drawing performance significantly.
+
+    Example:
+
+    \snippet doc/src/snippets/graphicssceneadditemsnippet.cpp 0
+
+    \sa drawBackground(), drawForeground()
+*/
+void QGraphicsScene::drawItems(QPainter *painter,
+                               int numItems,
+                               QGraphicsItem *items[],
+                               const QStyleOptionGraphicsItem options[], QWidget *widget)
+{
+    Q_D(QGraphicsScene);
+
+    // Detect if painter state protection is disabled.
+    QTransform viewTransform = painter->worldTransform();
+    QVarLengthArray<QGraphicsItem *, 16> childClippers;
+
+    for (int i = 0; i < numItems; ++i) {
+        QGraphicsItem *item = items[i];
+        if (!(item->d_ptr->ancestorFlags & QGraphicsItemPrivate::AncestorClipsChildren)) {
+            if (!childClippers.isEmpty()) {
+                // Item is not clipped to any ancestor: pop all current clippers.
+                for (int i = 0; i < childClippers.size(); ++i)
+                    painter->restore();
+                childClippers.clear();
+            }
+        } else {
+            // Item is clipped to an ancestor, which may or may not be in our
+            // child clipper list. Let's start by finding the item's closest
+            // clipping ancestor.
+            QGraphicsItem *clipParent = item->parentItem();
+            while (clipParent && !(clipParent->d_ptr->flags & QGraphicsItem::ItemClipsChildrenToShape))
+                clipParent = clipParent->parentItem();
+
+            // Pop any in-between clippers. If the clipper is unknown, pop
+            // them all.  ### QVarLengthArray::lastIndexOf().
+            int index = -1;
+            for (int n = childClippers.size() - 1; n >= 0; --n) {
+                if (childClippers[n] == clipParent) {
+                    index = n;
+                    break;
+                }
+            }
+            if (index != -1) {
+                int toPop = childClippers.size() - index - 1;
+                if (toPop > 0) {
+                    for (int i = 0; i < toPop; ++i)
+                        painter->restore();
+                    childClippers.resize(index + 1);
+                }
+            }
+
+            // Sanity check
+            if (!childClippers.isEmpty())
+                Q_ASSERT(childClippers[childClippers.size() - 1] == clipParent);
+
+            // If the clipper list is empty at this point, but we're still
+            // clipped to an ancestor, then we need to build the clip chain
+            // ourselves. There is only one case that can produce this issue:
+            // This item is stacked behind an ancestor:
+            // ItemStacksBehindParent.
+            if (childClippers.isEmpty()) {
+                Q_ASSERT(clipParent != 0);
+                // Build a stack of clippers.
+                QVarLengthArray<QGraphicsItem *, 16> clippers;
+                QGraphicsItem *p = clipParent;
+                do {
+                    if (p->d_ptr->flags & QGraphicsItem::ItemClipsChildrenToShape)
+                        clippers.append(p);
+                } while ((p = p->parentItem()) && (p->d_ptr->ancestorFlags & QGraphicsItemPrivate::AncestorClipsChildren));
+
+                // ### This code path can also use the itemTransform
+                // optimization, but it's hit very rarely.
+                for (int i = clippers.size() - 1; i >= 0; --i) {
+                    QGraphicsItem *clipper = clippers[i];
+                    if (clipper->d_ptr->itemIsUntransformable()) {
+                        painter->setWorldTransform(clipper->deviceTransform(viewTransform), false);
+                    } else {
+                        painter->setWorldTransform(clipper->sceneTransform() * viewTransform, false);
+                    }
+
+                    childClippers.append(clipper);
+                    painter->save();
+                    painter->setClipPath(clipper->shape(), Qt::IntersectClip);
+                }
+                Q_ASSERT(childClippers[childClippers.size() - 1] == clipParent);
+            }
+        }
+
+        // Set up the painter transform
+        if (item->d_ptr->itemIsUntransformable()) {
+            painter->setWorldTransform(item->deviceTransform(viewTransform), false);
+        } else {
+            painter->setWorldTransform(item->sceneTransform() * viewTransform, false);
+        }
+       
+        // Save painter
+        bool saveState = (d->painterStateProtection || (item->flags() & QGraphicsItem::ItemClipsToShape));
+        if (saveState)
+            painter->save();
+
+        // Set local clip
+        if (item->flags() & QGraphicsItem::ItemClipsToShape)
+            painter->setClipPath(item->shape(), Qt::IntersectClip);
+
+        // Setup opacity
+        painter->setOpacity(item->effectiveOpacity());
+
+        // Draw the item
+        d->drawItemHelper(item, painter, &options[i], widget, d->painterStateProtection);
+
+        if (saveState)
+            painter->restore();
+
+        if (item->flags() & QGraphicsItem::ItemClipsChildrenToShape) {
+            // Clip descendents to this item's shape, and keep the painter
+            // saved.
+            childClippers.append(item);
+            painter->save();
+            painter->setClipPath(item->shape(), Qt::IntersectClip);
+        }
+    }
+
+    for (int i = 0; i < childClippers.size(); ++i)
+        painter->restore();
+
+    painter->setWorldTransform(viewTransform);
+}
+
+/*!
+    \since 4.4
+
+    Finds a new widget to give the keyboard focus to, as appropriate for Tab
+    and Shift+Tab, and returns true if it can find a new widget, or false if
+    it cannot. If \a next is true, this function searches forward; if \a next
+    is false, it searches backward.
+
+    You can reimplement this function in a subclass of QGraphicsScene to
+    provide fine-grained control over how tab focus passes inside your
+    scene. The default implementation is based on the tab focus chain defined
+    by QGraphicsWidget::setTabOrder().
+*/
+bool QGraphicsScene::focusNextPrevChild(bool next)
+{
+    Q_D(QGraphicsScene);
+
+    QGraphicsItem *item = focusItem();
+    if (item && !item->isWidget()) {
+        // Tab out of the scene.
+        return false;
+    }
+    if (!item) {
+        if (d->lastFocusItem && !d->lastFocusItem->isWidget()) {
+            // Restore focus to the last focusable non-widget item that had
+            // focus.
+            setFocusItem(d->lastFocusItem, next ? Qt::TabFocusReason : Qt::BacktabFocusReason);
+            return true;
+        }
+    }
+    if (!d->tabFocusFirst) {
+        // No widgets...
+        return false;
+    }
+
+    // The item must be a widget.
+    QGraphicsWidget *widget = 0;
+    if (!item) {
+        widget = next ? d->tabFocusFirst : d->tabFocusFirst->d_func()->focusPrev;
+    } else {
+        QGraphicsWidget *test = static_cast<QGraphicsWidget *>(item);
+        widget = next ? test->d_func()->focusNext : test->d_func()->focusPrev;
+        if ((next && widget == d->tabFocusFirst) || (!next && widget == d->tabFocusFirst->d_func()->focusPrev))
+            return false;
+    }
+    QGraphicsWidget *widgetThatHadFocus = widget;
+
+    // Run around the focus chain until we find a widget that can take tab focus.
+    do {
+        if (widget->flags() & QGraphicsItem::ItemIsFocusable
+            && widget->isEnabled() && widget->isVisibleTo(0)
+            && (widget->focusPolicy() & Qt::TabFocus)
+            && (!item || !item->isWindow() || item->isAncestorOf(widget))
+            ) {
+            setFocusItem(widget, next ? Qt::TabFocusReason : Qt::BacktabFocusReason);
+            return true;
+        }
+        widget = next ? widget->d_func()->focusNext : widget->d_func()->focusPrev;
+        if ((next && widget == d->tabFocusFirst) || (!next && widget == d->tabFocusFirst->d_func()->focusPrev))
+            return false;
+    } while (widget != widgetThatHadFocus);
+
+    return false;
+}
+
+/*!
+    \fn QGraphicsScene::changed(const QList<QRectF> &region)
+
+    This signal is emitted by QGraphicsScene when control reaches the
+    event loop, if the scene content changes. The \a region parameter
+    contains a list of scene rectangles that indicate the area that
+    has been changed.
+
+    \sa QGraphicsView::updateScene()
+*/
+
+/*!
+    \fn QGraphicsScene::sceneRectChanged(const QRectF &rect)
+
+    This signal is emitted by QGraphicsScene whenever the scene rect changes.
+    The \a rect parameter is the new scene rectangle.
+
+    \sa QGraphicsView::updateSceneRect()
+*/
+
+/*!
+    \fn QGraphicsScene::selectionChanged()
+    \since 4.3
+
+    This signal is emitted by QGraphicsScene whenever the selection
+    changes. You can call selectedItems() to get the new list of selected
+    items.
+
+    The selection changes whenever an item is selected or unselected, a
+    selection area is set, cleared or otherwise changed, if a preselected item
+    is added to the scene, or if a selected item is removed from the scene.
+
+    QGraphicsScene emits this signal only once for group selection operations.
+    For example, if you set a selection area, select or unselect a
+    QGraphicsItemGroup, or if you add or remove from the scene a parent item
+    that contains several selected items, selectionChanged() is emitted only
+    once after the operation has completed (instead of once for each item).
+
+    \sa setSelectionArea(), selectedItems(), QGraphicsItem::setSelected()
+*/
+
+/*!
+    \internal
+
+    This private function is called by QGraphicsItem, which is a friend of
+    QGraphicsScene. It is used by QGraphicsScene to record the rectangles that
+    need updating. It also launches a single-shot timer to ensure that
+    updated() will be emitted later.
+
+    The \a item parameter is the item that changed, and \a rect is the
+    area of the item that changed given in item coordinates.
+*/
+void QGraphicsScene::itemUpdated(QGraphicsItem *item, const QRectF &rect)
+{
+    Q_D(QGraphicsScene);
+    // Deliver the actual update.
+    if (!d->updateAll) {
+        if (d->views.isEmpty() || ((d->connectedSignals & d->changedSignalMask) && !item->d_ptr->itemIsUntransformable()
+                                   && qFuzzyCompare(item->boundingRegionGranularity(), qreal(0.0)))) {
+            // This block of code is kept for compatibility. Since 4.5, by default
+            // QGraphicsView does not connect the signal and we use the below
+            // method of delivering updates.
+            update(item->sceneBoundingRect());
+        } else {
+            // ### Remove _q_adjustedRects().
+            QRectF boundingRect = _q_adjustedRect(item->boundingRect());
+            if (!rect.isNull())
+                boundingRect &= _q_adjustedRect(rect);
+
+            // Update each view directly.
+            for (int i = 0; i < d->views.size(); ++i)
+                d->views.at(i)->d_func()->itemUpdated(item, boundingRect);
+        }
+    }
+    if (item->d_ptr->dirty) {
+        d->dirtyItems << item;
+        d->resetDirtyItemsLater();
+    }
+
+    // Update d->largestUntransformableItem by mapping this item's bounding
+    // rect back to the topmost untransformable item's untransformed
+    // coordinate system (which sort of equals the 1:1 coordinate system of an
+    // untransformed view).
+    if (item->d_ptr->itemIsUntransformable()) {
+        QGraphicsItem *parent = item;
+        while (parent && (parent->d_ptr->ancestorFlags & QGraphicsItemPrivate::AncestorIgnoresTransformations))
+            parent = parent->parentItem();
+        d->largestUntransformableItem |= item->mapToItem(parent, item->boundingRect()).boundingRect();
+    }
+
+    // Only track the automatically growing scene rect if the scene has no
+    // defined scene rect.
+    if (!d->hasSceneRect) {
+        QRectF oldGrowingItemsBoundingRect = d->growingItemsBoundingRect;
+        d->growingItemsBoundingRect |= _q_adjustedRect(item->sceneBoundingRect());
+        if (d->growingItemsBoundingRect != oldGrowingItemsBoundingRect)
+            emit sceneRectChanged(d->growingItemsBoundingRect);
+    }
+}
+
+/*!
+    \since 4.4
+
+    Returns the scene's style, or the same as QApplication::style() if the
+    scene has not been explicitly assigned a style.
+
+    \sa setStyle()
+*/
+QStyle *QGraphicsScene::style() const
+{
+    Q_D(const QGraphicsScene);
+    // ### This function, and the use of styles in general, is non-reentrant.
+    return d->style ? d->style : qApp->style();
+}
+
+/*!
+    \since 4.4
+
+    Sets or replaces the style of the scene to \a style, and reparents the
+    style to this scene. Any previously assigned style is deleted. The scene's
+    style defaults to QApplication::style(), and serves as the default for all
+    QGraphicsWidget items in the scene.
+
+    Changing the style, either directly by calling this function, or
+    indirectly by calling QApplication::setStyle(), will automatically update
+    the style for all widgets in the scene that do not have a style explicitly
+    assigned to them.
+
+    If \a style is 0, QGraphicsScene will revert to QApplication::style().
+
+    \sa style()
+*/
+void QGraphicsScene::setStyle(QStyle *style)
+{
+    Q_D(QGraphicsScene);
+    // ### This function, and the use of styles in general, is non-reentrant.
+    if (style == d->style)
+        return;
+
+    // Delete the old style,
+    delete d->style;
+    if ((d->style = style))
+        d->style->setParent(this);
+
+    // Notify the scene.
+    QEvent event(QEvent::StyleChange);
+    QApplication::sendEvent(this, &event);
+
+    // Notify all widgets that don't have a style explicitly set.
+    foreach (QGraphicsItem *item, items()) {
+        if (item->isWidget()) {
+            QGraphicsWidget *widget = static_cast<QGraphicsWidget *>(item);
+            if (!widget->testAttribute(Qt::WA_SetStyle))
+                QApplication::sendEvent(widget, &event);
+        }
+    }
+}
+
+/*!
+    \property QGraphicsScene::font
+    \since 4.4
+    \brief the scene's default font
+
+    This property provides the scene's font. The scene font defaults to,
+    and resolves all its entries from, QApplication::font.
+
+    If the scene's font changes, either directly through setFont() or
+    indirectly when the application font changes, QGraphicsScene first
+    sends itself a \l{QEvent::FontChange}{FontChange} event, and it then
+    sends \l{QEvent::FontChange}{FontChange} events to all top-level
+    widget items in the scene. These items respond by resolving their own
+    fonts to the scene, and they then notify their children, who again
+    notify their children, and so on, until all widget items have updated
+    their fonts.
+
+    Changing the scene font, (directly or indirectly through
+    QApplication::setFont(),) automatically schedules a redraw the entire
+    scene.
+
+    \sa QWidget::font, QApplication::setFont(), palette, style()
+*/
+QFont QGraphicsScene::font() const
+{
+    Q_D(const QGraphicsScene);
+    return d->font;
+}
+void QGraphicsScene::setFont(const QFont &font)
+{
+    Q_D(QGraphicsScene);
+    QFont naturalFont = qApp->font();
+    naturalFont.resolve(0);
+    QFont resolvedFont = font.resolve(naturalFont);
+    d->setFont_helper(resolvedFont);
+}
+
+/*!
+    \property QGraphicsScene::palette
+    \since 4.4
+    \brief the scene's default palette
+
+    This property provides the scene's palette. The scene palette defaults to,
+    and resolves all its entries from, QApplication::palette.
+
+    If the scene's palette changes, either directly through setPalette() or
+    indirectly when the application palette changes, QGraphicsScene first
+    sends itself a \l{QEvent::PaletteChange}{PaletteChange} event, and it then
+    sends \l{QEvent::PaletteChange}{PaletteChange} events to all top-level
+    widget items in the scene. These items respond by resolving their own
+    palettes to the scene, and they then notify their children, who again
+    notify their children, and so on, until all widget items have updated
+    their palettes.
+
+    Changing the scene palette, (directly or indirectly through
+    QApplication::setPalette(),) automatically schedules a redraw the entire
+    scene.
+
+    \sa QWidget::palette, QApplication::setPalette(), font, style()
+*/
+QPalette QGraphicsScene::palette() const
+{
+    Q_D(const QGraphicsScene);
+    return d->palette;
+}
+void QGraphicsScene::setPalette(const QPalette &palette)
+{
+    Q_D(QGraphicsScene);
+    QPalette naturalPalette = qApp->palette();
+    naturalPalette.resolve(0);
+    QPalette resolvedPalette = palette.resolve(naturalPalette);
+    d->setPalette_helper(resolvedPalette);
+}
+
+/*!
+    \since 4.4
+
+    Returns the current active window, or 0 if there is no window is currently
+    active.
+
+    \sa QGraphicsScene::setActiveWindow()
+*/
+QGraphicsWidget *QGraphicsScene::activeWindow() const
+{
+    Q_D(const QGraphicsScene);
+    return d->activeWindow;
+}
+
+/*!
+    \since 4.4
+    Activates \a widget, which must be a widget in this scene. You can also
+    pass 0 for \a widget, in which case QGraphicsScene will deactivate any
+    currently active window.
+
+    \sa activeWindow(), QGraphicsWidget::isActiveWindow()
+*/
+void QGraphicsScene::setActiveWindow(QGraphicsWidget *widget)
+{
+    Q_D(QGraphicsScene);
+    if (widget && widget->scene() != this) {
+        qWarning("QGraphicsScene::setActiveWindow: widget %p must be part of this scene",
+                 widget);
+        return;
+    }
+
+    // Activate the widget's window.
+    QGraphicsWidget *window = widget ? widget->window() : 0;
+    if (window == d->activeWindow)
+        return;
+
+    // Deactivate the last active window.
+    if (d->activeWindow) {
+        if (QGraphicsWidget *fw = d->activeWindow->focusWidget()) {
+            // Remove focus from the current focus item.
+            if (fw == focusItem())
+                setFocusItem(0, Qt::ActiveWindowFocusReason);
+        }
+
+        QEvent event(QEvent::WindowDeactivate);
+        QApplication::sendEvent(d->activeWindow, &event);
+    }
+
+    // Update activate state.
+    d->activeWindow = window;
+    QEvent event(QEvent::ActivationChange);
+    QApplication::sendEvent(this, &event);
+
+    // Activate
+    if (window) {
+        QEvent event(QEvent::WindowActivate);
+        QApplication::sendEvent(window, &event);
+
+        QList<QGraphicsItem *> siblingWindows;
+        QGraphicsItem *parent = window->parentItem();
+        // Raise ### inefficient for toplevels
+        foreach (QGraphicsItem *sibling, parent ? parent->children() : items()) {
+            if (sibling != window && sibling->isWidget()
+                && static_cast<QGraphicsWidget *>(sibling)->isWindow()) {
+                siblingWindows << sibling;
+            }
+        }
+
+        // Find the highest z value.
+        qreal z = window->zValue();
+        for (int i = 0; i < siblingWindows.size(); ++i)
+            z = qMax(z, siblingWindows.at(i)->zValue());
+
+        // This will probably never overflow.
+        const qreal litt = qreal(0.001);
+        window->setZValue(z + litt);
+
+        if (QGraphicsWidget *focusChild = window->focusWidget())
+            focusChild->setFocus(Qt::ActiveWindowFocusReason);
+    }
+}
+
+QT_END_NAMESPACE
+
+#include "moc_qgraphicsscene.cpp"
+
+#endif // QT_NO_GRAPHICSVIEW
diff --git a/src/gui/graphicsview/qgraphicsscene.h b/src/gui/graphicsview/qgraphicsscene.h
new file mode 100644
index 0000000..9802f87
--- /dev/null
+++ b/src/gui/graphicsview/qgraphicsscene.h
@@ -0,0 +1,301 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QGRAPHICSSCENE_H
+#define QGRAPHICSSCENE_H
+
+#include <QtCore/qobject.h>
+#include <QtCore/qpoint.h>
+#include <QtCore/qrect.h>
+#include <QtGui/qbrush.h>
+#include <QtGui/qfont.h>
+#include <QtGui/qtransform.h>
+#include <QtGui/qmatrix.h>
+#include <QtGui/qpen.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Gui)
+
+#if !defined(QT_NO_GRAPHICSVIEW) || (QT_EDITION & QT_MODULE_GRAPHICSVIEW) != QT_MODULE_GRAPHICSVIEW
+
+template<typename T> class QList;
+class QFocusEvent;
+class QFont;
+class QFontMetrics;
+class QGraphicsEllipseItem;
+class QGraphicsItem;
+class QGraphicsItemGroup;
+class QGraphicsLineItem;
+class QGraphicsPathItem;
+class QGraphicsPixmapItem;
+class QGraphicsPolygonItem;
+class QGraphicsProxyWidget;
+class QGraphicsRectItem;
+class QGraphicsSceneContextMenuEvent;
+class QGraphicsSceneDragDropEvent;
+class QGraphicsSceneEvent;
+class QGraphicsSceneHelpEvent;
+class QGraphicsSceneHoverEvent;
+class QGraphicsSceneMouseEvent;
+class QGraphicsSceneWheelEvent;
+class QGraphicsSimpleTextItem;
+class QGraphicsTextItem;
+class QGraphicsView;
+class QGraphicsWidget;
+class QHelpEvent;
+class QInputMethodEvent;
+class QKeyEvent;
+class QLineF;
+class QPainterPath;
+class QPixmap;
+class QPointF;
+class QPolygonF;
+class QRectF;
+class QSizeF;
+class QStyle;
+class QStyleOptionGraphicsItem;
+
+class QGraphicsScenePrivate;
+class Q_GUI_EXPORT QGraphicsScene : public QObject
+{
+    Q_OBJECT
+    Q_PROPERTY(QBrush backgroundBrush READ backgroundBrush WRITE setBackgroundBrush)
+    Q_PROPERTY(QBrush foregroundBrush READ foregroundBrush WRITE setForegroundBrush)
+    Q_PROPERTY(ItemIndexMethod itemIndexMethod READ itemIndexMethod WRITE setItemIndexMethod)
+    Q_PROPERTY(QRectF sceneRect READ sceneRect WRITE setSceneRect)
+    Q_PROPERTY(int bspTreeDepth READ bspTreeDepth WRITE setBspTreeDepth)
+    Q_PROPERTY(QPalette palette READ palette WRITE setPalette)
+    Q_PROPERTY(QFont font READ font WRITE setFont)
+    Q_PROPERTY(bool sortCacheEnabled READ isSortCacheEnabled WRITE setSortCacheEnabled)
+    Q_PROPERTY(bool stickyFocus READ stickyFocus WRITE setStickyFocus)
+
+public:
+    enum ItemIndexMethod {
+        BspTreeIndex,
+        NoIndex = -1
+    };
+
+    enum SceneLayer {
+        ItemLayer = 0x1,
+        BackgroundLayer = 0x2,
+        ForegroundLayer = 0x4,
+        AllLayers = 0xffff
+    };
+    Q_DECLARE_FLAGS(SceneLayers, SceneLayer)
+
+    QGraphicsScene(QObject *parent = 0);
+    QGraphicsScene(const QRectF &sceneRect, QObject *parent = 0);
+    QGraphicsScene(qreal x, qreal y, qreal width, qreal height, QObject *parent = 0);
+    virtual ~QGraphicsScene();
+
+    QRectF sceneRect() const;
+    inline qreal width() const { return sceneRect().width(); }
+    inline qreal height() const { return sceneRect().height(); }
+    void setSceneRect(const QRectF &rect);
+    inline void setSceneRect(qreal x, qreal y, qreal w, qreal h)
+    { setSceneRect(QRectF(x, y, w, h)); }
+
+    void render(QPainter *painter,
+                const QRectF &target = QRectF(), const QRectF &source = QRectF(),
+                Qt::AspectRatioMode aspectRatioMode = Qt::KeepAspectRatio);
+
+    ItemIndexMethod itemIndexMethod() const;
+    void setItemIndexMethod(ItemIndexMethod method);
+
+    bool isSortCacheEnabled() const;
+    void setSortCacheEnabled(bool enabled);
+
+    int bspTreeDepth() const;
+    void setBspTreeDepth(int depth);
+
+    QRectF itemsBoundingRect() const;
+
+    QList<QGraphicsItem *> items() const;
+    QList<QGraphicsItem *> items(const QPointF &pos) const;
+    QList<QGraphicsItem *> items(const QRectF &rect, Qt::ItemSelectionMode mode = Qt::IntersectsItemShape) const;
+    QList<QGraphicsItem *> items(const QPolygonF &polygon, Qt::ItemSelectionMode mode = Qt::IntersectsItemShape) const;
+    QList<QGraphicsItem *> items(const QPainterPath &path, Qt::ItemSelectionMode mode = Qt::IntersectsItemShape) const;
+    QList<QGraphicsItem *> collidingItems(const QGraphicsItem *item, Qt::ItemSelectionMode mode = Qt::IntersectsItemShape) const;
+    QGraphicsItem *itemAt(const QPointF &pos) const;
+
+    inline QList<QGraphicsItem *> items(qreal x, qreal y, qreal w, qreal h, Qt::ItemSelectionMode mode = Qt::IntersectsItemShape) const
+    { return items(QRectF(x, y, w, h), mode); }
+    inline QGraphicsItem *itemAt(qreal x, qreal y) const
+    { return itemAt(QPointF(x, y)); }
+
+    QList<QGraphicsItem *> selectedItems() const;
+    QPainterPath selectionArea() const;
+    void setSelectionArea(const QPainterPath &path);
+    void setSelectionArea(const QPainterPath &path, Qt::ItemSelectionMode);
+
+    QGraphicsItemGroup *createItemGroup(const QList<QGraphicsItem *> &items);
+    void destroyItemGroup(QGraphicsItemGroup *group);
+
+    void addItem(QGraphicsItem *item);
+    QGraphicsEllipseItem *addEllipse(const QRectF &rect, const QPen &pen = QPen(), const QBrush &brush = QBrush());
+    QGraphicsLineItem *addLine(const QLineF &line, const QPen &pen = QPen());
+    QGraphicsPathItem *addPath(const QPainterPath &path, const QPen &pen = QPen(), const QBrush &brush = QBrush());
+    QGraphicsPixmapItem *addPixmap(const QPixmap &pixmap);
+    QGraphicsPolygonItem *addPolygon(const QPolygonF &polygon, const QPen &pen = QPen(), const QBrush &brush = QBrush());
+    QGraphicsRectItem *addRect(const QRectF &rect, const QPen &pen = QPen(), const QBrush &brush = QBrush());
+    QGraphicsTextItem *addText(const QString &text, const QFont &font = QFont());
+    QGraphicsSimpleTextItem *addSimpleText(const QString &text, const QFont &font = QFont());
+    QGraphicsProxyWidget *addWidget(QWidget *widget, Qt::WindowFlags wFlags = 0);
+    inline QGraphicsEllipseItem *addEllipse(qreal x, qreal y, qreal w, qreal h, const QPen &pen = QPen(), const QBrush &brush = QBrush())
+    { return addEllipse(QRectF(x, y, w, h), pen, brush); }
+    inline QGraphicsLineItem *addLine(qreal x1, qreal y1, qreal x2, qreal y2, const QPen &pen = QPen())
+    { return addLine(QLineF(x1, y1, x2, y2), pen); }
+    inline QGraphicsRectItem *addRect(qreal x, qreal y, qreal w, qreal h, const QPen &pen = QPen(), const QBrush &brush = QBrush())
+    { return addRect(QRectF(x, y, w, h), pen, brush); }
+    void removeItem(QGraphicsItem *item);
+    
+    QGraphicsItem *focusItem() const;
+    void setFocusItem(QGraphicsItem *item, Qt::FocusReason focusReason = Qt::OtherFocusReason);
+    bool hasFocus() const;
+    void setFocus(Qt::FocusReason focusReason = Qt::OtherFocusReason);
+    void clearFocus();
+
+    void setStickyFocus(bool enabled);
+    bool stickyFocus() const;
+
+    QGraphicsItem *mouseGrabberItem() const;
+
+    QBrush backgroundBrush() const;
+    void setBackgroundBrush(const QBrush &brush);
+
+    QBrush foregroundBrush() const;
+    void setForegroundBrush(const QBrush &brush);
+
+    virtual QVariant inputMethodQuery(Qt::InputMethodQuery query) const;
+
+    QList <QGraphicsView *> views() const;
+
+    inline void update(qreal x, qreal y, qreal w, qreal h)
+    { update(QRectF(x, y, w, h)); }
+    inline void invalidate(qreal x, qreal y, qreal w, qreal h, SceneLayers layers = AllLayers)
+    { invalidate(QRectF(x, y, w, h), layers); }
+
+    QStyle *style() const;
+    void setStyle(QStyle *style);
+
+    QFont font() const;
+    void setFont(const QFont &font);
+
+    QPalette palette() const;
+    void setPalette(const QPalette &palette);
+
+    QGraphicsWidget *activeWindow() const;
+    void setActiveWindow(QGraphicsWidget *widget);
+
+public Q_SLOTS:
+    void update(const QRectF &rect = QRectF());
+    void invalidate(const QRectF &rect = QRectF(), SceneLayers layers = AllLayers);
+    void advance();
+    void clearSelection();
+    void clear();
+
+protected:
+    bool event(QEvent *event);
+    bool eventFilter(QObject *watched, QEvent *event);
+    virtual void contextMenuEvent(QGraphicsSceneContextMenuEvent *event);
+    virtual void dragEnterEvent(QGraphicsSceneDragDropEvent *event);
+    virtual void dragMoveEvent(QGraphicsSceneDragDropEvent *event);
+    virtual void dragLeaveEvent(QGraphicsSceneDragDropEvent *event);
+    virtual void dropEvent(QGraphicsSceneDragDropEvent *event);
+    virtual void focusInEvent(QFocusEvent *event);
+    virtual void focusOutEvent(QFocusEvent *event);
+    virtual void helpEvent(QGraphicsSceneHelpEvent *event);
+    virtual void keyPressEvent(QKeyEvent *event);
+    virtual void keyReleaseEvent(QKeyEvent *event);
+    virtual void mousePressEvent(QGraphicsSceneMouseEvent *event);
+    virtual void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
+    virtual void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
+    virtual void mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event);
+    virtual void wheelEvent(QGraphicsSceneWheelEvent *event);
+    virtual void inputMethodEvent(QInputMethodEvent *event);
+
+    virtual void drawBackground(QPainter *painter, const QRectF &rect);
+    virtual void drawForeground(QPainter *painter, const QRectF &rect);
+    virtual void drawItems(QPainter *painter, int numItems,
+                           QGraphicsItem *items[],
+                           const QStyleOptionGraphicsItem options[],
+                           QWidget *widget = 0);
+
+protected Q_SLOTS:
+    bool focusNextPrevChild(bool next);
+
+Q_SIGNALS:
+    void changed(const QList<QRectF> &region);
+    void sceneRectChanged(const QRectF &rect);
+    void selectionChanged();
+
+private:
+    void itemUpdated(QGraphicsItem *item, const QRectF &rect);
+
+    Q_DECLARE_PRIVATE(QGraphicsScene)
+    Q_DISABLE_COPY(QGraphicsScene)
+    Q_PRIVATE_SLOT(d_func(), void _q_updateIndex())
+    Q_PRIVATE_SLOT(d_func(), void _q_emitUpdated())
+    Q_PRIVATE_SLOT(d_func(), void _q_removeItemLater(QGraphicsItem *item))
+    Q_PRIVATE_SLOT(d_func(), void _q_updateLater())
+    Q_PRIVATE_SLOT(d_func(), void _q_polishItems())
+    Q_PRIVATE_SLOT(d_func(), void _q_updateSortCache())
+    Q_PRIVATE_SLOT(d_func(), void _q_resetDirtyItems())
+    friend class QGraphicsItem;
+    friend class QGraphicsItemPrivate;
+    friend class QGraphicsView;
+    friend class QGraphicsViewPrivate;
+    friend class QGraphicsWidget;
+    friend class QGraphicsWidgetPrivate;
+};
+
+Q_DECLARE_OPERATORS_FOR_FLAGS(QGraphicsScene::SceneLayers)
+
+#endif // QT_NO_GRAPHICSVIEW
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif
diff --git a/src/gui/graphicsview/qgraphicsscene_bsp.cpp b/src/gui/graphicsview/qgraphicsscene_bsp.cpp
new file mode 100644
index 0000000..f8fa450
--- /dev/null
+++ b/src/gui/graphicsview/qgraphicsscene_bsp.cpp
@@ -0,0 +1,328 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qgraphicsscene_bsp_p.h"
+
+#ifndef QT_NO_GRAPHICSVIEW
+
+#include <QtCore/qstring.h>
+#include <private/qgraphicsitem_p.h>
+
+QT_BEGIN_NAMESPACE
+
+class QGraphicsSceneInsertItemBspTreeVisitor : public QGraphicsSceneBspTreeVisitor
+{
+public:
+    QGraphicsItem *item;
+
+    void visit(QList<QGraphicsItem *> *items)
+    { items->prepend(item); }
+};
+
+class QGraphicsSceneRemoveItemBspTreeVisitor : public QGraphicsSceneBspTreeVisitor
+{
+public:
+    QGraphicsItem *item;
+
+    void visit(QList<QGraphicsItem *> *items)
+    { items->removeAll(item); }
+};
+
+class QGraphicsSceneFindItemBspTreeVisitor : public QGraphicsSceneBspTreeVisitor
+{
+public:
+    QList<QGraphicsItem *> *foundItems;
+
+    void visit(QList<QGraphicsItem *> *items)
+    {
+        for (int i = 0; i < items->size(); ++i) {
+            QGraphicsItem *item = items->at(i);
+            if (!item->d_func()->itemDiscovered && item->isVisible()) {
+                item->d_func()->itemDiscovered = 1;
+                foundItems->prepend(item);
+            }
+        }
+    }
+};
+
+QGraphicsSceneBspTree::QGraphicsSceneBspTree()
+    : leafCnt(0)
+{
+    insertVisitor = new QGraphicsSceneInsertItemBspTreeVisitor;
+    removeVisitor = new QGraphicsSceneRemoveItemBspTreeVisitor;
+    findVisitor = new QGraphicsSceneFindItemBspTreeVisitor;
+}
+
+QGraphicsSceneBspTree::~QGraphicsSceneBspTree()
+{
+    delete insertVisitor;
+    delete removeVisitor;
+    delete findVisitor;
+}
+
+void QGraphicsSceneBspTree::initialize(const QRectF &rect, int depth)
+{
+    this->rect = rect;
+    leafCnt = 0;
+    nodes.resize((1 << (depth + 1)) - 1);
+    nodes.fill(Node());
+    leaves.resize(1 << depth);
+    leaves.fill(QList<QGraphicsItem *>());
+
+    initialize(rect, depth, 0);
+}
+
+void QGraphicsSceneBspTree::clear()
+{
+    leafCnt = 0;
+    nodes.clear();
+    leaves.clear();
+}
+
+void QGraphicsSceneBspTree::insertItem(QGraphicsItem *item, const QRectF &rect)
+{
+    insertVisitor->item = item;
+    climbTree(insertVisitor, rect);
+}
+
+void QGraphicsSceneBspTree::removeItem(QGraphicsItem *item, const QRectF &rect)
+{
+    removeVisitor->item = item;
+    climbTree(removeVisitor, rect);
+}
+
+void QGraphicsSceneBspTree::removeItems(const QSet<QGraphicsItem *> &items)
+{
+    for (int i = 0; i < leaves.size(); ++i) {
+        QList<QGraphicsItem *> newItemList;
+        const QList<QGraphicsItem *> &oldItemList = leaves[i];
+        for (int j = 0; j < oldItemList.size(); ++j) {
+            QGraphicsItem *item = oldItemList.at(j);
+            if (!items.contains(item))
+                newItemList << item;
+        }
+        leaves[i] = newItemList;
+    }
+}
+
+QList<QGraphicsItem *> QGraphicsSceneBspTree::items(const QRectF &rect)
+{
+    QList<QGraphicsItem *> tmp;
+    findVisitor->foundItems = &tmp;
+    climbTree(findVisitor, rect);
+    return tmp;
+}
+
+QList<QGraphicsItem *> QGraphicsSceneBspTree::items(const QPointF &pos)
+{
+    QList<QGraphicsItem *> tmp;
+    findVisitor->foundItems = &tmp;
+    climbTree(findVisitor, pos);
+    return tmp;
+}
+
+int QGraphicsSceneBspTree::leafCount() const
+{
+    return leafCnt;
+}
+
+QString QGraphicsSceneBspTree::debug(int index) const
+{
+    const Node *node = &nodes.at(index);
+
+    QString tmp;
+    if (node->type == Node::Leaf) {
+        QRectF rect = rectForIndex(index);
+        if (!leaves[node->leafIndex].isEmpty()) {
+            tmp += QString::fromLatin1("[%1, %2, %3, %4] contains %5 items\n")
+                   .arg(rect.left()).arg(rect.top())
+                   .arg(rect.width()).arg(rect.height())
+                   .arg(leaves[node->leafIndex].size());
+        }
+    } else {
+        if (node->type == Node::Horizontal) {
+            tmp += debug(firstChildIndex(index));
+            tmp += debug(firstChildIndex(index) + 1);
+        } else {
+            tmp += debug(firstChildIndex(index));
+            tmp += debug(firstChildIndex(index) + 1);
+        }
+    }
+
+    return tmp;
+}
+
+void QGraphicsSceneBspTree::initialize(const QRectF &rect, int depth, int index)
+{
+    Node *node = &nodes[index];
+    if (index == 0) {
+        node->type = Node::Horizontal;
+        node->offset = rect.center().x();
+    }
+
+    if (depth) {
+        Node::Type type;
+        QRectF rect1, rect2;
+        qreal offset1, offset2;
+
+        if (node->type == Node::Horizontal) {
+            type = Node::Vertical;
+            rect1.setRect(rect.left(), rect.top(), rect.width(), rect.height() / 2);
+            rect2.setRect(rect1.left(), rect1.bottom(), rect1.width(), rect.height() - rect1.height());
+            offset1 = rect1.center().x();
+            offset2 = rect2.center().x();
+        } else {
+            type = Node::Horizontal;
+            rect1.setRect(rect.left(), rect.top(), rect.width() / 2, rect.height());
+            rect2.setRect(rect1.right(), rect1.top(), rect.width() - rect1.width(), rect1.height());
+            offset1 = rect1.center().y();
+            offset2 = rect2.center().y();
+        }
+
+        int childIndex = firstChildIndex(index);
+
+        Node *child = &nodes[childIndex];
+        child->offset = offset1;
+        child->type = type;
+
+        child = &nodes[childIndex + 1];
+        child->offset = offset2;
+        child->type = type;
+
+        initialize(rect1, depth - 1, childIndex);
+        initialize(rect2, depth - 1, childIndex + 1);
+    } else {
+        node->type = Node::Leaf;
+        node->leafIndex = leafCnt++;
+    }
+}
+
+void QGraphicsSceneBspTree::climbTree(QGraphicsSceneBspTreeVisitor *visitor, const QPointF &pos, int index)
+{
+    if (nodes.isEmpty())
+        return;
+
+    const Node &node = nodes.at(index);
+    int childIndex = firstChildIndex(index);
+
+    switch (node.type) {
+    case Node::Leaf: {
+        visitor->visit(&leaves[node.leafIndex]);
+        break;
+    }
+    case Node::Vertical:
+        if (pos.x() < node.offset) {
+            climbTree(visitor, pos, childIndex);
+        } else {
+            climbTree(visitor, pos, childIndex + 1);
+        }
+        break;
+    case Node::Horizontal:
+        if (pos.y() < node.offset) {
+            climbTree(visitor, pos, childIndex);
+        } else {
+            climbTree(visitor, pos, childIndex + 1);
+        }
+        break;
+    }
+}
+
+void QGraphicsSceneBspTree::climbTree(QGraphicsSceneBspTreeVisitor *visitor, const QRectF &rect, int index)
+{
+    if (nodes.isEmpty())
+        return;
+
+    const Node &node = nodes.at(index);
+    int childIndex = firstChildIndex(index);
+
+    switch (node.type) {
+    case Node::Leaf: {
+        visitor->visit(&leaves[node.leafIndex]);
+        break;
+    }
+    case Node::Vertical:
+        if (rect.left() < node.offset) {
+            climbTree(visitor, rect, childIndex);
+            if (rect.right() >= node.offset)
+                climbTree(visitor, rect, childIndex + 1);
+        } else {
+            climbTree(visitor, rect, childIndex + 1);
+        }
+        break;
+    case Node::Horizontal:
+        int childIndex = firstChildIndex(index);
+        if (rect.top() < node.offset) {
+            climbTree(visitor, rect, childIndex);
+            if (rect.bottom() >= node.offset)
+                climbTree(visitor, rect, childIndex + 1);
+        } else {
+            climbTree(visitor, rect, childIndex + 1);
+        }
+    }
+}
+
+QRectF QGraphicsSceneBspTree::rectForIndex(int index) const
+{
+    if (index <= 0)
+        return rect;
+
+    int parentIdx = parentIndex(index);
+    QRectF rect = rectForIndex(parentIdx);
+    const Node *parent = &nodes.at(parentIdx);
+
+    if (parent->type == Node::Horizontal) {
+        if (index & 1)
+            rect.setRight(parent->offset);
+        else
+            rect.setLeft(parent->offset);
+    } else {
+        if (index & 1)
+            rect.setBottom(parent->offset);
+        else
+            rect.setTop(parent->offset);
+    }
+
+    return rect;
+}
+
+QT_END_NAMESPACE
+
+#endif // QT_NO_GRAPHICSVIEW
diff --git a/src/gui/graphicsview/qgraphicsscene_bsp_p.h b/src/gui/graphicsview/qgraphicsscene_bsp_p.h
new file mode 100644
index 0000000..e6ceb78
--- /dev/null
+++ b/src/gui/graphicsview/qgraphicsscene_bsp_p.h
@@ -0,0 +1,137 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QGRAPHICSSCENEBSPTREE_P_H
+#define QGRAPHICSSCENEBSPTREE_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of other Qt classes.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtCore/qlist.h>
+
+#if !defined(QT_NO_GRAPHICSVIEW) || (QT_EDITION & QT_MODULE_GRAPHICSVIEW) != QT_MODULE_GRAPHICSVIEW
+
+#include <QtCore/qrect.h>
+#include <QtCore/qset.h>
+#include <QtCore/qvector.h>
+
+QT_BEGIN_NAMESPACE
+
+class QGraphicsItem;
+class QGraphicsSceneBspTreeVisitor;
+class QGraphicsSceneInsertItemBspTreeVisitor;
+class QGraphicsSceneRemoveItemBspTreeVisitor;
+class QGraphicsSceneFindItemBspTreeVisitor;
+
+class QGraphicsSceneBspTree
+{
+public:
+    struct Node
+    {
+        enum Type { Horizontal, Vertical, Leaf };
+        union {
+            qreal offset;
+            int leafIndex;
+        };
+        Type type;
+    };
+
+    QGraphicsSceneBspTree();
+    ~QGraphicsSceneBspTree();
+
+    void initialize(const QRectF &rect, int depth);
+    void clear();
+
+    void insertItem(QGraphicsItem *item, const QRectF &rect);
+    void removeItem(QGraphicsItem *item, const QRectF &rect);
+    void removeItems(const QSet<QGraphicsItem *> &items);
+
+    QList<QGraphicsItem *> items(const QRectF &rect);
+    QList<QGraphicsItem *> items(const QPointF &pos);
+    int leafCount() const;
+
+    inline int firstChildIndex(int index) const
+    { return index * 2 + 1; }
+
+    inline int parentIndex(int index) const
+    { return index > 0 ? ((index & 1) ? ((index - 1) / 2) : ((index - 2) / 2)) : -1; }
+
+    QString debug(int index) const;
+
+private:
+    void initialize(const QRectF &rect, int depth, int index);
+    void climbTree(QGraphicsSceneBspTreeVisitor *visitor, const QPointF &pos, int index = 0);
+    void climbTree(QGraphicsSceneBspTreeVisitor *visitor, const QRectF &rect, int index = 0);
+
+    void findItems(QList<QGraphicsItem *> *foundItems, const QRectF &rect, int index);
+    void findItems(QList<QGraphicsItem *> *foundItems, const QPointF &pos, int index);
+    QRectF rectForIndex(int index) const;
+
+    QVector<Node> nodes;
+    QVector<QList<QGraphicsItem *> > leaves;
+    int leafCnt;
+    QRectF rect;
+
+    QGraphicsSceneInsertItemBspTreeVisitor *insertVisitor;
+    QGraphicsSceneRemoveItemBspTreeVisitor *removeVisitor;
+    QGraphicsSceneFindItemBspTreeVisitor *findVisitor;
+};
+
+class QGraphicsSceneBspTreeVisitor
+{
+public:
+    virtual ~QGraphicsSceneBspTreeVisitor() { }
+    virtual void visit(QList<QGraphicsItem *> *items) = 0;
+};
+
+QT_END_NAMESPACE
+
+#endif // QT_NO_GRAPHICSVIEW
+
+#endif // QGRAPHICSSCENEBSPTREE_P_H
diff --git a/src/gui/graphicsview/qgraphicsscene_p.h b/src/gui/graphicsview/qgraphicsscene_p.h
new file mode 100644
index 0000000..9c165d1
--- /dev/null
+++ b/src/gui/graphicsview/qgraphicsscene_p.h
@@ -0,0 +1,265 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QGRAPHICSSCENE_P_H
+#define QGRAPHICSSCENE_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of qapplication_*.cpp, qwidget*.cpp and qfiledialog.cpp.  This header
+// file may change from version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "qgraphicsscene.h"
+
+#if !defined(QT_NO_GRAPHICSVIEW) || (QT_EDITION & QT_MODULE_GRAPHICSVIEW) != QT_MODULE_GRAPHICSVIEW
+
+#include "qgraphicsscene_bsp_p.h"
+#include "qgraphicsitem_p.h"
+
+#include <private/qobject_p.h>
+#include <QtCore/qbitarray.h>
+#include <QtCore/qlist.h>
+#include <QtCore/qmap.h>
+#include <QtCore/qset.h>
+#include <QtGui/qfont.h>
+#include <QtGui/qpalette.h>
+#include <QtGui/qstyle.h>
+
+QT_BEGIN_NAMESPACE
+
+class QGraphicsView;
+class QGraphicsWidget;
+
+class QGraphicsScenePrivate : public QObjectPrivate
+{
+    Q_DECLARE_PUBLIC(QGraphicsScene)
+public:
+    QGraphicsScenePrivate();
+    void init();
+
+    quint32 changedSignalMask;
+
+    QGraphicsScene::ItemIndexMethod indexMethod;
+    int bspTreeDepth;
+
+    QList<QGraphicsItem *> estimateItemsInRect(const QRectF &rect) const;
+    void addToIndex(QGraphicsItem *item);
+    void removeFromIndex(QGraphicsItem *item);
+    void resetIndex();
+
+    QGraphicsSceneBspTree bspTree;
+    void _q_updateIndex();
+    int lastItemCount;
+
+    QRectF sceneRect;
+    bool hasSceneRect;
+    QRectF growingItemsBoundingRect;
+    QRectF largestUntransformableItem;
+
+    void _q_emitUpdated();
+    QList<QRectF> updatedRects;
+    bool updateAll;
+    bool calledEmitUpdated;
+
+    QPainterPath selectionArea;
+    int selectionChanging;
+    QSet<QGraphicsItem *> selectedItems;
+    QList<QGraphicsItem *> unindexedItems;
+    QList<QGraphicsItem *> indexedItems;
+    QList<QGraphicsItem *> dirtyItems;
+    QList<QGraphicsItem *> pendingUpdateItems;
+    QList<QGraphicsItem *> unpolishedItems;
+    QMap<QGraphicsItem *, QPointF> movingItemsInitialPositions;
+    void _q_updateLater();
+    void _q_polishItems();
+
+    void _q_resetDirtyItems();
+    void resetDirtyItemsLater();
+    bool dirtyItemResetPending;
+
+    QList<int> freeItemIndexes;
+    bool regenerateIndex;
+
+    bool purgePending;
+    void _q_removeItemLater(QGraphicsItem *item);
+    QSet<QGraphicsItem *> removedItems;
+    void purgeRemovedItems();
+
+    QBrush backgroundBrush;
+    QBrush foregroundBrush;
+
+    int indexTimerId;
+    bool restartIndexTimer;
+    void startIndexTimer();
+
+    bool stickyFocus;
+    bool hasFocus;
+    QGraphicsItem *focusItem;
+    QGraphicsItem *lastFocusItem;
+    QGraphicsWidget *tabFocusFirst;
+    QGraphicsWidget *activeWindow;
+    int activationRefCount;
+
+    QList<QGraphicsWidget *> popupWidgets;
+    void addPopup(QGraphicsWidget *widget);
+    void removePopup(QGraphicsWidget *widget, bool itemIsDying = false);
+
+    QGraphicsItem *lastMouseGrabberItem;
+    bool lastMouseGrabberItemHasImplicitMouseGrab;
+    QList<QGraphicsItem *> mouseGrabberItems;
+    void grabMouse(QGraphicsItem *item, bool implicit = false);
+    void ungrabMouse(QGraphicsItem *item, bool itemIsDying = false);
+    void clearMouseGrabber();
+
+    QList<QGraphicsItem *> keyboardGrabberItems;
+    void grabKeyboard(QGraphicsItem *item);
+    void ungrabKeyboard(QGraphicsItem *item, bool itemIsDying = false);
+    void clearKeyboardGrabber();
+    
+    QGraphicsItem *dragDropItem;
+    QGraphicsWidget *enterWidget;
+    Qt::DropAction lastDropAction;
+    QList<QGraphicsItem *> cachedItemsUnderMouse;
+    QList<QGraphicsItem *> hoverItems;
+    QMap<Qt::MouseButton, QPointF> mouseGrabberButtonDownPos;
+    QMap<Qt::MouseButton, QPointF> mouseGrabberButtonDownScenePos;
+    QMap<Qt::MouseButton, QPoint> mouseGrabberButtonDownScreenPos;
+    QList<QGraphicsItem *> itemsAtPosition(const QPoint &screenPos,
+                                           const QPointF &scenePos,
+                                           QWidget *widget) const;
+    static bool itemCollidesWithPath(QGraphicsItem *item, const QPainterPath &path, Qt::ItemSelectionMode mode);
+    void storeMouseButtonsForMouseGrabber(QGraphicsSceneMouseEvent *event);
+
+    QList<QGraphicsView *> views;
+    bool painterStateProtection;
+
+    QMultiMap<QGraphicsItem *, QGraphicsItem *> sceneEventFilters;
+    void installSceneEventFilter(QGraphicsItem *watched, QGraphicsItem *filter);
+    void removeSceneEventFilter(QGraphicsItem *watched, QGraphicsItem *filter);
+    bool filterEvent(QGraphicsItem *item, QEvent *event);
+    bool sendEvent(QGraphicsItem *item, QEvent *event);
+
+    bool dispatchHoverEvent(QGraphicsSceneHoverEvent *hoverEvent);
+    bool itemAcceptsHoverEvents_helper(const QGraphicsItem *item) const;
+    void leaveScene();
+
+    void cloneDragDropEvent(QGraphicsSceneDragDropEvent *dest,
+                           QGraphicsSceneDragDropEvent *source);
+    void sendDragDropEvent(QGraphicsItem *item,
+                           QGraphicsSceneDragDropEvent *dragDropEvent);
+    void sendHoverEvent(QEvent::Type type, QGraphicsItem *item,
+                        QGraphicsSceneHoverEvent *hoverEvent);
+    void sendMouseEvent(QGraphicsSceneMouseEvent *mouseEvent);
+    void mousePressEventHandler(QGraphicsSceneMouseEvent *mouseEvent);
+    QGraphicsWidget *windowForItem(const QGraphicsItem *item) const;
+
+    QList<QGraphicsItem *> items_helper(const QRectF &rect,
+                                        Qt::ItemSelectionMode mode,
+                                        Qt::SortOrder order) const;
+    QList<QGraphicsItem *> items_helper(const QPolygonF &rect,
+                                        Qt::ItemSelectionMode mode,
+                                        Qt::SortOrder order) const;
+    QList<QGraphicsItem *> items_helper(const QPainterPath &rect,
+                                        Qt::ItemSelectionMode mode,
+                                        Qt::SortOrder order) const;
+    void childItems_helper(QList<QGraphicsItem *> *items,
+                           const QGraphicsItem *parent,
+                           const QRectF &rect,
+                           Qt::ItemSelectionMode mode) const;
+    void childItems_helper(QList<QGraphicsItem *> *items,
+                           const QGraphicsItem *parent,
+                           const QPolygonF &polygon,
+                           Qt::ItemSelectionMode mode) const;
+    void childItems_helper(QList<QGraphicsItem *> *items,
+                           const QGraphicsItem *parent,
+                           const QPainterPath &path,
+                           Qt::ItemSelectionMode mode) const;
+
+    bool sortCacheEnabled;
+    bool updatingSortCache;
+    void invalidateSortCache();
+    static void climbTree(QGraphicsItem *item, int *stackingOrder);
+    void _q_updateSortCache();
+
+    static bool closestItemFirst_withoutCache(const QGraphicsItem *item1, const QGraphicsItem *item2);
+    static bool closestItemLast_withoutCache(const QGraphicsItem *item1, const QGraphicsItem *item2);
+
+    static inline bool closestItemFirst_withCache(const QGraphicsItem *item1, const QGraphicsItem *item2)
+    { 
+        return item1->d_ptr->globalStackingOrder < item2->d_ptr->globalStackingOrder;
+    }
+    static inline bool closestItemLast_withCache(const QGraphicsItem *item1, const QGraphicsItem *item2)
+    {
+        return item1->d_ptr->globalStackingOrder >= item2->d_ptr->globalStackingOrder;
+    }
+
+    static void sortItems(QList<QGraphicsItem *> *itemList, Qt::SortOrder order, bool cached);
+
+    void drawItemHelper(QGraphicsItem *item, QPainter *painter,
+                        const QStyleOptionGraphicsItem *option, QWidget *widget,
+                        bool painterStateProtection);
+    
+    QStyle *style;
+    QFont font;
+    void setFont_helper(const QFont &font);
+    void resolveFont();
+    void updateFont(const QFont &font);
+    QPalette palette;
+    void setPalette_helper(const QPalette &palette);
+    void resolvePalette();
+    void updatePalette(const QPalette &palette);
+
+    mutable QVector<QTransform> sceneTransformCache;
+    mutable QBitArray validTransforms;
+    mutable QVector<int> freeSceneTransformSlots;
+};
+
+QT_END_NAMESPACE
+
+#endif // QT_NO_GRAPHICSVIEW
+
+#endif
diff --git a/src/gui/graphicsview/qgraphicssceneevent.cpp b/src/gui/graphicsview/qgraphicssceneevent.cpp
new file mode 100644
index 0000000..57c79db
--- /dev/null
+++ b/src/gui/graphicsview/qgraphicssceneevent.cpp
@@ -0,0 +1,1678 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*!
+    \class QGraphicsSceneEvent
+    \brief The QGraphicsSceneEvent class provides a base class for all
+    graphics view related events.
+    \since 4.2
+    \ingroup multimedia
+    \ingroup graphicsview-api
+
+    When a QGraphicsView receives Qt mouse, keyboard, and drag and
+    drop events (QMouseEvent, QKeyEvent, QDragEvent, etc.), it
+    translates them into instances of QGraphicsSceneEvent subclasses
+    and forwards them to the QGraphicsScene it displays. The scene
+    then forwards the events to the relevant items.
+
+    For example, when a QGraphicsView receives a QMouseEvent of type
+    MousePress as a response to a user click, the view sends a
+    QGraphicsSceneMouseEvent of type GraphicsSceneMousePress to the
+    underlying QGraphicsScene through its
+    \l{QGraphicsScene::}{mousePressEvent()} function. The default
+    QGraphicsScene::mousePressEvent() implementation determines which
+    item was clicked and forwards the event to
+    QGraphicsItem::mousePressEvent().
+
+    \omit ### Beskrive widget() \endomit
+
+    Subclasses such as QGraphicsSceneMouseEvent and
+    QGraphicsSceneContextMenuEvent provide the coordinates from the
+    original QEvent in screen, scene, and item coordinates (see
+    \l{QGraphicsSceneMouseEvent::}{screenPos()},
+    \l{QGraphicsSceneMouseEvent::}{scenePos()}, and
+    \l{QGraphicsSceneMouseEvent::}{pos()}). The item coordinates are
+    set by the QGraphicsScene before it forwards the event to the
+    event to a QGraphicsItem. The mouse events also add the
+    possibility to retrieve the coordinates from the last event
+    received by the view (see
+    \l{QGraphicsSceneMouseEvent::}{lastScreenPos()},
+    \l{QGraphicsSceneMouseEvent::}{lastScenePos()}, and
+    \l{QGraphicsSceneMouseEvent::}{lastPos()}). 
+
+    \sa QEvent
+*/
+
+/*!
+    \class QGraphicsSceneMouseEvent
+    \brief The QGraphicsSceneMouseEvent class provides mouse events 
+           in the graphics view framework.
+    \since 4.2
+    \ingroup multimedia
+    \ingroup graphicsview-api
+
+    When a QGraphicsView receives a QMouseEvent, it translates it to
+    a QGraphicsSceneMouseEvent. The event is then forwarded to the
+    QGraphicsScene associated with the view.
+
+    In addition to containing the item, scene, and screen coordinates
+    of the event (as pos(), scenePos(), and screenPos()), mouse
+    events also contain the coordinates of the previous mouse
+    event received by the view. These can be retrieved with
+    lastPos(), lastScreenPos(), and lastScenePos().
+
+    \sa QGraphicsSceneContextMenuEvent,
+        QGraphicsSceneHoverEvent, QGraphicsSceneWheelEvent,
+        QMouseEvent
+*/
+
+/*!
+    \class QGraphicsSceneWheelEvent
+    \brief The QGraphicsSceneWheelEvent class provides wheel events 
+           in the graphics view framework.
+    \brief The QGraphicsSceneWheelEvent class provides wheel events in the
+    graphics view framework.
+    \since 4.2
+    \ingroup multimedia
+    \ingroup graphicsview-api
+
+    \l{QWheelEvent}{QWheelEvent}s received by a QGraphicsView are translated
+    into QGraphicsSceneWheelEvents; it translates the QWheelEvent::globalPos()
+    into item, scene, and screen coordinates (pos(), scenePos(), and
+    screenPos()).
+
+    \sa QGraphicsSceneMouseEvent, QGraphicsSceneContextMenuEvent,
+    QGraphicsSceneHoverEvent, QWheelEvent
+*/
+
+/*!
+    \class QGraphicsSceneContextMenuEvent
+    \brief The QGraphicsSceneContextMenuEvent class provides context
+           menu events in the graphics view framework.
+    \since 4.2
+    \ingroup multimedia
+    \ingroup graphicsview-api
+
+    A QContextMenuEvent received by a QGraphicsView is translated
+    into a QGraphicsSceneContextMenuEvent. The
+    QWheelEvent::globalPos() is translated into item, scene, and
+    screen coordinates (pos(), scenePos(), and screenPos()).
+
+    \sa QGraphicsSceneMouseEvent, QGraphicsSceneWheelEvent,
+    QContextMenuEvent
+*/
+
+/*!
+    \enum QGraphicsSceneContextMenuEvent::Reason
+
+    This enum describes the reason why the context event was sent.
+
+    \value Mouse The mouse caused the event to be sent. On most
+    platforms, this means the right mouse button was clicked.
+
+    \value Keyboard The keyboard caused this event to be sent. On
+    Windows and Mac OS X, this means the menu button was pressed.
+
+    \value Other The event was sent by some other means (i.e. not
+    by the mouse or keyboard).
+*/
+
+/*!
+    \class QGraphicsSceneHoverEvent
+    \brief The QGraphicsSceneHoverEvent class provides hover events 
+           in the graphics view framework.
+    \since 4.2
+    \ingroup multimedia
+    \ingroup graphicsview-api
+
+    When a QGraphicsView receives a QHoverEvent event, it translates
+    it into QGraphicsSceneHoverEvent. The event is then forwarded to
+    the QGraphicsScene associated with the view.
+
+    \sa QGraphicsSceneMouseEvent, QGraphicsSceneContextMenuEvent,
+        QGraphicsSceneWheelEvent, QHoverEvent
+*/
+
+/*!
+    \class QGraphicsSceneHelpEvent
+    \brief The QGraphicsSceneHelpEvent class provides events when a 
+           tooltip is requested.
+    \since 4.2
+    \ingroup multimedia
+    \ingroup graphicsview-api
+
+    When a QGraphicsView receives a QEvent of type
+    QEvent::ToolTip, it creates a QGraphicsSceneHelpEvent, which is
+    forwarded to the scene. You can set a tooltip on a QGraphicsItem
+    with \l{QGraphicsItem::}{setToolTip()}; by default QGraphicsScene
+    displays the tooltip of the QGraphicsItem with the highest
+    z-value (i.e, the top-most item) under the mouse position.
+
+    QGraphicsView does not forward events when
+    \l{QWhatsThis}{"What's This"} and \l{QStatusTipEvent}{status tip}
+    help is requested. If you need this, you can reimplement
+    QGraphicsView::viewportEvent() and forward QStatusTipEvent
+    events and \l{QEvent}{QEvents} of type QEvent::WhatsThis to the
+    scene.
+
+    \sa QEvent
+*/
+
+/*!
+    \class QGraphicsSceneDragDropEvent
+    \brief The QGraphicsSceneDragDropEvent class provides events for
+           drag and drop in the graphics view framework. 
+    \since 4.2
+    \ingroup multimedia
+    \ingroup graphicsview-api
+
+    QGraphicsView inherits the drag and drop functionality provided
+    by QWidget. When it receives a drag and drop event, it translates
+    it to a QGraphicsSceneDragDropEvent.
+
+    QGraphicsSceneDragDropEvent stores events of type
+    GraphicsSceneDragEnter, GraphicsSceneDragLeave,
+    GraphicsSceneDragMove, or GraphicsSceneDrop.
+
+    QGraphicsSceneDragDropEvent contains the position of the mouse
+    cursor in both item, scene, and screen coordinates; this can be
+    retrieved with pos(), scenePos(), and screenPos().
+
+    The scene sends the event to the first QGraphicsItem under the
+    mouse cursor that accepts drops; a graphics item is set to accept
+    drops with \l{QGraphicsItem::}{setAcceptDrops()}.
+*/
+
+/*!
+    \class QGraphicsSceneResizeEvent
+    \brief The QGraphicsSceneResizeEvent class provides events for widget
+    resizing in the graphics view framework.
+    \since 4.4
+    \ingroup multimedia
+    \ingroup graphicsview-api
+
+    A QGraphicsWidget sends itself a QGraphicsSceneResizeEvent immediately
+    when its geometry changes.
+
+    It's similar to QResizeEvent, but its sizes, oldSize() and newSize(), use
+    QSizeF instead of QSize.
+
+    \sa QGraphicsWidget::setGeometry(), QGraphicsWidget::resize()
+*/
+
+/*!
+    \class QGraphicsSceneMoveEvent
+    \brief The QGraphicsSceneMoveEvent class provides events for widget
+    moving in the graphics view framework.
+    \since 4.4
+    \ingroup multimedia
+    \ingroup graphicsview-api
+
+    A QGraphicsWidget sends itself a QGraphicsSceneMoveEvent immediately when
+    its local position changes. The delivery is implemented as part of
+    QGraphicsItem::itemChange().
+
+    It's similar to QMoveEvent, but its positions, oldPos() and newPos(), use
+    QPointF instead of QPoint.
+
+    \sa QGraphicsItem::setPos(), QGraphicsItem::ItemPositionChange,
+    QGraphicsItem::ItemPositionHasChanged
+*/
+
+#include "qgraphicssceneevent.h"
+
+#ifndef QT_NO_GRAPHICSVIEW
+
+#ifndef QT_NO_DEBUG
+#include <QtCore/qdebug.h>
+#endif
+#include <QtCore/qmap.h>
+#include <QtCore/qpoint.h>
+#include <QtCore/qsize.h>
+#include <QtCore/qstring.h>
+
+QT_BEGIN_NAMESPACE
+
+class QGraphicsSceneEventPrivate
+{
+public:
+    inline QGraphicsSceneEventPrivate()
+        : widget(0),
+          q_ptr(0)
+    { }
+
+    inline virtual ~QGraphicsSceneEventPrivate()
+    { }
+
+    QWidget *widget;
+    QGraphicsSceneEvent *q_ptr;
+};
+
+/*!
+    \internal
+
+    Constructs a generic graphics scene event of the specified \a type.
+*/
+QGraphicsSceneEvent::QGraphicsSceneEvent(Type type)
+    : QEvent(type), d_ptr(new QGraphicsSceneEventPrivate)
+{
+    d_ptr->q_ptr = this;
+}
+
+/*!
+    \internal
+
+    Constructs a generic graphics scene event.
+*/
+QGraphicsSceneEvent::QGraphicsSceneEvent(QGraphicsSceneEventPrivate &dd, Type type)
+    : QEvent(type), d_ptr(&dd)
+{
+    d_ptr->q_ptr = this;
+}
+
+/*!
+    Destroys the event.
+*/
+QGraphicsSceneEvent::~QGraphicsSceneEvent()
+{
+    delete d_ptr;
+}
+
+/*!
+    Returns the widget where the event originated, or 0 if the event
+    originates from another application.
+*/
+QWidget *QGraphicsSceneEvent::widget() const
+{
+    return d_ptr->widget;
+}
+
+/*!
+    \internal
+
+    Sets the \a widget related to this event.
+
+    \sa widget()
+*/
+void QGraphicsSceneEvent::setWidget(QWidget *widget)
+{
+    d_ptr->widget = widget;
+}
+
+class QGraphicsSceneMouseEventPrivate : public QGraphicsSceneEventPrivate
+{
+    Q_DECLARE_PUBLIC(QGraphicsSceneMouseEvent)
+public:
+    inline QGraphicsSceneMouseEventPrivate()
+        : button(Qt::NoButton),
+          buttons(0), modifiers(0)
+    { }
+
+    QPointF pos;
+    QPointF scenePos;
+    QPoint screenPos;
+    QPointF lastPos;
+    QPointF lastScenePos;
+    QPoint lastScreenPos;
+    QMap<Qt::MouseButton, QPointF> buttonDownPos;
+    QMap<Qt::MouseButton, QPointF> buttonDownScenePos;
+    QMap<Qt::MouseButton, QPoint> buttonDownScreenPos;
+    Qt::MouseButton button;
+    Qt::MouseButtons buttons;
+    Qt::KeyboardModifiers modifiers;
+};
+
+/*!
+    \internal
+
+    Constructs a generic graphics scene mouse event of the specified \a type.
+*/
+QGraphicsSceneMouseEvent::QGraphicsSceneMouseEvent(Type type)
+    : QGraphicsSceneEvent(*new QGraphicsSceneMouseEventPrivate, type)
+{
+}
+
+/*!
+    Destroys the event.
+*/
+QGraphicsSceneMouseEvent::~QGraphicsSceneMouseEvent()
+{
+}
+
+/*!
+    Returns the mouse cursor position in item coordinates.
+
+    \sa scenePos(), screenPos(), lastPos()
+*/
+QPointF QGraphicsSceneMouseEvent::pos() const
+{
+    Q_D(const QGraphicsSceneMouseEvent);
+    return d->pos;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsSceneMouseEvent::setPos(const QPointF &pos)
+{
+    Q_D(QGraphicsSceneMouseEvent);
+    d->pos = pos;
+}
+
+/*!
+    Returns the mouse cursor position in scene coordinates.
+
+    \sa pos(), screenPos(), lastScenePos()
+*/
+QPointF QGraphicsSceneMouseEvent::scenePos() const
+{
+    Q_D(const QGraphicsSceneMouseEvent);
+    return d->scenePos;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsSceneMouseEvent::setScenePos(const QPointF &pos)
+{
+    Q_D(QGraphicsSceneMouseEvent);
+    d->scenePos = pos;
+}
+
+/*!
+    Returns the mouse cursor position in screen coordinates.
+
+    \sa pos(), scenePos(), lastScreenPos()
+*/
+QPoint QGraphicsSceneMouseEvent::screenPos() const
+{
+    Q_D(const QGraphicsSceneMouseEvent);
+    return d->screenPos;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsSceneMouseEvent::setScreenPos(const QPoint &pos)
+{
+    Q_D(QGraphicsSceneMouseEvent);
+    d->screenPos = pos;
+}
+
+/*!
+    Returns the mouse cursor position in item coordinates where the specified
+    \a button was clicked.
+
+    \sa buttonDownScenePos(), buttonDownScreenPos(), pos()
+*/
+QPointF QGraphicsSceneMouseEvent::buttonDownPos(Qt::MouseButton button) const
+{
+    Q_D(const QGraphicsSceneMouseEvent);
+    return d->buttonDownPos.value(button);
+}
+
+/*!
+    \internal
+*/
+void QGraphicsSceneMouseEvent::setButtonDownPos(Qt::MouseButton button, const QPointF &pos)
+{
+    Q_D(QGraphicsSceneMouseEvent);
+    d->buttonDownPos.insert(button, pos);
+}
+
+/*!
+    Returns the mouse cursor position in scene coordinates where the
+    specified \a button was clicked.
+
+    \sa buttonDownPos(), buttonDownScreenPos(), scenePos()
+*/
+QPointF QGraphicsSceneMouseEvent::buttonDownScenePos(Qt::MouseButton button) const
+{
+    Q_D(const QGraphicsSceneMouseEvent);
+    return d->buttonDownScenePos.value(button);
+}
+
+/*!
+    \internal
+*/
+void QGraphicsSceneMouseEvent::setButtonDownScenePos(Qt::MouseButton button, const QPointF &pos)
+{
+    Q_D(QGraphicsSceneMouseEvent);
+    d->buttonDownScenePos.insert(button, pos);
+}
+
+/*!
+    Returns the mouse cursor position in screen coordinates where the
+    specified \a button was clicked.
+
+    \sa screenPos(), buttonDownPos(), buttonDownScenePos()
+*/
+QPoint QGraphicsSceneMouseEvent::buttonDownScreenPos(Qt::MouseButton button) const
+{
+    Q_D(const QGraphicsSceneMouseEvent);
+    return d->buttonDownScreenPos.value(button);
+}
+
+/*!
+    \internal
+*/
+void QGraphicsSceneMouseEvent::setButtonDownScreenPos(Qt::MouseButton button, const QPoint &pos)
+{
+    Q_D(QGraphicsSceneMouseEvent);
+    d->buttonDownScreenPos.insert(button, pos);
+}
+
+/*!
+    Returns the last recorded mouse cursor position in item
+    coordinates.
+
+    \sa lastScenePos(), lastScreenPos(), pos()
+*/
+QPointF QGraphicsSceneMouseEvent::lastPos() const
+{
+    Q_D(const QGraphicsSceneMouseEvent);
+    return d->lastPos;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsSceneMouseEvent::setLastPos(const QPointF &pos)
+{
+    Q_D(QGraphicsSceneMouseEvent);
+    d->lastPos = pos;
+}
+
+/*!
+    Returns the last recorded mouse cursor position in scene 
+    coordinates. The last recorded position is the position of
+    the previous mouse event received by the view that created
+    the event.
+
+    \sa lastPos(), lastScreenPos(), scenePos()
+*/
+QPointF QGraphicsSceneMouseEvent::lastScenePos() const
+{
+    Q_D(const QGraphicsSceneMouseEvent);
+    return d->lastScenePos;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsSceneMouseEvent::setLastScenePos(const QPointF &pos)
+{
+    Q_D(QGraphicsSceneMouseEvent);
+    d->lastScenePos = pos;
+}
+
+/*!
+    Returns the last recorded mouse cursor position in screen 
+    coordinates. The last recorded position is the position of
+    the previous mouse event received by the view that created
+    the event.
+
+    \sa lastPos(), lastScenePos(), screenPos()
+*/
+QPoint QGraphicsSceneMouseEvent::lastScreenPos() const
+{
+    Q_D(const QGraphicsSceneMouseEvent);
+    return d->lastScreenPos;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsSceneMouseEvent::setLastScreenPos(const QPoint &pos)
+{
+    Q_D(QGraphicsSceneMouseEvent);
+    d->lastScreenPos = pos;
+}
+
+/*!
+    Returns the combination of mouse buttons that were pressed at the
+    time the event was sent.
+
+    \sa button(), modifiers()
+*/
+Qt::MouseButtons QGraphicsSceneMouseEvent::buttons() const
+{
+    Q_D(const QGraphicsSceneMouseEvent);
+    return d->buttons;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsSceneMouseEvent::setButtons(Qt::MouseButtons buttons)
+{
+    Q_D(QGraphicsSceneMouseEvent);
+    d->buttons = buttons;
+}
+
+/*!
+    Returns the mouse button (if any) that caused the event.
+
+    \sa buttons(), modifiers()
+*/
+Qt::MouseButton QGraphicsSceneMouseEvent::button() const
+{
+    Q_D(const QGraphicsSceneMouseEvent);
+    return d->button;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsSceneMouseEvent::setButton(Qt::MouseButton button)
+{
+    Q_D(QGraphicsSceneMouseEvent);
+    d->button = button;
+}
+
+/*!
+    Returns the keyboard modifiers in use at the time the event was
+    sent.
+
+    \sa buttons(), button()
+*/
+Qt::KeyboardModifiers QGraphicsSceneMouseEvent::modifiers() const
+{
+    Q_D(const QGraphicsSceneMouseEvent);
+    return d->modifiers;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsSceneMouseEvent::setModifiers(Qt::KeyboardModifiers modifiers)
+{
+    Q_D(QGraphicsSceneMouseEvent);
+    d->modifiers = modifiers;
+}
+
+class QGraphicsSceneWheelEventPrivate : public QGraphicsSceneEventPrivate
+{
+    Q_DECLARE_PUBLIC(QGraphicsSceneWheelEvent)
+public:
+    inline QGraphicsSceneWheelEventPrivate()
+        : buttons(0), modifiers(0), delta(0), orientation(Qt::Horizontal)
+    { }
+
+    QPointF pos;
+    QPointF scenePos;
+    QPoint screenPos;
+    Qt::MouseButtons buttons;
+    Qt::KeyboardModifiers modifiers;
+    int delta;
+    Qt::Orientation orientation;
+};
+
+/*!
+    \internal
+
+    Constructs a QGraphicsSceneWheelEvent of type \a type, which
+    is always QEvent::GraphicsSceneWheel.
+*/
+QGraphicsSceneWheelEvent::QGraphicsSceneWheelEvent(Type type)
+    : QGraphicsSceneEvent(*new QGraphicsSceneWheelEventPrivate, type)
+{
+}
+
+/*!
+    Destroys the QGraphicsSceneWheelEvent.
+*/
+QGraphicsSceneWheelEvent::~QGraphicsSceneWheelEvent()
+{
+}
+
+/*!
+    Returns the position of the cursor in item coordinates when the
+    wheel event occurred.
+
+    \sa scenePos(), screenPos()
+*/
+QPointF QGraphicsSceneWheelEvent::pos() const
+{
+    Q_D(const QGraphicsSceneWheelEvent);
+    return d->pos;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsSceneWheelEvent::setPos(const QPointF &pos)
+{
+    Q_D(QGraphicsSceneWheelEvent);
+    d->pos = pos;
+}
+
+/*!
+    Returns the position of the cursor in scene coordinates when the wheel
+    event occurred.
+
+    \sa pos(), screenPos()
+*/
+QPointF QGraphicsSceneWheelEvent::scenePos() const
+{
+    Q_D(const QGraphicsSceneWheelEvent);
+    return d->scenePos;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsSceneWheelEvent::setScenePos(const QPointF &pos)
+{
+    Q_D(QGraphicsSceneWheelEvent);
+    d->scenePos = pos;
+}
+
+/*!
+    Returns the position of the cursor in screen coordinates when the wheel
+    event occurred.
+
+    \sa pos(), scenePos()
+*/
+QPoint QGraphicsSceneWheelEvent::screenPos() const
+{
+    Q_D(const QGraphicsSceneWheelEvent);
+    return d->screenPos;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsSceneWheelEvent::setScreenPos(const QPoint &pos)
+{
+    Q_D(QGraphicsSceneWheelEvent);
+    d->screenPos = pos;
+}
+
+/*!
+    Returns the mouse buttons that were pressed when the wheel event occurred.
+
+    \sa modifiers()
+*/
+Qt::MouseButtons QGraphicsSceneWheelEvent::buttons() const
+{
+    Q_D(const QGraphicsSceneWheelEvent);
+    return d->buttons;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsSceneWheelEvent::setButtons(Qt::MouseButtons buttons)
+{
+    Q_D(QGraphicsSceneWheelEvent);
+    d->buttons = buttons;
+}
+
+/*!
+    Returns the keyboard modifiers that were active when the wheel event
+    occurred.
+
+    \sa buttons()
+*/
+Qt::KeyboardModifiers QGraphicsSceneWheelEvent::modifiers() const
+{
+    Q_D(const QGraphicsSceneWheelEvent);
+    return d->modifiers;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsSceneWheelEvent::setModifiers(Qt::KeyboardModifiers modifiers)
+{
+    Q_D(QGraphicsSceneWheelEvent);
+    d->modifiers = modifiers;
+}
+
+/*!
+    Returns the distance that the wheel is rotated, in eighths (1/8s)
+    of a degree. A positive value indicates that the wheel was
+    rotated forwards away from the user; a negative value indicates
+    that the wheel was rotated backwards toward the user.
+
+    Most mouse types work in steps of 15 degrees, in which case the delta
+    value is a multiple of 120 (== 15 * 8).
+*/
+int QGraphicsSceneWheelEvent::delta() const
+{
+    Q_D(const QGraphicsSceneWheelEvent);
+    return d->delta;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsSceneWheelEvent::setDelta(int delta)
+{
+    Q_D(QGraphicsSceneWheelEvent);
+    d->delta = delta;
+}
+
+/*!
+    Returns the wheel orientation.
+*/
+Qt::Orientation QGraphicsSceneWheelEvent::orientation() const
+{
+    Q_D(const QGraphicsSceneWheelEvent);
+    return d->orientation;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsSceneWheelEvent::setOrientation(Qt::Orientation orientation)
+{
+    Q_D(QGraphicsSceneWheelEvent);
+    d->orientation = orientation;
+}
+
+class QGraphicsSceneContextMenuEventPrivate : public QGraphicsSceneEventPrivate
+{
+    Q_DECLARE_PUBLIC(QGraphicsSceneContextMenuEvent)
+        public:
+    inline QGraphicsSceneContextMenuEventPrivate()
+        : modifiers(0), reason(QGraphicsSceneContextMenuEvent::Other)
+        { }
+
+    QPointF pos;
+    QPointF scenePos;
+    QPoint screenPos;
+    Qt::KeyboardModifiers modifiers;
+    QGraphicsSceneContextMenuEvent::Reason reason;
+};
+
+/*!
+    \internal
+
+    Constructs a graphics scene context menu event of the specified \a type.
+*/
+QGraphicsSceneContextMenuEvent::QGraphicsSceneContextMenuEvent(Type type)
+    : QGraphicsSceneEvent(*new QGraphicsSceneContextMenuEventPrivate, type)
+{
+}
+
+/*!
+    Destroys the event.
+*/
+QGraphicsSceneContextMenuEvent::~QGraphicsSceneContextMenuEvent()
+{
+}
+
+/*!
+    Returns the position of the mouse cursor in item coordinates at the moment
+    the the context menu was requested.
+
+    \sa scenePos(), screenPos()
+*/
+QPointF QGraphicsSceneContextMenuEvent::pos() const
+{
+    Q_D(const QGraphicsSceneContextMenuEvent);
+    return d->pos;
+}
+
+/*!
+    \fn void QGraphicsSceneContextMenuEvent::setPos(const QPointF &point)
+    \internal
+
+    Sets the position associated with the context menu to the given \a point
+    in item coordinates.
+*/
+void QGraphicsSceneContextMenuEvent::setPos(const QPointF &pos)
+{
+    Q_D(QGraphicsSceneContextMenuEvent);
+    d->pos = pos;
+}
+
+/*!
+    Returns the position of the mouse cursor in scene coordinates at the moment the
+    the context menu was requested.
+
+    \sa pos(), screenPos()
+*/
+QPointF QGraphicsSceneContextMenuEvent::scenePos() const
+{
+    Q_D(const QGraphicsSceneContextMenuEvent);
+    return d->scenePos;
+}
+
+/*!
+    \fn void QGraphicsSceneContextMenuEvent::setScenePos(const QPointF &point)
+    \internal
+
+    Sets the position associated with the context menu to the given \a point
+    in scene coordinates.
+*/
+void QGraphicsSceneContextMenuEvent::setScenePos(const QPointF &pos)
+{
+    Q_D(QGraphicsSceneContextMenuEvent);
+    d->scenePos = pos;
+}
+
+/*!
+    Returns the position of the mouse cursor in screen coordinates at the moment the
+    the context menu was requested.
+
+    \sa pos(), scenePos()
+*/
+QPoint QGraphicsSceneContextMenuEvent::screenPos() const
+{
+    Q_D(const QGraphicsSceneContextMenuEvent);
+    return d->screenPos;
+}
+
+/*!
+    \fn void QGraphicsSceneContextMenuEvent::setScreenPos(const QPoint &point)
+    \internal
+
+    Sets the position associated with the context menu to the given \a point
+    in screen coordinates.
+*/
+void QGraphicsSceneContextMenuEvent::setScreenPos(const QPoint &pos)
+{
+    Q_D(QGraphicsSceneContextMenuEvent);
+    d->screenPos = pos;
+}
+
+/*!
+    Returns the keyboard modifiers in use when the context menu was requested.
+*/
+Qt::KeyboardModifiers QGraphicsSceneContextMenuEvent::modifiers() const
+{
+    Q_D(const QGraphicsSceneContextMenuEvent);
+    return d->modifiers;
+}
+
+/*!
+    \internal
+
+    Sets the keyboard modifiers associated with the context menu to the \a
+    modifiers specified.
+*/
+void QGraphicsSceneContextMenuEvent::setModifiers(Qt::KeyboardModifiers modifiers)
+{
+    Q_D(QGraphicsSceneContextMenuEvent);
+    d->modifiers = modifiers;
+}
+
+/*!
+    Returns the reason for the context menu event.
+
+    \sa QGraphicsSceneContextMenuEvent::Reason
+*/
+QGraphicsSceneContextMenuEvent::Reason QGraphicsSceneContextMenuEvent::reason() const
+{
+    Q_D(const QGraphicsSceneContextMenuEvent);
+    return d->reason;
+}
+
+/*!
+    \internal
+    Sets the reason for the context menu event to \a reason.
+
+    \sa reason()
+*/
+void QGraphicsSceneContextMenuEvent::setReason(Reason reason)
+{
+    Q_D(QGraphicsSceneContextMenuEvent);
+    d->reason = reason;
+}
+
+class QGraphicsSceneHoverEventPrivate : public QGraphicsSceneEventPrivate
+{
+public:
+    QPointF pos;
+    QPointF scenePos;
+    QPoint screenPos;
+    QPointF lastPos;
+    QPointF lastScenePos;
+    QPoint lastScreenPos;
+    Qt::KeyboardModifiers modifiers;
+};
+
+/*!
+    \internal
+
+    Constructs a graphics scene hover event of the specified \a type.
+*/
+QGraphicsSceneHoverEvent::QGraphicsSceneHoverEvent(Type type)
+    : QGraphicsSceneEvent(*new QGraphicsSceneHoverEventPrivate, type)
+{
+}
+
+/*!
+    Destroys the event.
+*/
+QGraphicsSceneHoverEvent::~QGraphicsSceneHoverEvent()
+{
+}
+
+/*!
+    Returns the position of the mouse cursor in item coordinates at the moment
+    the the hover event was sent.
+
+    \sa scenePos(), screenPos()
+*/
+QPointF QGraphicsSceneHoverEvent::pos() const
+{
+    Q_D(const QGraphicsSceneHoverEvent);
+    return d->pos;
+}
+
+/*!
+    \fn void QGraphicsSceneHoverEvent::setPos(const QPointF &point)
+    \internal
+
+    Sets the position associated with the hover event to the given \a point in
+    item coordinates.
+*/
+void QGraphicsSceneHoverEvent::setPos(const QPointF &pos)
+{
+    Q_D(QGraphicsSceneHoverEvent);
+    d->pos = pos;
+}
+
+/*!
+    Returns the position of the mouse cursor in scene coordinates at the
+    moment the the hover event was sent.
+
+    \sa pos(), screenPos()
+*/
+QPointF QGraphicsSceneHoverEvent::scenePos() const
+{
+    Q_D(const QGraphicsSceneHoverEvent);
+    return d->scenePos;
+}
+
+/*!
+    \fn void QGraphicsSceneHoverEvent::setScenePos(const QPointF &point)
+    \internal
+
+    Sets the position associated with the hover event to the given \a point in
+    scene coordinates.
+*/
+void QGraphicsSceneHoverEvent::setScenePos(const QPointF &pos)
+{
+    Q_D(QGraphicsSceneHoverEvent);
+    d->scenePos = pos;
+}
+
+/*!
+    Returns the position of the mouse cursor in screen coordinates at the
+    moment the the hover event was sent.
+
+    \sa pos(), scenePos()
+*/
+QPoint QGraphicsSceneHoverEvent::screenPos() const
+{
+    Q_D(const QGraphicsSceneHoverEvent);
+    return d->screenPos;
+}
+
+/*!
+    \fn void QGraphicsSceneHoverEvent::setScreenPos(const QPoint &point)
+    \internal
+
+    Sets the position associated with the hover event to the given \a point in
+    screen coordinates.
+*/
+void QGraphicsSceneHoverEvent::setScreenPos(const QPoint &pos)
+{
+    Q_D(QGraphicsSceneHoverEvent);
+    d->screenPos = pos;
+}
+
+/*!
+    \since 4.4
+
+    Returns the last recorded mouse cursor position in item coordinates.
+
+    \sa lastScenePos(), lastScreenPos(), pos()
+*/
+QPointF QGraphicsSceneHoverEvent::lastPos() const
+{
+    Q_D(const QGraphicsSceneHoverEvent);
+    return d->lastPos;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsSceneHoverEvent::setLastPos(const QPointF &pos)
+{
+    Q_D(QGraphicsSceneHoverEvent);
+    d->lastPos = pos;
+}
+
+/*!
+    \since 4.4
+
+    Returns the last recorded, the scene coordinates of the previous mouse or
+    hover event received by the view, that created the event mouse cursor
+    position in scene coordinates.
+
+    \sa lastPos(), lastScreenPos(), scenePos()
+*/
+QPointF QGraphicsSceneHoverEvent::lastScenePos() const
+{
+    Q_D(const QGraphicsSceneHoverEvent);
+    return d->lastScenePos;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsSceneHoverEvent::setLastScenePos(const QPointF &pos)
+{
+    Q_D(QGraphicsSceneHoverEvent);
+    d->lastScenePos = pos;
+}
+
+/*!
+    \since 4.4
+
+    Returns the last recorded mouse cursor position in screen coordinates. The
+    last recorded position is the position of the previous mouse or hover
+    event received by the view that created the event.
+
+    \sa lastPos(), lastScenePos(), screenPos()
+*/
+QPoint QGraphicsSceneHoverEvent::lastScreenPos() const
+{
+    Q_D(const QGraphicsSceneHoverEvent);
+    return d->lastScreenPos;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsSceneHoverEvent::setLastScreenPos(const QPoint &pos)
+{
+    Q_D(QGraphicsSceneHoverEvent);
+    d->lastScreenPos = pos;
+}
+
+/*!
+    \since 4.4
+
+    Returns the keyboard modifiers at the moment the the hover event was sent.
+*/
+Qt::KeyboardModifiers QGraphicsSceneHoverEvent::modifiers() const
+{
+    Q_D(const QGraphicsSceneHoverEvent);
+    return d->modifiers;
+}
+
+/*!
+    \fn void QGraphicsSceneHoverEvent::setModifiers(Qt::KeyboardModifiers modifiers)
+    \internal
+
+    Sets the modifiers for the current hover event to \a modifiers.
+*/
+void QGraphicsSceneHoverEvent::setModifiers(Qt::KeyboardModifiers modifiers)
+{
+    Q_D(QGraphicsSceneHoverEvent);
+    d->modifiers = modifiers;
+}
+
+class QGraphicsSceneHelpEventPrivate : public QGraphicsSceneEventPrivate
+{
+public:
+    QPointF scenePos;
+    QPoint screenPos;
+};
+
+/*!
+    \internal
+
+    Constructs a graphics scene help event of the specified \a type.
+*/
+QGraphicsSceneHelpEvent::QGraphicsSceneHelpEvent(Type type)
+    : QGraphicsSceneEvent(*new QGraphicsSceneHelpEventPrivate, type)
+{
+}
+
+/*!
+    Destroys the event.
+*/
+QGraphicsSceneHelpEvent::~QGraphicsSceneHelpEvent()
+{
+}
+
+/*!
+    Returns the position of the mouse cursor in scene coordinates at the
+    moment the the help event was sent.
+
+    \sa screenPos()
+*/
+QPointF QGraphicsSceneHelpEvent::scenePos() const
+{
+    Q_D(const QGraphicsSceneHelpEvent);
+    return d->scenePos;
+}
+
+/*!
+    \fn void QGraphicsSceneHelpEvent::setScenePos(const QPointF &point)
+    \internal
+
+    Sets the position associated with the context menu to the given \a point
+    in scene coordinates.
+*/
+void QGraphicsSceneHelpEvent::setScenePos(const QPointF &pos)
+{
+    Q_D(QGraphicsSceneHelpEvent);
+    d->scenePos = pos;
+}
+
+/*!
+    Returns the position of the mouse cursor in screen coordinates at the
+    moment the the help event was sent.
+
+  \sa scenePos()
+*/
+QPoint QGraphicsSceneHelpEvent::screenPos() const
+{
+    Q_D(const QGraphicsSceneHelpEvent);
+    return d->screenPos;
+}
+
+/*!
+    \fn void QGraphicsSceneHelpEvent::setScreenPos(const QPoint &point)
+    \internal
+
+    Sets the position associated with the context menu to the given \a point
+    in screen coordinates.
+*/
+void QGraphicsSceneHelpEvent::setScreenPos(const QPoint &pos)
+{
+    Q_D(QGraphicsSceneHelpEvent);
+    d->screenPos = pos;
+}
+
+class QGraphicsSceneDragDropEventPrivate : public QGraphicsSceneEventPrivate
+{
+    Q_DECLARE_PUBLIC(QGraphicsSceneDragDropEvent)
+public:
+    inline QGraphicsSceneDragDropEventPrivate()
+        : source(0), mimeData(0)
+    { }
+
+    QPointF pos;
+    QPointF scenePos;
+    QPoint screenPos;
+    Qt::MouseButtons buttons;
+    Qt::KeyboardModifiers modifiers;
+    Qt::DropActions possibleActions;
+    Qt::DropAction proposedAction;
+    Qt::DropAction dropAction;
+    QWidget *source;
+    const QMimeData *mimeData;
+};
+
+/*!
+    \internal
+
+    Constructs a new QGraphicsSceneDragDropEvent of the
+    specified \a type. The type can be either
+    QEvent::GraphicsSceneDragEnter, QEvent::GraphicsSceneDragLeave,
+    QEvent::GraphicsSceneDragMove, or QEvent::GraphicsSceneDrop.
+*/
+QGraphicsSceneDragDropEvent::QGraphicsSceneDragDropEvent(Type type)
+    : QGraphicsSceneEvent(*new QGraphicsSceneDragDropEventPrivate, type)
+{
+}
+
+/*!
+    Destroys the object.
+*/
+QGraphicsSceneDragDropEvent::~QGraphicsSceneDragDropEvent()
+{
+}
+
+/*!
+    Returns the mouse position of the event relative to the
+    view that sent the event.
+    
+    \sa QGraphicsView, screenPos(), scenePos()
+*/
+QPointF QGraphicsSceneDragDropEvent::pos() const
+{
+    Q_D(const QGraphicsSceneDragDropEvent);
+    return d->pos;
+}
+
+/*!
+    \internal
+    Sets the position of the mouse to \a pos; this should be
+    relative to the widget that generated the event, which normally
+    is a QGraphicsView.
+
+    \sa pos(), setScenePos(), setScreenPos()
+*/
+
+void QGraphicsSceneDragDropEvent::setPos(const QPointF &pos)
+{
+    Q_D(QGraphicsSceneDragDropEvent);
+    d->pos = pos;
+}
+
+/*!
+    Returns the position of the mouse in scene coordinates.
+
+    \sa pos(), screenPos()
+*/
+QPointF QGraphicsSceneDragDropEvent::scenePos() const
+{
+    Q_D(const QGraphicsSceneDragDropEvent);
+    return d->scenePos;
+}
+
+/*!
+    \internal
+    Sets the scene position of the mouse to \a pos.
+
+    \sa scenePos(), setScreenPos(), setPos()
+*/
+void QGraphicsSceneDragDropEvent::setScenePos(const QPointF &pos)
+{
+    Q_D(QGraphicsSceneDragDropEvent);
+    d->scenePos = pos;
+}
+
+/*!
+    Returns the position of the mouse relative to the screen.
+
+    \sa pos(), scenePos()
+*/
+QPoint QGraphicsSceneDragDropEvent::screenPos() const
+{
+    Q_D(const QGraphicsSceneDragDropEvent);
+    return d->screenPos;
+}
+
+/*!
+    \internal
+    Sets the mouse position relative to the screen to \a pos.
+
+    \sa screenPos(), setScenePos(), setPos()
+*/
+void QGraphicsSceneDragDropEvent::setScreenPos(const QPoint &pos)
+{
+    Q_D(QGraphicsSceneDragDropEvent);
+    d->screenPos = pos;
+}
+
+/*!
+    Returns a Qt::MouseButtons value indicating which buttons
+    were pressed on the mouse when this mouse event was
+    generated.
+
+    \sa Qt::MouseButtons
+*/
+Qt::MouseButtons QGraphicsSceneDragDropEvent::buttons() const
+{
+    Q_D(const QGraphicsSceneDragDropEvent);
+    return d->buttons;
+}
+
+/*!
+    \internal
+    Sets the mouse buttons that were pressed when the event was
+    created to \a buttons.
+
+    \sa Qt::MouseButtons, buttons()
+*/
+void QGraphicsSceneDragDropEvent::setButtons(Qt::MouseButtons buttons)
+{
+    Q_D(QGraphicsSceneDragDropEvent);
+    d->buttons = buttons;
+}
+
+/*!
+    Returns the keyboard modifiers that were pressed when the drag
+    and drop event was created. 
+
+    \sa Qt::KeyboardModifiers
+*/
+Qt::KeyboardModifiers QGraphicsSceneDragDropEvent::modifiers() const
+{
+    Q_D(const QGraphicsSceneDragDropEvent);
+    return d->modifiers;
+}
+
+/*!
+    \internal
+    Sets the keyboard modifiers that were pressed when the event
+    was created to \a modifiers.
+
+    \sa Qt::KeyboardModifiers, modifiers()
+*/
+
+void QGraphicsSceneDragDropEvent::setModifiers(Qt::KeyboardModifiers modifiers)
+{
+    Q_D(QGraphicsSceneDragDropEvent);
+    d->modifiers = modifiers;
+}
+
+/*!
+    Returns the possible drop actions that the drag and
+    drop can result in.
+
+    \sa Qt::DropActions
+*/
+
+Qt::DropActions QGraphicsSceneDragDropEvent::possibleActions() const
+{
+    Q_D(const QGraphicsSceneDragDropEvent);
+    return d->possibleActions;
+}
+
+/*!
+    \internal
+    Sets the possible drop actions that the drag can
+    result in to \a actions.
+
+    \sa Qt::DropActions, possibleActions()
+*/
+void QGraphicsSceneDragDropEvent::setPossibleActions(Qt::DropActions actions)
+{
+    Q_D(QGraphicsSceneDragDropEvent);
+    d->possibleActions = actions;
+}
+
+/*!
+    Returns the drop action that is proposed, i.e., preferred.
+    The action must be one of the possible actions as defined by
+    \c possibleActions().
+
+    \sa Qt::DropAction, possibleActions()    
+*/
+
+Qt::DropAction QGraphicsSceneDragDropEvent::proposedAction() const
+{
+    Q_D(const QGraphicsSceneDragDropEvent);
+    return d->proposedAction;
+}
+
+/*!
+    \internal
+    Sets the proposed action to \a action. The proposed action
+    is a Qt::DropAction that is one of the possible actions as
+    given by \c possibleActions().
+
+    \sa proposedAction(), Qt::DropAction, possibleActions()
+*/
+
+void QGraphicsSceneDragDropEvent::setProposedAction(Qt::DropAction action)
+{
+    Q_D(QGraphicsSceneDragDropEvent);
+    d->proposedAction = action;
+}
+
+/*!
+    Sets the proposed action as accepted, i.e, the drop action
+    is set to the proposed action. This is equal to:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicssceneevent.cpp 0
+
+    When using this function, one should not call \c accept().
+
+    \sa dropAction(), setDropAction(), proposedAction()
+*/
+
+void QGraphicsSceneDragDropEvent::acceptProposedAction()
+{
+    Q_D(QGraphicsSceneDragDropEvent);
+    d->dropAction = d->proposedAction;
+}
+
+/*!
+    Returns the action that was performed in this drag and drop.
+    This should be set by the receiver of the drop and is
+    returned by QDrag::start().
+
+    \sa setDropAction(), acceptProposedAction()
+*/
+
+Qt::DropAction QGraphicsSceneDragDropEvent::dropAction() const
+{
+    Q_D(const QGraphicsSceneDragDropEvent);
+    return d->dropAction;
+}
+
+/*!
+    This function lets the receiver of the drop set the drop
+    action that was performed to \a action, which should be one
+    of the
+    \l{QGraphicsSceneDragDropEvent::possibleActions()}{possible
+    actions}. Call \c accept() in stead of \c
+    acceptProposedAction() if you use this function.
+
+    \sa dropAction(), accept(), possibleActions()
+*/
+void QGraphicsSceneDragDropEvent::setDropAction(Qt::DropAction action)
+{
+    Q_D(QGraphicsSceneDragDropEvent);
+    d->dropAction = action;
+}
+
+/*!
+    This function returns the QGraphicsView that created the
+    QGraphicsSceneDragDropEvent.
+*/
+QWidget *QGraphicsSceneDragDropEvent::source() const
+{
+    Q_D(const QGraphicsSceneDragDropEvent);
+    return d->source;
+}
+
+/*!
+    \internal
+    This function set the source widget, i.e., the widget that
+    created the drop event, to \a source.
+*/
+void QGraphicsSceneDragDropEvent::setSource(QWidget *source)
+{
+    Q_D(QGraphicsSceneDragDropEvent);
+    d->source = source;
+}
+
+/*!
+    This function returns the MIME data of the event.
+*/
+const QMimeData *QGraphicsSceneDragDropEvent::mimeData() const
+{
+    Q_D(const QGraphicsSceneDragDropEvent);
+    return d->mimeData;
+}
+
+/*!
+    \internal
+    This function sets the MIME data for the event.
+*/
+void QGraphicsSceneDragDropEvent::setMimeData(const QMimeData *data)
+{
+    Q_D(QGraphicsSceneDragDropEvent);
+    d->mimeData = data;
+}
+
+class QGraphicsSceneResizeEventPrivate : public QGraphicsSceneEventPrivate
+{
+    Q_DECLARE_PUBLIC(QGraphicsSceneResizeEvent)
+public:
+    inline QGraphicsSceneResizeEventPrivate()
+    { }
+
+    QSizeF oldSize;
+    QSizeF newSize;
+};
+
+/*!
+    Constructs a QGraphicsSceneResizeEvent.
+*/
+QGraphicsSceneResizeEvent::QGraphicsSceneResizeEvent()
+    : QGraphicsSceneEvent(*new QGraphicsSceneResizeEventPrivate, QEvent::GraphicsSceneResize)
+{
+}
+
+/*!
+    Destroys the QGraphicsSceneResizeEvent.
+*/
+QGraphicsSceneResizeEvent::~QGraphicsSceneResizeEvent()
+{
+}
+
+/*!
+    Returns the old size (i.e., the size immediately before the widget was
+    resized).
+
+    \sa newSize(), QGraphicsWidget::resize()
+*/
+QSizeF QGraphicsSceneResizeEvent::oldSize() const
+{
+    Q_D(const QGraphicsSceneResizeEvent);
+    return d->oldSize;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsSceneResizeEvent::setOldSize(const QSizeF &size)
+{
+    Q_D(QGraphicsSceneResizeEvent);
+    d->oldSize = size;
+}
+
+/*!
+    Returns the new size (i.e., the current size).
+
+    \sa oldSize(), QGraphicsWidget::resize()
+*/
+QSizeF QGraphicsSceneResizeEvent::newSize() const
+{
+    Q_D(const QGraphicsSceneResizeEvent);
+    return d->newSize;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsSceneResizeEvent::setNewSize(const QSizeF &size)
+{
+    Q_D(QGraphicsSceneResizeEvent);
+    d->newSize = size;
+}
+
+class QGraphicsSceneMoveEventPrivate : public QGraphicsSceneEventPrivate
+{
+    Q_DECLARE_PUBLIC(QGraphicsSceneMoveEvent)
+public:
+    inline QGraphicsSceneMoveEventPrivate()
+    { }
+
+    QPointF oldPos;
+    QPointF newPos;
+};
+
+/*!
+    Constructs a QGraphicsSceneMoveEvent.
+*/
+QGraphicsSceneMoveEvent::QGraphicsSceneMoveEvent()
+    : QGraphicsSceneEvent(*new QGraphicsSceneMoveEventPrivate, QEvent::GraphicsSceneMove)
+{
+}
+
+/*!
+    Destroys the QGraphicsSceneMoveEvent.
+*/
+QGraphicsSceneMoveEvent::~QGraphicsSceneMoveEvent()
+{
+}
+
+/*!
+    Returns the old position (i.e., the position immediatly before the widget
+    was moved).
+
+    \sa newPos(), QGraphicsItem::setPos()
+*/
+QPointF QGraphicsSceneMoveEvent::oldPos() const
+{
+    Q_D(const QGraphicsSceneMoveEvent);
+    return d->oldPos;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsSceneMoveEvent::setOldPos(const QPointF &pos)
+{
+    Q_D(QGraphicsSceneMoveEvent);
+    d->oldPos = pos;
+}
+
+/*!
+    Returns the new position (i.e., the current position).
+
+    \sa oldPos(), QGraphicsItem::setPos()
+*/
+QPointF QGraphicsSceneMoveEvent::newPos() const
+{
+    Q_D(const QGraphicsSceneMoveEvent);
+    return d->newPos;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsSceneMoveEvent::setNewPos(const QPointF &pos)
+{
+    Q_D(QGraphicsSceneMoveEvent);
+    d->newPos = pos;
+}
+
+QT_END_NAMESPACE
+
+#endif // QT_NO_GRAPHICSVIEW
diff --git a/src/gui/graphicsview/qgraphicssceneevent.h b/src/gui/graphicsview/qgraphicssceneevent.h
new file mode 100644
index 0000000..be50e96
--- /dev/null
+++ b/src/gui/graphicsview/qgraphicssceneevent.h
@@ -0,0 +1,311 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QGRAPHICSSCENEEVENT_H
+#define QGRAPHICSSCENEEVENT_H
+
+#include <QtCore/qcoreevent.h>
+#include <QtCore/qpoint.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Gui)
+
+#if !defined(QT_NO_GRAPHICSVIEW) || (QT_EDITION & QT_MODULE_GRAPHICSVIEW) != QT_MODULE_GRAPHICSVIEW
+
+class QMimeData;
+class QPointF;
+class QSizeF;
+class QWidget;
+
+class QGraphicsSceneEventPrivate;
+class Q_GUI_EXPORT QGraphicsSceneEvent : public QEvent
+{
+public:
+    QGraphicsSceneEvent(Type type);
+    ~QGraphicsSceneEvent();
+
+    QWidget *widget() const;
+    void setWidget(QWidget *widget);
+
+protected:
+    QGraphicsSceneEvent(QGraphicsSceneEventPrivate &dd, Type type = None);
+    QGraphicsSceneEventPrivate *d_ptr;
+    Q_DECLARE_PRIVATE(QGraphicsSceneEvent)
+};
+
+class QGraphicsSceneMouseEventPrivate;
+class Q_GUI_EXPORT QGraphicsSceneMouseEvent : public QGraphicsSceneEvent
+{
+public:
+    QGraphicsSceneMouseEvent(Type type = None);
+    ~QGraphicsSceneMouseEvent();
+
+    QPointF pos() const;
+    void setPos(const QPointF &pos);
+
+    QPointF scenePos() const;
+    void setScenePos(const QPointF &pos);
+
+    QPoint screenPos() const;
+    void setScreenPos(const QPoint &pos);
+
+    QPointF buttonDownPos(Qt::MouseButton button) const;
+    void setButtonDownPos(Qt::MouseButton button, const QPointF &pos);
+
+    QPointF buttonDownScenePos(Qt::MouseButton button) const;
+    void setButtonDownScenePos(Qt::MouseButton button, const QPointF &pos);
+
+    QPoint buttonDownScreenPos(Qt::MouseButton button) const;
+    void setButtonDownScreenPos(Qt::MouseButton button, const QPoint &pos);
+
+    QPointF lastPos() const;
+    void setLastPos(const QPointF &pos);
+
+    QPointF lastScenePos() const;
+    void setLastScenePos(const QPointF &pos);
+
+    QPoint lastScreenPos() const;
+    void setLastScreenPos(const QPoint &pos);
+
+    Qt::MouseButtons buttons() const;
+    void setButtons(Qt::MouseButtons buttons);
+
+    Qt::MouseButton button() const;
+    void setButton(Qt::MouseButton button);
+
+    Qt::KeyboardModifiers modifiers() const;
+    void setModifiers(Qt::KeyboardModifiers modifiers);
+
+private:
+    Q_DECLARE_PRIVATE(QGraphicsSceneMouseEvent)
+};
+
+class QGraphicsSceneWheelEventPrivate;
+class Q_GUI_EXPORT QGraphicsSceneWheelEvent : public QGraphicsSceneEvent
+{
+public:
+    QGraphicsSceneWheelEvent(Type type = None);
+    ~QGraphicsSceneWheelEvent();
+
+    QPointF pos() const;
+    void setPos(const QPointF &pos);
+
+    QPointF scenePos() const;
+    void setScenePos(const QPointF &pos);
+
+    QPoint screenPos() const;
+    void setScreenPos(const QPoint &pos);
+
+    Qt::MouseButtons buttons() const;
+    void setButtons(Qt::MouseButtons buttons);
+
+    Qt::KeyboardModifiers modifiers() const;
+    void setModifiers(Qt::KeyboardModifiers modifiers);
+
+    int delta() const;
+    void setDelta(int delta);
+
+    Qt::Orientation orientation() const;
+    void setOrientation(Qt::Orientation orientation);
+
+private:
+    Q_DECLARE_PRIVATE(QGraphicsSceneWheelEvent)
+};
+
+class QGraphicsSceneContextMenuEventPrivate;
+class Q_GUI_EXPORT QGraphicsSceneContextMenuEvent : public QGraphicsSceneEvent
+{
+public:
+    enum Reason { Mouse, Keyboard, Other };
+
+    QGraphicsSceneContextMenuEvent(Type type = None);
+    ~QGraphicsSceneContextMenuEvent();
+
+    QPointF pos() const;
+    void setPos(const QPointF &pos);
+
+    QPointF scenePos() const;
+    void setScenePos(const QPointF &pos);
+
+    QPoint screenPos() const;
+    void setScreenPos(const QPoint &pos);
+
+    Qt::KeyboardModifiers modifiers() const;
+    void setModifiers(Qt::KeyboardModifiers modifiers);
+
+    Reason reason() const;
+    void setReason(Reason reason);
+
+private:
+    Q_DECLARE_PRIVATE(QGraphicsSceneContextMenuEvent)
+};
+
+class QGraphicsSceneHoverEventPrivate;
+class Q_GUI_EXPORT QGraphicsSceneHoverEvent : public QGraphicsSceneEvent
+{
+public:
+    QGraphicsSceneHoverEvent(Type type = None);
+    ~QGraphicsSceneHoverEvent();
+
+    QPointF pos() const;
+    void setPos(const QPointF &pos);
+
+    QPointF scenePos() const;
+    void setScenePos(const QPointF &pos);
+
+    QPoint screenPos() const;
+    void setScreenPos(const QPoint &pos);
+
+    QPointF lastPos() const;
+    void setLastPos(const QPointF &pos);
+
+    QPointF lastScenePos() const;
+    void setLastScenePos(const QPointF &pos);
+
+    QPoint lastScreenPos() const;
+    void setLastScreenPos(const QPoint &pos);
+
+    Qt::KeyboardModifiers modifiers() const;
+    void setModifiers(Qt::KeyboardModifiers modifiers);
+
+private:
+    Q_DECLARE_PRIVATE(QGraphicsSceneHoverEvent)
+};
+
+class QGraphicsSceneHelpEventPrivate;
+class Q_GUI_EXPORT QGraphicsSceneHelpEvent : public QGraphicsSceneEvent
+{
+public:
+    QGraphicsSceneHelpEvent(Type type = None);
+    ~QGraphicsSceneHelpEvent();
+
+    QPointF scenePos() const;
+    void setScenePos(const QPointF &pos);
+
+    QPoint screenPos() const;
+    void setScreenPos(const QPoint &pos);
+
+private:
+    Q_DECLARE_PRIVATE(QGraphicsSceneHelpEvent)
+};
+
+class QGraphicsSceneDragDropEventPrivate;
+class Q_GUI_EXPORT QGraphicsSceneDragDropEvent : public QGraphicsSceneEvent
+{
+public:
+    QGraphicsSceneDragDropEvent(Type type = None);
+    ~QGraphicsSceneDragDropEvent();
+
+    QPointF pos() const;
+    void setPos(const QPointF &pos);
+
+    QPointF scenePos() const;
+    void setScenePos(const QPointF &pos);
+
+    QPoint screenPos() const;
+    void setScreenPos(const QPoint &pos);
+
+    Qt::MouseButtons buttons() const;
+    void setButtons(Qt::MouseButtons buttons);
+
+    Qt::KeyboardModifiers modifiers() const;
+    void setModifiers(Qt::KeyboardModifiers modifiers);
+
+    Qt::DropActions possibleActions() const;
+    void setPossibleActions(Qt::DropActions actions);
+
+    Qt::DropAction proposedAction() const;
+    void setProposedAction(Qt::DropAction action);
+    void acceptProposedAction();
+
+    Qt::DropAction dropAction() const;
+    void setDropAction(Qt::DropAction action);
+
+    QWidget *source() const;
+    void setSource(QWidget *source);
+
+    const QMimeData *mimeData() const;
+    void setMimeData(const QMimeData *data);
+
+private:
+    Q_DECLARE_PRIVATE(QGraphicsSceneDragDropEvent)
+};
+
+class QGraphicsSceneResizeEventPrivate;
+class Q_GUI_EXPORT QGraphicsSceneResizeEvent : public QGraphicsSceneEvent
+{
+    Q_DECLARE_PRIVATE(QGraphicsSceneResizeEvent)
+public:
+    QGraphicsSceneResizeEvent();
+    ~QGraphicsSceneResizeEvent();
+
+    QSizeF oldSize() const;
+    void setOldSize(const QSizeF &size);
+
+    QSizeF newSize() const;
+    void setNewSize(const QSizeF &size);
+};
+
+class QGraphicsSceneMoveEventPrivate;
+class Q_GUI_EXPORT QGraphicsSceneMoveEvent : public QGraphicsSceneEvent
+{
+    Q_DECLARE_PRIVATE(QGraphicsSceneMoveEvent)
+public:
+    QGraphicsSceneMoveEvent();
+    ~QGraphicsSceneMoveEvent();
+
+    QPointF oldPos() const;
+    void setOldPos(const QPointF &pos);
+
+    QPointF newPos() const;
+    void setNewPos(const QPointF &pos);
+};
+
+#endif // QT_NO_GRAPHICSVIEW
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif
diff --git a/src/gui/graphicsview/qgraphicsview.cpp b/src/gui/graphicsview/qgraphicsview.cpp
new file mode 100644
index 0000000..15c0e25
--- /dev/null
+++ b/src/gui/graphicsview/qgraphicsview.cpp
@@ -0,0 +1,3887 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//#define QGRAPHICSVIEW_DEBUG
+
+static const int QGRAPHICSVIEW_REGION_RECT_THRESHOLD = 50;
+
+static const int QGRAPHICSVIEW_PREALLOC_STYLE_OPTIONS = 503; // largest prime < 2^9
+
+/*!
+    \class QGraphicsView
+    \brief The QGraphicsView class provides a widget for displaying the
+    contents of a QGraphicsScene.
+    \since 4.2
+    \ingroup multimedia
+    \ingroup graphicsview-api
+    \mainclass
+
+    QGraphicsView visualizes the contents of a QGraphicsScene in a scrollable
+    viewport. To create a scene with geometrical items, see QGraphicsScene's
+    documentation. QGraphicsView is part of \l{The Graphics View Framework}.
+
+    To visualize a scene, you start by constructing a QGraphicsView object,
+    passing the address of the scene you want to visualize to QGraphicsView's
+    constructor. Alternatively, you can call setScene() to set the scene at a
+    later point. After you call show(), the view will by default scroll to the
+    center of the scene and display any items that are visible at this
+    point. For example:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsview.cpp 0
+
+    You can explicitly scroll to any position on the scene by using the
+    scroll bars, or by calling centerOn(). By passing a point to centerOn(),
+    QGraphicsView will scroll its viewport to ensure that the point is
+    centered in the view. An overload is provided for scrolling to a
+    QGraphicsItem, in which case QGraphicsView will see to that the center of
+    the item is centered in the view. If all you want is to ensure that a
+    certain area is visible, (but not necessarily centered,) you can call
+    ensureVisible() instead.
+
+    QGraphicsView can be used to visualize a whole scene, or only parts of it.
+    The visualized area is by default detected automatically when the view is
+    displayed for the first time (by calling
+    QGraphicsScene::itemsBoundingRect()). To set the visualized area rectangle
+    yourself, you can call setSceneRect(). This will adjust the scroll bars'
+    ranges appropriately. Note that although the scene supports a virtually
+    unlimited size, the range of the scroll bars will never exceed the range of
+    an integer (INT_MIN, INT_MAX). When the scene is larger than the scroll
+    bars' values, you can choose to use translate() to navigate the scene
+    instead.
+
+    QGraphicsView visualizes the scene by calling render(). By default, the
+    items are drawn onto the viewport by using a regular QPainter, and using
+    default render hints. To change the default render hints that
+    QGraphicsView passes to QPainter when painting items, you can call
+    setRenderHints().
+
+    By default, QGraphicsView provides a regular QWidget for the viewport
+    widget. You can access this widget by calling viewport(), or you can
+    replace it by calling setViewport(). To render using OpenGL, simply call
+    setViewport(new QGLWidget). QGraphicsView takes ownership of the viewport
+    widget.
+
+    QGraphicsView supports affine transformations, using QMatrix. You can
+    either pass a matrix to setMatrix(), or you can call one of the
+    convenience functions rotate(), scale(), translate() or shear(). The most
+    two common transformations are scaling, which is used to implement
+    zooming, and rotation. QGraphicsView keeps the center of the view fixed
+    during a transformation.
+
+    You can interact with the items on the scene by using the mouse and
+    keyboard. QGraphicsView translates the mouse and key events into \e scene
+    events, (events that inherit QGraphicsSceneEvent,), and forward them to
+    the visualized scene. In the end, it's the individual item that handles
+    the events and reacts to them. For example, if you click on a selectable
+    item, the item will typically let the scene know that it has been
+    selected, and it will also redraw itself to display a selection
+    rectangle. Similiary, if you click and drag the mouse to move a movable
+    item, it's the item that handles the mouse moves and moves itself.  Item
+    interaction is enabled by default, and you can toggle it by calling
+    setInteractive().
+
+    You can also provide your own custom scene interaction, by creating a
+    subclass of QGraphicsView, and reimplementing the mouse and key event
+    handlers. To simplify how you programmatically interact with items in the
+    view, QGraphicsView provides the mapping functions mapToScene() and
+    mapFromScene(), and the item accessors items() and itemAt(). These
+    functions allow you to map points, rectangles, polygons and paths between
+    view coordinates and scene coordinates, and to find items on the scene
+    using view coordinates.
+
+    \img graphicsview-view.png
+
+    \sa QGraphicsScene, QGraphicsItem, QGraphicsSceneEvent
+*/
+
+/*!
+    \enum QGraphicsView::ViewportAnchor
+
+    This enums describe the possible anchors that QGraphicsView can
+    use when the user resizes the view or when the view is
+    transformed.
+
+    \value NoAnchor No anchor, i.e. the view leaves the scene's
+                    position unchanged.
+    \value AnchorViewCenter The scene point at the center of the view
+                            is used as the anchor.
+    \value AnchorUnderMouse The point under the mouse is used as the anchor.
+
+    \sa resizeAnchor, transformationAnchor
+*/
+
+/*!
+    \enum QGraphicsView::ViewportUpdateMode
+
+    \since 4.3
+
+    This enum describes how QGraphicsView updates its viewport when the scene
+    contents change or are exposed.
+
+    \value FullViewportUpdate When any visible part of the scene changes or is
+    reexposed, QGraphicsView will update the entire viewport. This approach is
+    fastest when QGraphicsView spends more time figuring out what to draw than
+    it would spend drawing (e.g., when very many small items are repeatedly
+    updated). This is the preferred update mode for viewports that do not
+    support partial updates, such as QGLWidget, and for viewports that need to
+    disable scroll optimization.
+
+    \value MinimalViewportUpdate QGraphicsView will determine the minimal
+    viewport region that requires a redraw, minimizing the time spent drawing
+    by avoiding a redraw of areas that have not changed. This is
+    QGraphicsView's default mode. Although this approach provides the best
+    performance in general, if there are many small visible changes on the
+    scene, QGraphicsView might end up spending more time finding the minimal
+    approach than it will spend drawing.
+
+    \value SmartViewportUpdate QGraphicsView will attempt to find an optimal
+    update mode by analyzing the areas that require a redraw.
+
+    \value BoundingRectViewportUpdate The bounding rectangle of all changes in
+    the viewport will be redrawn. This mode has the advantage that
+    QGraphicsView searches only one region for changes, minimizing time spent
+    determining what needs redrawing. The disadvantage is that areas that have
+    not changed also need to be redrawn.
+
+    \value NoViewportUpdate QGraphicsView will never update its viewport when
+    the scene changes; the user is expected to control all updates. This mode
+    disables all (potentially slow) item visibility testing in QGraphicsView,
+    and is suitable for scenes that either require a fixed frame rate, or where
+    the viewport is otherwise updated externally.
+
+    \sa viewportUpdateMode
+*/
+
+/*!
+    \enum QGraphicsView::OptimizationFlag
+
+    \since 4.3
+
+    This enum describes flags that you can enable to improve rendering
+    performance in QGraphicsView. By default, none of these flags are set.
+    Note that setting a flag usually imposes a side effect, and this effect
+    can vary between paint devices and platforms.
+
+    \value DontClipPainter QGraphicsView sometimes clips the painter when
+    rendering the scene contents. This can generally improve performance
+    (e.g., rendering only small parts of a large pixmap), and protects against
+    rendering mistakes (e.g., drawing outside bounding rectangles, or outside
+    the exposed area). In some situations, however, the painter clip can slow
+    down rendering; especially when all painting is restricted to inside
+    exposed areas. By enabling this flag, QGraphicsView will completely
+    disable its implicit clipping. Note that rendering artifacts from using a
+    semi-transparent foreground or background brush can occur if clipping is
+    disabled.
+
+    \value DontSavePainterState When rendering, QGraphicsView protects the
+    painter state (see QPainter::save()) when rendering the background or
+    foreground, and when rendering each item. This allows you to leave the
+    painter in an altered state (i.e., you can call QPainter::setPen() or
+    QPainter::setBrush() without restoring the state after painting). However,
+    if the items consistently do restore the state, you should enable this
+    flag to prevent QGraphicsView from doing the same.
+
+    \value DontAdjustForAntialiasing Disables QGraphicsView's antialiasing
+    auto-adjustment of exposed areas. Items that render antialiased lines on
+    the boundaries of their QGraphicsItem::boundingRect() can end up rendering
+    parts of the line outside. To prevent rendering artifacts, QGraphicsView
+    expands all exposed regions by 2 pixels in all directions. If you enable
+    this flag, QGraphicsView will no longer perform these adjustments,
+    minimizing the areas that require redrawing, which improves performance. A
+    common side effect is that items that do draw with antialiasing can leave
+    painting traces behind on the scene as they are moved.
+*/
+
+/*!
+    \enum QGraphicsView::CacheModeFlag
+
+    This enum describes the flags that you can set for a QGraphicsView's cache
+    mode.
+
+    \value CacheNone All painting is done directly onto the viewport.
+
+    \value CacheBackground The background is cached. This affects both custom
+    backgrounds, and backgrounds based on the backgroundBrush property. When
+    this flag is enabled, QGraphicsView will allocate one pixmap with the full
+    size of the viewport.
+
+    \sa cacheMode
+*/
+
+/*!
+    \enum QGraphicsView::DragMode
+
+    This enum describes the default action for the view when pressing and
+    dragging the mouse over the viewport.
+
+    \value NoDrag Nothing happens; the mouse event is ignored.
+
+    \value ScrollHandDrag The cursor changes into a pointing hand, and
+    dragging the mouse around will scroll the scrolbars. This mode works both
+    in \l{QGraphicsView::interactive}{interactive} and non-interactive mode.
+
+    \value RubberBandDrag A rubber band will appear. Dragging the mouse will
+    set the rubber band geometry, and all items covered by the rubber band are
+    selected. This mode is disabled for non-interactive views.
+
+    \sa dragMode, QGraphicsScene::setSelectionArea()
+*/
+
+#include "qgraphicsview.h"
+#include "qgraphicsview_p.h"
+
+#ifndef QT_NO_GRAPHICSVIEW
+
+#include "qgraphicsitem.h"
+#include "qgraphicsitem_p.h"
+#include "qgraphicsscene.h"
+#include "qgraphicsscene_p.h"
+#include "qgraphicssceneevent.h"
+#include "qgraphicswidget.h"
+
+#include <QtCore/qdatetime.h>
+#include <QtCore/qdebug.h>
+#include <QtCore/qmath.h>
+#include <QtGui/qapplication.h>
+#include <QtGui/qdesktopwidget.h>
+#include <QtGui/qevent.h>
+#include <QtGui/qlayout.h>
+#include <QtGui/qtransform.h>
+#include <QtGui/qmatrix.h>
+#include <QtGui/qpainter.h>
+#include <QtGui/qscrollbar.h>
+#include <QtGui/qstyleoption.h>
+#ifdef Q_WS_X11
+#include <private/qt_x11_p.h>
+#endif
+
+QT_BEGIN_NAMESPACE
+
+inline int q_round_bound(qreal d) //### (int)(qreal) INT_MAX != INT_MAX for single precision
+{
+    if (d <= (qreal) INT_MIN)
+        return INT_MIN;
+    else if (d >= (qreal) INT_MAX)
+        return INT_MAX;
+    return d >= 0.0 ? int(d + 0.5) : int(d - int(d-1) + 0.5) + int(d-1);
+}
+
+/*!
+    \internal
+*/
+QGraphicsViewPrivate::QGraphicsViewPrivate()
+    : renderHints(QPainter::TextAntialiasing),
+      dragMode(QGraphicsView::NoDrag),
+      sceneInteractionAllowed(true), hasSceneRect(false),
+      connectedToScene(false),
+      mousePressButton(Qt::NoButton),
+      identityMatrix(true),
+      dirtyScroll(true),
+      accelerateScrolling(true),
+      leftIndent(0), topIndent(0),
+      lastMouseEvent(QEvent::None, QPoint(), Qt::NoButton, 0, 0),
+      useLastMouseEvent(false),
+      keepLastCenterPoint(true),
+      alignment(Qt::AlignCenter),
+      transforming(false),
+      transformationAnchor(QGraphicsView::AnchorViewCenter), resizeAnchor(QGraphicsView::NoAnchor),
+      viewportUpdateMode(QGraphicsView::MinimalViewportUpdate),
+      optimizationFlags(0),
+      scene(0),
+#ifndef QT_NO_RUBBERBAND
+      rubberBanding(false),
+      rubberBandSelectionMode(Qt::IntersectsItemShape),
+#endif
+      handScrolling(false), handScrollMotions(0), cacheMode(0),
+      mustAllocateStyleOptions(false),
+      mustResizeBackgroundPixmap(true),
+#ifndef QT_NO_CURSOR
+      hasStoredOriginalCursor(false),
+#endif
+      lastDragDropEvent(0),
+      fullUpdatePending(true),
+      dirtyRectCount(0),
+      updatingLater(false),
+      updateSceneSlotReimplementedChecked(false)
+{
+    styleOptions.reserve(QGRAPHICSVIEW_PREALLOC_STYLE_OPTIONS);
+}
+
+/*!
+    \internal
+*/
+void QGraphicsViewPrivate::recalculateContentSize()
+{
+    Q_Q(QGraphicsView);
+
+    QSize maxSize = q->maximumViewportSize();
+    int width = maxSize.width();
+    int height = maxSize.height();
+    QRectF viewRect = matrix.mapRect(q->sceneRect());
+
+    bool frameOnlyAround = (q->style()->styleHint(QStyle::SH_ScrollView_FrameOnlyAroundContents, 0, q));
+    if (frameOnlyAround) {
+        if (hbarpolicy == Qt::ScrollBarAlwaysOn)
+            height -= frameWidth * 2;
+        if (vbarpolicy == Qt::ScrollBarAlwaysOn)
+            width -= frameWidth * 2;
+    }
+
+    // Adjust the maximum width and height of the viewport based on the width
+    // of visible scroll bars.
+    int scrollBarExtent = q->style()->pixelMetric(QStyle::PM_ScrollBarExtent, 0, q);
+    if (frameOnlyAround)
+        scrollBarExtent += frameWidth * 2;
+
+    bool useHorizontalScrollBar = (viewRect.width() > width) && hbarpolicy != Qt::ScrollBarAlwaysOff;
+    bool useVerticalScrollBar = (viewRect.height() > height) && vbarpolicy != Qt::ScrollBarAlwaysOff;
+    if (useHorizontalScrollBar && !useVerticalScrollBar) {
+        if (viewRect.height() > height - scrollBarExtent)
+            useVerticalScrollBar = true;
+    }
+    if (useVerticalScrollBar && !useHorizontalScrollBar) {
+        if (viewRect.width() > width - scrollBarExtent)
+            useHorizontalScrollBar = true;
+    }
+    if (useHorizontalScrollBar && hbarpolicy != Qt::ScrollBarAlwaysOn)
+        height -= scrollBarExtent;
+    if (useVerticalScrollBar && vbarpolicy != Qt::ScrollBarAlwaysOn)
+        width -= scrollBarExtent;
+
+    // Setting the ranges of these scroll bars can/will cause the values to
+    // change, and scrollContentsBy() will be called correspondingly. This
+    // will reset the last center point.
+    QPointF savedLastCenterPoint = lastCenterPoint;
+
+    // Remember the former indent settings
+    qreal oldLeftIndent = leftIndent;
+    qreal oldTopIndent = topIndent;
+
+    // If the whole scene fits horizontally, we center the scene horizontally,
+    // and ignore the horizontal scroll bars.
+    int left =  q_round_bound(viewRect.left());
+    int right = q_round_bound(viewRect.right() - width);
+    if (left >= right) {
+        q->horizontalScrollBar()->setRange(0, 0);
+
+        switch (alignment & Qt::AlignHorizontal_Mask) {
+        case Qt::AlignLeft:
+            leftIndent = -viewRect.left();
+            break;
+        case Qt::AlignRight:
+            leftIndent = width - viewRect.width() - viewRect.left() - 1;
+            break;
+        case Qt::AlignHCenter:
+        default:
+            leftIndent = width / 2 - (viewRect.left() + viewRect.right()) / 2;
+            break;
+        }
+    } else {
+        q->horizontalScrollBar()->setRange(left, right);
+        q->horizontalScrollBar()->setPageStep(width);
+        q->horizontalScrollBar()->setSingleStep(width / 20);
+        leftIndent = 0;
+    }
+
+    // If the whole scene fits vertically, we center the scene vertically, and
+    // ignore the vertical scroll bars.
+    int top = q_round_bound(viewRect.top());
+    int bottom = q_round_bound(viewRect.bottom()  - height);
+    if (top >= bottom) {
+        q->verticalScrollBar()->setRange(0, 0);
+
+        switch (alignment & Qt::AlignVertical_Mask) {
+        case Qt::AlignTop:
+            topIndent = -viewRect.top();
+            break;
+        case Qt::AlignBottom:
+            topIndent = height - viewRect.height() - viewRect.top() - 1;
+            break;
+        case Qt::AlignVCenter:
+        default:
+            topIndent = height / 2 - (viewRect.top() + viewRect.bottom()) / 2;
+            break;
+        }
+    } else {
+        q->verticalScrollBar()->setRange(top, bottom);
+        q->verticalScrollBar()->setPageStep(height);
+        q->verticalScrollBar()->setSingleStep(height / 20);
+        topIndent = 0;
+    }
+
+    // Restorethe center point from before the ranges changed.
+    lastCenterPoint = savedLastCenterPoint;
+
+    // Issue a full update if the indents change.
+    // ### If the transform is still the same, we can get away with just a
+    // scroll instead.
+    if (oldLeftIndent != leftIndent || oldTopIndent != topIndent) {
+        dirtyScroll = true;
+        q->viewport()->update();
+    } else if (q->isRightToLeft() && !leftIndent) {
+        // In reverse mode, the horizontal scroll always changes after the content
+        // size has changed, as the scroll is calculated by summing the min and
+        // max values of the range and subtracting the current value. In normal
+        // mode the scroll remains unchanged unless the indent has changed.
+        dirtyScroll = true;
+    }
+
+    if (cacheMode & QGraphicsView::CacheBackground) {
+        // Invalidate the background pixmap
+        mustResizeBackgroundPixmap = true;
+    }
+}
+
+/*!
+    \internal
+*/
+void QGraphicsViewPrivate::centerView(QGraphicsView::ViewportAnchor anchor)
+{
+    Q_Q(QGraphicsView);
+    switch (anchor) {
+    case QGraphicsView::AnchorUnderMouse: {
+        if (q->underMouse()) {
+            // Last scene pos: lastMouseMoveScenePoint
+            // Current mouse pos:
+            QPointF transformationDiff = q->mapToScene(q->viewport()->rect().center())
+                                         - q->mapToScene(q->mapFromGlobal(QCursor::pos()));
+            q->centerOn(lastMouseMoveScenePoint + transformationDiff);;
+        } else {
+            q->centerOn(lastCenterPoint);
+        }
+        break;
+    }
+    case QGraphicsView::AnchorViewCenter:
+        q->centerOn(lastCenterPoint);
+        break;
+    case QGraphicsView::NoAnchor:
+        break;
+    }
+}
+
+/*!
+    \internal
+*/
+void QGraphicsViewPrivate::updateLastCenterPoint()
+{
+    Q_Q(QGraphicsView);
+    lastCenterPoint = q->mapToScene(q->viewport()->rect().center());
+}
+
+/*!
+    \internal
+
+    Returns the horizontal scroll value (the X value of the left edge of the
+    viewport).
+*/
+qint64 QGraphicsViewPrivate::horizontalScroll() const
+{
+    if (dirtyScroll)
+        const_cast<QGraphicsViewPrivate *>(this)->updateScroll();
+    return scrollX;
+}
+
+/*!
+    \internal
+
+    Returns the vertical scroll value (the X value of the top edge of the
+    viewport).
+*/
+qint64 QGraphicsViewPrivate::verticalScroll() const
+{
+    if (dirtyScroll)
+        const_cast<QGraphicsViewPrivate *>(this)->updateScroll();
+    return scrollY;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsViewPrivate::updateScroll()
+{
+    Q_Q(QGraphicsView);
+    scrollX = qint64(-leftIndent);
+    if (q->isRightToLeft()) {
+        if (!leftIndent) {
+            scrollX += q->horizontalScrollBar()->minimum();
+            scrollX += q->horizontalScrollBar()->maximum();
+            scrollX -= q->horizontalScrollBar()->value();
+        }
+    } else {
+        scrollX += q->horizontalScrollBar()->value();
+    }
+
+    scrollY = qint64(q->verticalScrollBar()->value() - topIndent);
+
+    dirtyScroll = false;
+}
+
+/*!
+    \internal
+*/
+void QGraphicsViewPrivate::replayLastMouseEvent()
+{
+    if (!useLastMouseEvent || !scene)
+        return;
+    mouseMoveEventHandler(&lastMouseEvent);
+}
+
+/*!
+    \internal
+*/
+void QGraphicsViewPrivate::storeMouseEvent(QMouseEvent *event)
+{
+    useLastMouseEvent = true;
+    lastMouseEvent = QMouseEvent(QEvent::MouseMove, event->pos(), event->globalPos(),
+                                 event->button(), event->buttons(), event->modifiers());
+}
+
+void QGraphicsViewPrivate::mouseMoveEventHandler(QMouseEvent *event)
+{
+    Q_Q(QGraphicsView);
+
+    storeMouseEvent(event);
+    lastMouseEvent.setAccepted(false);
+
+    if (!sceneInteractionAllowed)
+        return;
+    if (handScrolling)
+        return;
+    if (!scene)
+        return;
+
+    QGraphicsSceneMouseEvent mouseEvent(QEvent::GraphicsSceneMouseMove);
+    mouseEvent.setWidget(q->viewport());
+    mouseEvent.setButtonDownScenePos(mousePressButton, mousePressScenePoint);
+    mouseEvent.setButtonDownScreenPos(mousePressButton, mousePressScreenPoint);
+    mouseEvent.setScenePos(q->mapToScene(event->pos()));
+    mouseEvent.setScreenPos(event->globalPos());
+    mouseEvent.setLastScenePos(lastMouseMoveScenePoint);
+    mouseEvent.setLastScreenPos(lastMouseMoveScreenPoint);
+    mouseEvent.setButtons(event->buttons());
+    mouseEvent.setButton(event->button());
+    mouseEvent.setModifiers(event->modifiers());
+    lastMouseMoveScenePoint = mouseEvent.scenePos();
+    lastMouseMoveScreenPoint = mouseEvent.screenPos();
+    mouseEvent.setAccepted(false);
+    QApplication::sendEvent(scene, &mouseEvent);
+
+    // Remember whether the last event was accepted or not.
+    lastMouseEvent.setAccepted(mouseEvent.isAccepted());
+
+    if (mouseEvent.isAccepted() && mouseEvent.buttons() != 0) {
+        // The event was delivered to a mouse grabber; the press is likely to
+        // have set a cursor, and we must not change it.
+        return;
+    }
+
+#ifndef QT_NO_CURSOR
+    // Find the topmost item under the mouse with a cursor.
+    foreach (QGraphicsItem *item, scene->d_func()->cachedItemsUnderMouse) {
+        if (item->hasCursor()) {
+            _q_setViewportCursor(item->cursor());
+            return;
+        }
+    }
+
+    // No items with cursors found; revert to the view cursor.
+    if (hasStoredOriginalCursor) {
+        // Restore the original viewport cursor.
+        hasStoredOriginalCursor = false;
+        q->viewport()->setCursor(originalCursor);
+    }
+#endif
+}
+
+/*!
+    \internal
+*/
+#ifndef QT_NO_RUBBERBAND
+QRegion QGraphicsViewPrivate::rubberBandRegion(const QWidget *widget, const QRect &rect) const
+{
+    QStyleHintReturnMask mask;
+    QStyleOptionRubberBand option;
+    option.initFrom(widget);
+    option.rect = rect;
+    option.opaque = false;
+    option.shape = QRubberBand::Rectangle;
+
+    QRegion tmp;
+    tmp += rect;
+    if (widget->style()->styleHint(QStyle::SH_RubberBand_Mask, &option, widget, &mask))
+        tmp &= mask.region;
+    return tmp;
+}
+#endif
+
+/*!
+    \internal
+*/
+#ifndef QT_NO_CURSOR
+void QGraphicsViewPrivate::_q_setViewportCursor(const QCursor &cursor)
+{
+    Q_Q(QGraphicsView);
+    QWidget *viewport = q->viewport();
+    if (!hasStoredOriginalCursor) {
+        hasStoredOriginalCursor = true;
+        originalCursor = viewport->cursor();
+    }
+    viewport->setCursor(cursor);
+}
+#endif
+
+/*!
+    \internal
+*/
+#ifndef QT_NO_CURSOR
+void QGraphicsViewPrivate::_q_unsetViewportCursor()
+{
+    Q_Q(QGraphicsView);
+    foreach (QGraphicsItem *item, q->items(lastMouseEvent.pos())) {
+        if (item->hasCursor()) {
+            _q_setViewportCursor(item->cursor());
+            return;
+        }
+    }
+
+    // Restore the original viewport cursor.
+    hasStoredOriginalCursor = false;
+    if (dragMode == QGraphicsView::ScrollHandDrag)
+        q->viewport()->setCursor(Qt::OpenHandCursor);
+    else
+        q->viewport()->setCursor(originalCursor);
+}
+#endif
+
+/*!
+    \internal
+*/
+void QGraphicsViewPrivate::storeDragDropEvent(const QGraphicsSceneDragDropEvent *event)
+{
+    delete lastDragDropEvent;
+    lastDragDropEvent = new QGraphicsSceneDragDropEvent(event->type());
+    lastDragDropEvent->setScenePos(event->scenePos());
+    lastDragDropEvent->setScreenPos(event->screenPos());
+    lastDragDropEvent->setButtons(event->buttons());
+    lastDragDropEvent->setModifiers(event->modifiers());
+    lastDragDropEvent->setPossibleActions(event->possibleActions());
+    lastDragDropEvent->setProposedAction(event->proposedAction());
+    lastDragDropEvent->setDropAction(event->dropAction());
+    lastDragDropEvent->setMimeData(event->mimeData());
+    lastDragDropEvent->setWidget(event->widget());
+    lastDragDropEvent->setSource(event->source());
+}
+
+/*!
+    \internal
+*/
+void QGraphicsViewPrivate::populateSceneDragDropEvent(QGraphicsSceneDragDropEvent *dest,
+                                                      QDropEvent *source)
+{
+#ifndef QT_NO_DRAGANDDROP
+    Q_Q(QGraphicsView);
+    dest->setScenePos(q->mapToScene(source->pos()));
+    dest->setScreenPos(q->mapToGlobal(source->pos()));
+    dest->setButtons(source->mouseButtons());
+    dest->setModifiers(source->keyboardModifiers());
+    dest->setPossibleActions(source->possibleActions());
+    dest->setProposedAction(source->proposedAction());
+    dest->setDropAction(source->dropAction());
+    dest->setMimeData(source->mimeData());
+    dest->setWidget(q->viewport());
+    dest->setSource(source->source());
+#else
+    Q_UNUSED(dest)
+    Q_UNUSED(source)
+#endif
+}
+
+/*!
+    \internal
+*/
+QRect QGraphicsViewPrivate::mapToViewRect(const QGraphicsItem *item, const QRectF &rect) const
+{
+    Q_Q(const QGraphicsView);
+    if (dirtyScroll)
+        const_cast<QGraphicsViewPrivate *>(this)->updateScroll();
+
+    if (item->d_ptr->itemIsUntransformable()) {
+        QTransform itv = item->deviceTransform(q->viewportTransform());
+        return itv.mapRect(rect).toAlignedRect();
+    }
+
+    // Translate-only
+    QPointF offset;
+    const QGraphicsItem *parentItem = item;
+    const QGraphicsItemPrivate *itemd;
+    do {
+        itemd = parentItem->d_ptr;
+        if (itemd->hasTransform)
+            break;
+        offset += itemd->pos;
+    } while ((parentItem = itemd->parent));
+
+    QRectF baseRect = rect.translated(offset.x(), offset.y());
+    if (!parentItem) {
+        if (identityMatrix) {
+            baseRect.translate(-scrollX, -scrollY);
+            return baseRect.toAlignedRect();
+        }
+        return matrix.mapRect(baseRect).translated(-scrollX, -scrollY).toAlignedRect();
+    }
+
+    QTransform tr = parentItem->sceneTransform();
+    if (!identityMatrix)
+        tr *= matrix;
+    QRectF r = tr.mapRect(baseRect);
+    r.translate(-scrollX, -scrollY);
+    return r.toAlignedRect();
+}
+
+/*!
+    \internal
+*/
+QRegion QGraphicsViewPrivate::mapToViewRegion(const QGraphicsItem *item, const QRectF &rect) const
+{
+    Q_Q(const QGraphicsView);
+    if (dirtyScroll)
+        const_cast<QGraphicsViewPrivate *>(this)->updateScroll();
+
+    // Accurate bounding region
+    QTransform itv = item->sceneTransform() * q->viewportTransform();
+    return item->boundingRegion(itv) & itv.mapRect(rect).toAlignedRect();
+}
+
+/*!
+    \internal
+*/
+void QGraphicsViewPrivate::itemUpdated(QGraphicsItem *item, const QRectF &rect)
+{
+    if (fullUpdatePending || viewportUpdateMode == QGraphicsView::NoViewportUpdate)
+        return;
+    if (item->d_ptr->dirty)
+        updateLater();
+
+    QRectF updateRect = rect;
+    if (item->isClipped()) {
+        // Minimize unnecessary redraw.
+        QGraphicsItem *p = item;
+        while ((p = p->d_ptr->parent)) {
+            if (p->flags() & QGraphicsItem::ItemClipsChildrenToShape) {
+                updateRect &= p->itemTransform(item).mapRect(p->boundingRect());
+                if (updateRect.isNull())
+                    return;
+            }
+
+            if (!(p->d_ptr->ancestorFlags & QGraphicsItemPrivate::AncestorClipsChildren))
+                break;
+        }
+
+        if (updateRect.isNull())
+            return;
+    }
+
+    // Map the rect to view coordinates.
+    QRect vr = viewport->rect();
+
+    if (!item->d_ptr->hasBoundingRegionGranularity) {
+        QRect r = mapToViewRect(item, updateRect) & vr;
+        if (r.isNull())
+            return;
+        this->updateRect(r);
+    } else {
+        QRegion r = mapToViewRegion(item, updateRect) & vr;
+        if (r.isEmpty())
+            return;
+        updateRegion(r);
+    }
+}
+
+void QGraphicsViewPrivate::updateLater()
+{
+    Q_Q(QGraphicsView);
+    if (updatingLater)
+        return;
+    updatingLater = true;
+    QMetaObject::invokeMethod(q, "_q_updateLaterSlot", Qt::QueuedConnection);
+}
+
+void QGraphicsViewPrivate::_q_updateLaterSlot()
+{
+    Q_Q(QGraphicsView);
+    if (!scene)
+        return;
+
+    QRect vr = viewport->rect();
+    QTransform viewTransform = q->viewportTransform();
+    const QList<QGraphicsItem *> &dirtyItems = scene->d_func()->dirtyItems;
+    for (int i = 0; i < dirtyItems.size(); ++i) {
+        const QGraphicsItem *item = dirtyItems.at(i);
+        QTransform x = item->sceneTransform() * viewTransform;
+        QRect viewRect = x.mapRect(item->boundingRect()).toAlignedRect() & vr;
+        if (!viewRect.isNull())
+            updateRect(viewRect);
+    }
+
+    dirtyRectCount += dirtyRects.size();
+
+    bool noUpdate = !fullUpdatePending && viewportUpdateMode == QGraphicsView::FullViewportUpdate;
+    if ((dirtyRectCount > 0 || !dirtyBoundingRect.isNull()) && !fullUpdatePending && !noUpdate) {
+        if (viewportUpdateMode == QGraphicsView::BoundingRectViewportUpdate
+            || (viewportUpdateMode == QGraphicsView::SmartViewportUpdate
+                && dirtyRectCount >= QGRAPHICSVIEW_REGION_RECT_THRESHOLD)) {
+            if (!(optimizationFlags & QGraphicsView::DontAdjustForAntialiasing)) {
+                viewport->update(dirtyBoundingRect.adjusted(-2, -2, 2, 2));
+            } else {
+                viewport->update(dirtyBoundingRect);
+            }
+        } else {
+            // ### Improve this block, which is very slow for complex regions. We
+            // need to strike the balance between having an accurate update
+            // region, and running fast. The below approach is the simplest way to
+            // create a region from a bunch of rects, but we might want to use
+            // other approaches; e.g., a grid of a fixed size representing
+            // quadrants of the viewport, which we mark as dirty depending on the
+            // rectangles in the list. Perhaps this should go into a
+            // QRegion::fromRects(rects, how) function.
+            QRegion region;
+            if (!(optimizationFlags & QGraphicsView::DontAdjustForAntialiasing)) {
+                for (int i = 0; i < dirtyRegions.size(); ++i) {
+                    QVector<QRect> rects = dirtyRegions.at(i).rects();
+                    for (int j = 0; j < rects.size(); ++j)
+                        region += rects.at(j).adjusted(-2, -2, 2, 2);
+                }
+                for (int i = 0; i < dirtyRects.size(); ++i)
+                    region += dirtyRects.at(i).adjusted(-2, -2, 2, 2);
+            } else {
+                for (int i = 0; i < dirtyRegions.size(); ++i)
+                    region += dirtyRegions.at(i);
+                for (int i = 0; i < dirtyRects.size(); ++i)
+                    region += dirtyRects.at(i);
+            }
+
+            viewport->update(region);
+        }
+    }
+
+    dirtyRegions.clear();
+    dirtyRects.clear();
+    dirtyRectCount = 0;
+    dirtyBoundingRect = QRect();
+    updatingLater = false;
+}
+
+void QGraphicsViewPrivate::updateAll()
+{
+    Q_Q(QGraphicsView);
+    q->viewport()->update();
+    fullUpdatePending = true;
+    dirtyRectCount = 0;
+    dirtyBoundingRect = QRect();
+    updatingLater = false;
+}
+
+void QGraphicsViewPrivate::updateRegion(const QRegion &r)
+{
+    Q_Q(QGraphicsView);
+
+    // Rect intersects viewport - update everything?
+    switch (viewportUpdateMode) {
+    case QGraphicsView::FullViewportUpdate:
+        fullUpdatePending = true;
+        q->viewport()->update();
+        break;
+    case QGraphicsView::BoundingRectViewportUpdate:
+        dirtyBoundingRect |= r.boundingRect();
+        if (dirtyBoundingRect == q->viewport()->rect()) {
+            fullUpdatePending = true;
+            q->viewport()->update();
+        } else {
+            updateLater();
+        }
+        break;
+    case QGraphicsView::SmartViewportUpdate:
+        dirtyBoundingRect |= r.boundingRect();
+        if ((dirtyRectCount + r.numRects()) < QGRAPHICSVIEW_REGION_RECT_THRESHOLD)
+            dirtyRegions << r;
+        dirtyRectCount += r.numRects();
+        updateLater();
+        break;
+    case QGraphicsView::MinimalViewportUpdate:
+        dirtyRegions << r;
+        dirtyRectCount += r.numRects();
+        updateLater();
+        break;
+    case QGraphicsView::NoViewportUpdate:
+        // Unreachable
+        break;
+    }
+
+    // Compress the regions...
+    if (dirtyRectCount > QGRAPHICSVIEW_REGION_RECT_THRESHOLD && dirtyRegions.size() > 1) {
+        QRegion masterRegion;
+        for (int i=0; i<dirtyRegions.size(); ++i) {
+            masterRegion |= dirtyRegions.at(i);
+        }
+        dirtyRectCount = masterRegion.numRects();
+        dirtyRegions.clear();
+        dirtyRegions << masterRegion;
+    }
+}
+
+void QGraphicsViewPrivate::updateRect(const QRect &r)
+{
+    Q_Q(QGraphicsView);
+
+    // Rect intersects viewport - update everything?
+    switch (viewportUpdateMode) {
+    case QGraphicsView::FullViewportUpdate:
+        fullUpdatePending = true;
+        q->viewport()->update();
+        break;
+    case QGraphicsView::BoundingRectViewportUpdate:
+        dirtyBoundingRect |= r;
+        if (dirtyBoundingRect == q->viewport()->rect()) {
+            fullUpdatePending = true;
+            q->viewport()->update();
+        } else {
+            updateLater();
+        }
+        break;
+    case QGraphicsView::SmartViewportUpdate:
+        dirtyBoundingRect |= r;
+        if ((dirtyRectCount + dirtyRects.size()) < QGRAPHICSVIEW_REGION_RECT_THRESHOLD)
+            dirtyRects << r;
+        updateLater();
+        break;
+    case QGraphicsView::MinimalViewportUpdate:
+        dirtyRects << r;
+        updateLater();
+        break;
+    case QGraphicsView::NoViewportUpdate:
+        // Unreachable
+        break;
+    }
+}
+
+QStyleOptionGraphicsItem *QGraphicsViewPrivate::allocStyleOptionsArray(int numItems)
+{
+    if (mustAllocateStyleOptions || (numItems > styleOptions.capacity()))
+        // too many items, let's allocate on-the-fly
+        return new QStyleOptionGraphicsItem[numItems];
+
+    // expand only whenever necessary
+    if (numItems > styleOptions.size())
+        styleOptions.resize(numItems);
+
+    mustAllocateStyleOptions = true;
+    return styleOptions.data();
+}
+
+void QGraphicsViewPrivate::freeStyleOptionsArray(QStyleOptionGraphicsItem *array)
+{
+    mustAllocateStyleOptions = false;
+    if (array != styleOptions.data())
+        delete [] array;
+}
+
+
+QList<QGraphicsItem *> QGraphicsViewPrivate::findItems(const QRegion &exposedRegion,
+                                                       const QTransform &worldTransform,
+                                                       bool *allItems) const
+{
+    Q_Q(const QGraphicsView);
+    QList<QGraphicsItem *> itemList;
+    QSet<QGraphicsItem *> tmp;
+    bool simpleTransform = worldTransform.type() <= QTransform::TxScale;
+
+    extern QPainterPath qt_regionToPath(const QRegion &region);
+    QPainterPath path = qt_regionToPath(exposedRegion);
+    *allItems = path.contains(q->mapFromScene(scene->d_func()->growingItemsBoundingRect).boundingRect());
+    QList<QRectF> exposedRects;
+    QList<QPolygonF> exposedPolys;
+
+    // Transform the exposed viewport rects to scene rects or polygons
+    foreach (const QRect &rect, exposedRegion.rects()) {
+        QPolygonF exposedPoly = q->mapToScene(rect.adjusted(-1, -1, 1, 1));
+        QRectF exposedRect = exposedPoly.boundingRect();
+        if (!simpleTransform)
+            exposedPolys << exposedPoly;
+        exposedRects << exposedRect;
+    }
+
+    // Find which items need to be drawn.
+    if (*allItems) {
+        // All items are guaranteed within the exposed region, don't bother using the index.
+        foreach (QGraphicsItem *item, scene->items()) {
+            // But we only want to include items that are visible
+            if (item->isVisible())
+                itemList << item;
+        }
+    } else if (simpleTransform) {
+        // Simple rect lookups will do.
+        if (exposedRects.size() > 1) {
+            foreach (const QRectF &rect, exposedRects) {
+                foreach (QGraphicsItem *item, scene->d_func()->items_helper(rect, Qt::IntersectsItemBoundingRect, Qt::SortOrder(-1) /* don't sort */)) {
+                    if (!tmp.contains(item)) {
+                        tmp << item;
+                        itemList << item;
+                    }
+                }
+            }
+        } else {
+            itemList += scene->d_func()->items_helper(exposedRects[0], Qt::IntersectsItemBoundingRect, Qt::SortOrder(-1) /* don't sort */);
+        }
+    } else {
+        // Polygon lookup is necessary.
+        if (exposedRects.size() > 1) {
+            foreach (const QPolygonF &poly, exposedPolys) {
+                foreach (QGraphicsItem *item, scene->d_func()->items_helper(poly, Qt::IntersectsItemBoundingRect, Qt::SortOrder(-1) /* don't sort */)) {
+                    if (!tmp.contains(item)) {
+                        tmp << item;
+                        itemList << item;
+                    }
+                }
+            }
+        } else {
+            itemList += scene->d_func()->items_helper(exposedPolys[0], Qt::IntersectsItemBoundingRect, Qt::SortOrder(-1) /* don't sort */);
+        }
+    }
+
+    // Check for items that ignore inherited transformations, and add them if
+    // necessary.
+    QRectF untr = scene->d_func()->largestUntransformableItem;
+    if (!*allItems && !untr.isNull()) {
+        // Map the largest untransformable item subtree boundingrect from view
+        // to scene coordinates, and use this to expand all exposed rects in
+        // search for untransformable items.
+        QRectF ltri = matrix.inverted().mapRect(untr);
+        ltri.adjust(-untr.width(), -untr.height(), untr.width(), untr.height());
+
+        foreach (const QRect &rect, exposedRegion.rects()) {
+            QRectF exposed = q->mapToScene(rect.adjusted(-1, -1, 1, 1)).boundingRect();
+            exposed.adjust(-ltri.width(), -ltri.height(), ltri.width(), ltri.height());
+
+            foreach (QGraphicsItem *item, scene->d_func()->estimateItemsInRect(exposed)) {
+                if (item->d_ptr->itemIsUntransformable()) {
+                    if (!tmp.contains(item)) {
+                        QPainterPath rectPath;
+                        rectPath.addRect(rect);
+                        QPainterPath path = item->deviceTransform(q->viewportTransform()).inverted().map(rectPath);
+                        if (item->collidesWithPath(path, Qt::IntersectsItemBoundingRect)) {
+                            itemList << item;
+                            tmp << item;
+                        }
+                    }
+                }
+            }
+        }
+    }
+    tmp.clear();
+
+    // Sort the items.
+    QGraphicsScenePrivate::sortItems(&itemList, Qt::DescendingOrder,
+                                     scene->d_func()->sortCacheEnabled);
+
+    return itemList;
+}
+
+void QGraphicsViewPrivate::generateStyleOptions(const QList<QGraphicsItem *> &itemList,
+                                                QGraphicsItem **itemArray,
+                                                QStyleOptionGraphicsItem *styleOptionArray,
+                                                const QTransform &worldTransform,
+                                                bool allItems,
+                                                const QRegion &exposedRegion) const
+{
+    // Two unit vectors.
+    QLineF v1(0, 0, 1, 0);
+    QLineF v2(0, 0, 0, 1);
+    QTransform itemToViewportTransform;
+    QRectF brect;
+    QTransform reverseMap;
+
+    for (int i = 0; i < itemList.size(); ++i) {
+        QGraphicsItem *item = itemArray[i] = itemList[i];
+
+        QStyleOptionGraphicsItem &option = styleOptionArray[i];
+        brect = item->boundingRect();
+        option.state = QStyle::State_None;
+        option.rect = brect.toRect();
+        option.exposedRect = QRectF();
+        if (item->d_ptr->selected)
+            option.state |= QStyle::State_Selected;
+        if (item->d_ptr->enabled)
+            option.state |= QStyle::State_Enabled;
+        if (item->hasFocus())
+            option.state |= QStyle::State_HasFocus;
+        if (scene->d_func()->hoverItems.contains(item))
+            option.state |= QStyle::State_MouseOver;
+        if (item == scene->mouseGrabberItem())
+            option.state |= QStyle::State_Sunken;
+
+        // Calculate a simple level-of-detail metric.
+        // ### almost identical code in QGraphicsScene::render()
+        //     and QGraphicsView::render() - consider refactoring
+        if (item->d_ptr->itemIsUntransformable()) {
+            itemToViewportTransform = item->deviceTransform(worldTransform);
+        } else {
+            itemToViewportTransform = item->sceneTransform() * worldTransform;
+        }
+
+        if (itemToViewportTransform.type() <= QTransform::TxTranslate) {
+            // Translation and rotation only? The LOD is 1.
+            option.levelOfDetail = 1;
+        } else {
+            // LOD is the transformed area of a 1x1 rectangle.
+            option.levelOfDetail = qSqrt(itemToViewportTransform.map(v1).length() * itemToViewportTransform.map(v2).length());
+        }
+        option.matrix = itemToViewportTransform.toAffine(); //### discards perspective
+
+        if (!allItems) {
+            // Determine the item's exposed area
+            reverseMap = itemToViewportTransform.inverted();
+            foreach (const QRect &rect, exposedRegion.rects()) {
+                option.exposedRect |= reverseMap.mapRect(QRectF(rect.adjusted(-1, -1, 1, 1)));
+                if (option.exposedRect.contains(brect))
+                    break;
+            }
+            option.exposedRect &= brect;
+        } else {
+            // The whole item is exposed
+            option.exposedRect = brect;
+        }
+    }
+}
+
+/*!
+    Constructs a QGraphicsView. \a parent is passed to QWidget's constructor.
+*/
+QGraphicsView::QGraphicsView(QWidget *parent)
+    : QAbstractScrollArea(*new QGraphicsViewPrivate, parent)
+{
+    setViewport(0);
+    setAcceptDrops(true);
+    setBackgroundRole(QPalette::Base);
+
+    // ### Ideally this would be enabled/disabled depending on whether any
+    // widgets in the current scene enabled input methods. We could do that
+    // using a simple reference count. The same goes for acceptDrops and mouse
+    // tracking.
+    setAttribute(Qt::WA_InputMethodEnabled);
+}
+
+/*!
+    Constructs a QGraphicsView and sets the visualized scene to \a
+    scene. \a parent is passed to QWidget's constructor.
+*/
+QGraphicsView::QGraphicsView(QGraphicsScene *scene, QWidget *parent)
+    : QAbstractScrollArea(*new QGraphicsViewPrivate, parent)
+{
+    setScene(scene);
+    setViewport(0);
+    setAcceptDrops(true);
+    setBackgroundRole(QPalette::Base);
+    setAttribute(Qt::WA_InputMethodEnabled);
+}
+
+/*!
+  \internal
+ */
+QGraphicsView::QGraphicsView(QGraphicsViewPrivate &dd, QWidget *parent)
+  : QAbstractScrollArea(dd, parent)
+{
+    setViewport(0);
+    setAcceptDrops(true);
+    setBackgroundRole(QPalette::Base);
+    setAttribute(Qt::WA_InputMethodEnabled);
+}
+
+/*!
+    Destructs the QGraphicsView object.
+*/
+QGraphicsView::~QGraphicsView()
+{
+    Q_D(QGraphicsView);
+    if (d->scene)
+        d->scene->d_func()->views.removeAll(this);
+    delete d->lastDragDropEvent;
+}
+
+/*!
+    \reimp
+*/
+QSize QGraphicsView::sizeHint() const
+{
+    Q_D(const QGraphicsView);
+    if (d->scene) {
+        QSizeF baseSize = d->matrix.mapRect(sceneRect()).size();
+        baseSize += QSizeF(d->frameWidth * 2, d->frameWidth * 2);
+        return baseSize.boundedTo((3 * QApplication::desktop()->size()) / 4).toSize();
+    }
+    return QAbstractScrollArea::sizeHint();
+}
+
+/*!
+    \property QGraphicsView::renderHints
+    \brief the default render hints for the view
+
+    These hints are
+    used to initialize QPainter before each visible item is drawn. QPainter
+    uses render hints to toggle rendering features such as antialiasing and
+    smooth pixmap transformation.
+
+    QPainter::TextAntialiasing is enabled by default.
+
+    Example:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsview.cpp 1
+*/
+QPainter::RenderHints QGraphicsView::renderHints() const
+{
+    Q_D(const QGraphicsView);
+    return d->renderHints;
+}
+void QGraphicsView::setRenderHints(QPainter::RenderHints hints)
+{
+    Q_D(QGraphicsView);
+    if (hints == d->renderHints)
+        return;
+    d->renderHints = hints;
+    viewport()->update();
+}
+
+/*!
+    If \a enabled is true, the render hint \a hint is enabled; otherwise it
+    is disabled.
+
+    \sa renderHints
+*/
+void QGraphicsView::setRenderHint(QPainter::RenderHint hint, bool enabled)
+{
+    Q_D(QGraphicsView);
+    QPainter::RenderHints oldHints = d->renderHints;
+    if (enabled)
+        d->renderHints |= hint;
+    else
+        d->renderHints &= ~hint;
+    if (oldHints != d->renderHints)
+        viewport()->update();
+}
+
+/*!
+    \property QGraphicsView::alignment
+    \brief the alignment of the scene in the view when the whole
+    scene is visible.
+
+    If the whole scene is visible in the view, (i.e., there are no visible
+    scroll bars,) the view's alignment will decide where the scene will be
+    rendered in the view. For example, if the alignment is Qt::AlignCenter,
+    which is default, the scene will be centered in the view, and if the
+    alignment is (Qt::AlignLeft | Qt::AlignTop), the scene will be rendered in
+    the top-left corner of the view.
+*/
+Qt::Alignment QGraphicsView::alignment() const
+{
+    Q_D(const QGraphicsView);
+    return d->alignment;
+}
+void QGraphicsView::setAlignment(Qt::Alignment alignment)
+{
+    Q_D(QGraphicsView);
+    if (d->alignment != alignment) {
+        d->alignment = alignment;
+        d->recalculateContentSize();
+    }
+}
+
+/*!
+    \property QGraphicsView::transformationAnchor
+    \brief how the view should position the scene during transformations.
+
+    QGraphicsView uses this property to decide how to position the scene in
+    the viewport when the transformation matrix changes, and the coordinate
+    system of the view is transformed. The default behavior, AnchorViewCenter,
+    ensures that the scene point at the center of the view remains unchanged
+    during transformations (e.g., when rotating, the scene will appear to
+    rotate around the center of the view).
+
+    Note that the effect of this property is noticeable when only a part of the
+    scene is visible (i.e., when there are scroll bars). Otherwise, if the
+    whole scene fits in the view, QGraphicsScene uses the view \l alignment to
+    position the scene in the view.
+
+    \sa alignment, resizeAnchor
+*/
+QGraphicsView::ViewportAnchor QGraphicsView::transformationAnchor() const
+{
+    Q_D(const QGraphicsView);
+    return d->transformationAnchor;
+}
+void QGraphicsView::setTransformationAnchor(ViewportAnchor anchor)
+{
+    Q_D(QGraphicsView);
+    d->transformationAnchor = anchor;
+}
+
+/*!
+    \property QGraphicsView::resizeAnchor
+    \brief how the view should position the scene when the view is resized.
+
+    QGraphicsView uses this property to decide how to position the scene in
+    the viewport when the viewport widget's size changes. The default
+    behavior, NoAnchor, leaves the scene's position unchanged during a resize;
+    the top-left corner of the view will appear to be anchored while resizing.
+
+    Note that the effect of this property is noticeable when only a part of the
+    scene is visible (i.e., when there are scroll bars). Otherwise, if the
+    whole scene fits in the view, QGraphicsScene uses the view \l alignment to
+    position the scene in the view.
+
+    \sa alignment, transformationAnchor, Qt::WNorthWestGravity
+*/
+QGraphicsView::ViewportAnchor QGraphicsView::resizeAnchor() const
+{
+    Q_D(const QGraphicsView);
+    return d->resizeAnchor;
+}
+void QGraphicsView::setResizeAnchor(ViewportAnchor anchor)
+{
+    Q_D(QGraphicsView);
+    d->resizeAnchor = anchor;
+}
+
+/*!
+    \property QGraphicsView::viewportUpdateMode
+    \brief how the viewport should update its contents.
+
+    \since 4.3
+
+    QGraphicsView uses this property to decide how to update areas of the
+    scene that have been reexposed or changed. Usually you do not need to
+    modify this property, but there are some cases where doing so can improve
+    rendering performance. See the ViewportUpdateMode documentation for
+    specific details.
+
+    The default value is MinimalViewportUpdate, where QGraphicsView will
+    update as small an area of the viewport as possible when the contents
+    change.
+
+    \sa ViewportUpdateMode, cacheMode
+*/
+QGraphicsView::ViewportUpdateMode QGraphicsView::viewportUpdateMode() const
+{
+    Q_D(const QGraphicsView);
+    return d->viewportUpdateMode;
+}
+void QGraphicsView::setViewportUpdateMode(ViewportUpdateMode mode)
+{
+    Q_D(QGraphicsView);
+    d->viewportUpdateMode = mode;
+}
+
+/*!
+    \property QGraphicsView::optimizationFlags
+    \brief flags that can be used to tune QGraphicsView's performance.
+
+    \since 4.3
+
+    QGraphicsView uses clipping, extra bounding rect adjustments, and certain
+    other aids to improve rendering quality and performance for the common
+    case graphics scene. However, depending on the target platform, the scene,
+    and the viewport in use, some of these operations can degrade performance.
+
+    The effect varies from flag to flag; see the OptimizationFlags
+    documentation for details.
+
+    By default, no optimization flags are enabled.
+
+    \sa setOptimizationFlag()
+*/
+QGraphicsView::OptimizationFlags QGraphicsView::optimizationFlags() const
+{
+    Q_D(const QGraphicsView);
+    return d->optimizationFlags;
+}
+void QGraphicsView::setOptimizationFlags(OptimizationFlags flags)
+{
+    Q_D(QGraphicsView);
+    d->optimizationFlags = flags;
+}
+
+/*!
+    Enables \a flag if \a enabled is true; otherwise disables \a flag.
+
+    \sa optimizationFlags
+*/
+void QGraphicsView::setOptimizationFlag(OptimizationFlag flag, bool enabled)
+{
+    Q_D(QGraphicsView);
+    if (enabled)
+        d->optimizationFlags |= flag;
+    else
+        d->optimizationFlags &= ~flag;
+}
+
+/*!
+    \property QGraphicsView::dragMode
+    \brief the behavior for dragging the mouse over the scene while
+    the left mouse button is pressed.
+
+    This property defines what should happen when the user clicks on the scene
+    background and drags the mouse (e.g., scrolling the viewport contents
+    using a pointing hand cursor, or selecting multiple items with a rubber
+    band). The default value, NoDrag, does nothing.
+
+    This behavior only affects mouse clicks that are not handled by any item.
+    You can define a custom behavior by creating a subclass of QGraphicsView
+    and reimplementing mouseMoveEvent().
+*/
+QGraphicsView::DragMode QGraphicsView::dragMode() const
+{
+    Q_D(const QGraphicsView);
+    return d->dragMode;
+}
+void QGraphicsView::setDragMode(DragMode mode)
+{
+    Q_D(QGraphicsView);
+    if (d->dragMode == mode)
+        return;
+
+#ifndef QT_NO_CURSOR
+    if (d->dragMode == ScrollHandDrag)
+        viewport()->unsetCursor();
+#endif
+
+    // If dragMode is unset while dragging, e.g. via a keyEvent, we
+    // don't unset the handScrolling state. When enabling scrolling
+    // again the mouseMoveEvent will automatically start scrolling,
+    // without a mousePress
+    if (d->dragMode == ScrollHandDrag && mode == NoDrag && d->handScrolling)
+        d->handScrolling = false;
+
+    d->dragMode = mode;
+
+#ifndef QT_NO_CURSOR
+    if (d->dragMode == ScrollHandDrag) {
+        // Forget the stored viewport cursor when we enter scroll hand drag mode.
+        d->hasStoredOriginalCursor = false;
+        viewport()->setCursor(Qt::OpenHandCursor);
+    }
+#endif
+}
+
+#ifndef QT_NO_RUBBERBAND
+/*!
+    \property QGraphicsView::rubberBandSelectionMode
+    \brief the behavior for selecting items with a rubber band selection rectangle.
+    \since 4.3
+
+    This property defines how items are selected when using the RubberBandDrag
+    drag mode.
+
+    The default value is Qt::IntersectsItemShape; all items whose shape
+    intersects with or is contained by the rubber band are selected.
+
+    \sa dragMode, items()
+*/
+Qt::ItemSelectionMode QGraphicsView::rubberBandSelectionMode() const
+{
+    Q_D(const QGraphicsView);
+    return d->rubberBandSelectionMode;
+}
+void QGraphicsView::setRubberBandSelectionMode(Qt::ItemSelectionMode mode)
+{
+    Q_D(QGraphicsView);
+    d->rubberBandSelectionMode = mode;
+}
+#endif
+
+/*!
+    \property QGraphicsView::cacheMode
+    \brief which parts of the view are cached
+
+    QGraphicsView can cache pre-rendered content in a QPixmap, which is then
+    drawn onto the viewport. The purpose of such caching is to speed up the
+    total rendering time for areas that are slow to render.  Texture, gradient
+    and alpha blended backgrounds, for example, can be notibly slow to render;
+    especially with a transformed view. The CacheBackground flag enables
+    caching of the view's background. For example:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsview.cpp 2
+
+    The cache is invalidated every time the view is transformed. However, when
+    scrolling, only partial invalidation is required.
+
+    By default, nothing is cached.
+
+    \sa resetCachedContent(), QPixmapCache
+*/
+QGraphicsView::CacheMode QGraphicsView::cacheMode() const
+{
+    Q_D(const QGraphicsView);
+    return d->cacheMode;
+}
+void QGraphicsView::setCacheMode(CacheMode mode)
+{
+    Q_D(QGraphicsView);
+    if (mode == d->cacheMode)
+        return;
+    d->cacheMode = mode;
+    resetCachedContent();
+}
+
+/*!
+    Resets any cached content. Calling this function will clear
+    QGraphicsView's cache. If the current cache mode is \l CacheNone, this
+    function does nothing.
+
+    This function is called automatically for you when the backgroundBrush or
+    QGraphicsScene::backgroundBrush properties change; you only need to call
+    this function if you have reimplemented QGraphicsScene::drawBackground()
+    or QGraphicsView::drawBackground() to draw a custom background, and need
+    to trigger a full redraw.
+
+    \sa cacheMode()
+*/
+void QGraphicsView::resetCachedContent()
+{
+    Q_D(QGraphicsView);
+    if (d->cacheMode == CacheNone)
+        return;
+
+    if (d->cacheMode & CacheBackground) {
+        // Background caching is enabled.
+        d->mustResizeBackgroundPixmap = true;
+        viewport()->update();
+    } else if (d->mustResizeBackgroundPixmap) {
+        // Background caching is disabled.
+        // Cleanup, free some resources.
+        d->mustResizeBackgroundPixmap = false;
+        d->backgroundPixmap = QPixmap();
+        d->backgroundPixmapExposed = QRegion();
+    }
+}
+
+/*!
+    Invalidates and schedules a redraw of \a layers inside \a rect. \a rect is
+    in scene coordinates. Any cached content for \a layers inside \a rect is
+    unconditionally invalidated and redrawn.
+
+    You can call this function to notify QGraphicsView of changes to the
+    background or the foreground of the scene. It is commonly used for scenes
+    with tile-based backgrounds to notify changes when QGraphicsView has
+    enabled background caching.
+
+    Note that QGraphicsView currently supports background caching only (see
+    QGraphicsView::CacheBackground). This function is equivalent to calling update() if any
+    layer but QGraphicsScene::BackgroundLayer is passed.
+
+    \sa QGraphicsScene::invalidate(), update()
+*/
+void QGraphicsView::invalidateScene(const QRectF &rect, QGraphicsScene::SceneLayers layers)
+{
+    Q_D(QGraphicsView);
+    if ((layers & QGraphicsScene::BackgroundLayer) && !d->mustResizeBackgroundPixmap) {
+        QRect viewRect = mapFromScene(rect).boundingRect();
+        if (viewport()->rect().intersects(viewRect)) {
+            // The updated background area is exposed; schedule this area for
+            // redrawing.
+            d->backgroundPixmapExposed += viewRect;
+            if (d->scene)
+                d->scene->update(rect);
+        }
+    }
+}
+
+/*!
+    \property QGraphicsView::interactive
+    \brief whether the view allowed scene interaction.
+
+    If enabled, this view is set to allow scene interaction. Otherwise, this
+    view will not allow interaction, and any mouse or key events are ignored
+    (i.e., it will act as a read-only view).
+
+    By default, this property is true.
+*/
+bool QGraphicsView::isInteractive() const
+{
+    Q_D(const QGraphicsView);
+    return d->sceneInteractionAllowed;
+}
+void QGraphicsView::setInteractive(bool allowed)
+{
+    Q_D(QGraphicsView);
+    d->sceneInteractionAllowed = allowed;
+}
+
+/*!
+    Returns a pointer to the scene that is currently visualized in the
+    view. If no scene is currently visualized, 0 is returned.
+
+    \sa setScene()
+*/
+QGraphicsScene *QGraphicsView::scene() const
+{
+    Q_D(const QGraphicsView);
+    return d->scene;
+}
+
+/*!
+    Sets the current scene to \a scene. If \a scene is already being
+    viewed, this function does nothing.
+
+    When a scene is set on a view, the QGraphicsScene::changed() signal
+    is automatically connected to this view's updateScene() slot, and the
+    view's scroll bars are adjusted to fit the size of the scene.
+*/
+void QGraphicsView::setScene(QGraphicsScene *scene)
+{
+    Q_D(QGraphicsView);
+    if (d->scene == scene)
+        return;
+
+    // Always update the viewport when the scene changes.
+    viewport()->update();
+
+    // Remove the previously assigned scene.
+    if (d->scene) {
+        disconnect(d->scene, SIGNAL(changed(QList<QRectF>)),
+                   this, SLOT(updateScene(QList<QRectF>)));
+        disconnect(d->scene, SIGNAL(sceneRectChanged(QRectF)),
+                   this, SLOT(updateSceneRect(QRectF)));
+        d->scene->d_func()->views.removeAll(this);
+    }
+
+    // Assign the new scene and update the contents (scrollbars, etc.)).
+    if ((d->scene = scene)) {
+        connect(d->scene, SIGNAL(sceneRectChanged(QRectF)),
+                this, SLOT(updateSceneRect(QRectF)));
+        d->updateSceneSlotReimplementedChecked = false;
+        d->scene->d_func()->views << this;
+        d->recalculateContentSize();
+        d->lastCenterPoint = sceneRect().center();
+        d->keepLastCenterPoint = true;
+    } else {
+        d->recalculateContentSize();
+    }
+}
+
+/*!
+    \property QGraphicsView::sceneRect
+    \brief the area of the scene visualized by this view.
+
+    The scene rectangle defines the extent of the scene, and in the view's case,
+    this means the area of the scene that you can navigate using the scroll
+    bars.
+
+    If unset, or if a null QRectF is set, this property has the same value as
+    QGraphicsScene::sceneRect, and it changes with
+    QGraphicsScene::sceneRect. Otherwise, the view's scene rect is unaffected
+    by the scene.
+
+    Note that, although the scene supports a virtually unlimited size, the
+    range of the scroll bars will never exceed the range of an integer
+    (INT_MIN, INT_MAX). When the scene is larger than the scroll bars' values,
+    you can choose to use translate() to navigate the scene instead.
+
+    By default, this property contains a rectangle at the origin with zero
+    width and height.
+
+    \sa QGraphicsScene::sceneRect
+*/
+QRectF QGraphicsView::sceneRect() const
+{
+    Q_D(const QGraphicsView);
+    if (d->hasSceneRect)
+        return d->sceneRect;
+    if (d->scene)
+        return d->scene->sceneRect();
+    return QRectF();
+}
+void QGraphicsView::setSceneRect(const QRectF &rect)
+{
+    Q_D(QGraphicsView);
+    d->hasSceneRect = !rect.isNull();
+    d->sceneRect = rect;
+    d->recalculateContentSize();
+}
+
+/*!
+    Returns the current transformation matrix for the view. If no current
+    transformation is set, the identity matrix is returned.
+
+    \sa setMatrix(), rotate(), scale(), shear(), translate()
+*/
+QMatrix QGraphicsView::matrix() const
+{
+    Q_D(const QGraphicsView);
+    return d->matrix.toAffine();
+}
+
+/*!
+    Sets the view's current transformation matrix to \a matrix.
+
+    If \a combine is true, then \a matrix is combined with the current matrix;
+    otherwise, \a matrix \e replaces the current matrix. \a combine is false
+    by default.
+
+    The transformation matrix tranforms the scene into view coordinates. Using
+    the default transformation, provided by the identity matrix, one pixel in
+    the view represents one unit in the scene (e.g., a 10x10 rectangular item
+    is drawn using 10x10 pixels in the view). If a 2x2 scaling matrix is
+    applied, the scene will be drawn in 1:2 (e.g., a 10x10 rectangular item is
+    then drawn using 20x20 pixels in the view).
+
+    Example:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsview.cpp 3
+
+    To simplify interation with items using a transformed view, QGraphicsView
+    provides mapTo... and mapFrom... functions that can translate between
+    scene and view coordinates. For example, you can call mapToScene() to map
+    a view coordinate to a floating point scene coordinate, or mapFromScene()
+    to map from floating point scene coordinates to view coordinates.
+
+    \sa matrix(), rotate(), scale(), shear(), translate()
+*/
+void QGraphicsView::setMatrix(const QMatrix &matrix, bool combine)
+{
+    setTransform(QTransform(matrix), combine);
+}
+
+/*!
+    Resets the view transformation matrix to the identity matrix.
+*/
+void QGraphicsView::resetMatrix()
+{
+    resetTransform();
+}
+
+/*!
+    Rotates the current view transformation \a angle degrees clockwise.
+
+    \sa setMatrix(), matrix(), scale(), shear(), translate()
+*/
+void QGraphicsView::rotate(qreal angle)
+{
+    Q_D(QGraphicsView);
+    QTransform matrix = d->matrix;
+    matrix.rotate(angle);
+    setTransform(matrix);
+}
+
+/*!
+    Scales the current view transformation by (\a sx, \a sy).
+
+    \sa setMatrix(), matrix(), rotate(), shear(), translate()
+*/
+void QGraphicsView::scale(qreal sx, qreal sy)
+{
+    Q_D(QGraphicsView);
+    QTransform matrix = d->matrix;
+    matrix.scale(sx, sy);
+    setTransform(matrix);
+}
+
+/*!
+    Shears the current view transformation by (\a sh, \a sv).
+
+    \sa setMatrix(), matrix(), rotate(), scale(), translate()
+*/
+void QGraphicsView::shear(qreal sh, qreal sv)
+{
+    Q_D(QGraphicsView);
+    QTransform matrix = d->matrix;
+    matrix.shear(sh, sv);
+    setTransform(matrix);
+}
+
+/*!
+    Translates the current view transformation by (\a dx, \a dy).
+
+    \sa setMatrix(), matrix(), rotate(), shear()
+*/
+void QGraphicsView::translate(qreal dx, qreal dy)
+{
+    Q_D(QGraphicsView);
+    QTransform matrix = d->matrix;
+    matrix.translate(dx, dy);
+    setTransform(matrix);
+}
+
+/*!
+    Scrolls the contents of the viewport to ensure that the scene
+    coordinate \a pos, is centered in the view.
+
+    Because \a pos is a floating point coordinate, and the scroll bars operate
+    on integer coordinates, the centering is only an approximation.
+
+    \note If the item is close to or outside the border, it will be visible
+    in the view, but not centered.
+
+    \sa ensureVisible()
+*/
+void QGraphicsView::centerOn(const QPointF &pos)
+{
+    Q_D(QGraphicsView);
+    qreal width = viewport()->width();
+    qreal height = viewport()->height();
+    QPointF viewPoint = d->matrix.map(pos);
+    QPointF oldCenterPoint = pos;
+
+    if (!d->leftIndent) {
+        if (isRightToLeft()) {
+            qint64 horizontal = 0;
+            horizontal += horizontalScrollBar()->minimum();
+            horizontal += horizontalScrollBar()->maximum();
+            horizontal -= int(viewPoint.x() - width / 2.0);
+            horizontalScrollBar()->setValue(horizontal);
+        } else {
+            horizontalScrollBar()->setValue(int(viewPoint.x() - width / 2.0));
+        }
+    }
+    if (!d->topIndent)
+        verticalScrollBar()->setValue(int(viewPoint.y() - height / 2.0));
+    d->lastCenterPoint = oldCenterPoint;
+}
+
+/*!
+    \fn QGraphicsView::centerOn(qreal x, qreal y)
+    \overload
+
+    This function is provided for convenience. It's equivalent to calling
+    centerOn(QPointF(\a x, \a y)).
+*/
+
+/*!
+    \overload
+
+    Scrolls the contents of the viewport to ensure that \a item
+    is centered in the view.
+
+    \sa ensureVisible()
+*/
+void QGraphicsView::centerOn(const QGraphicsItem *item)
+{
+    centerOn(item->sceneBoundingRect().center());
+}
+
+/*!
+    Scrolls the contents of the viewport so that the scene rectangle \a rect
+    is visible, with margins specified in pixels by \a xmargin and \a
+    ymargin. If the specified rect cannot be reached, the contents are
+    scrolled to the nearest valid position. The default value for both margins
+    is 50 pixels.
+
+    \sa centerOn()
+*/
+void QGraphicsView::ensureVisible(const QRectF &rect, int xmargin, int ymargin)
+{
+    Q_D(QGraphicsView);
+    Q_UNUSED(xmargin);
+    Q_UNUSED(ymargin);
+    qreal width = viewport()->width();
+    qreal height = viewport()->height();
+    QRectF viewRect = d->matrix.mapRect(rect);
+
+    qreal left = d->horizontalScroll();
+    qreal right = left + width;
+    qreal top = d->verticalScroll();
+    qreal bottom = top + height;
+
+    if (viewRect.left() <= left + xmargin) {
+        // need to scroll from the left
+        if (!d->leftIndent)
+            horizontalScrollBar()->setValue(int(viewRect.left() - xmargin - 0.5));
+    }
+    if (viewRect.right() >= right - xmargin) {
+        // need to scroll from the right
+        if (!d->leftIndent)
+            horizontalScrollBar()->setValue(int(viewRect.right() - width + xmargin + 0.5));
+    }
+    if (viewRect.top() <= top + ymargin) {
+        // need to scroll from the top
+        if (!d->topIndent)
+            verticalScrollBar()->setValue(int(viewRect.top() - ymargin - 0.5));
+    }
+    if (viewRect.bottom() >= bottom - ymargin) {
+        // need to scroll from the bottom
+        if (!d->topIndent)
+            verticalScrollBar()->setValue(int(viewRect.bottom() - height + ymargin + 0.5));
+    }
+}
+
+/*!
+    \fn QGraphicsView::ensureVisible(qreal x, qreal y, qreal w, qreal h,
+    int xmargin, int ymargin)
+    \overload
+
+    This function is provided for convenience. It's equivalent to calling
+    ensureVisible(QRectF(\a x, \a y, \a w, \a h), \a xmargin, \a ymargin).
+*/
+
+/*!
+    \overload
+
+    Scrolls the contents of the viewport so that the center of item \a item is
+    visible, with margins specified in pixels by \a xmargin and \a ymargin. If
+    the specified point cannot be reached, the contents are scrolled to the
+    nearest valid position. The default value for both margins is 50 pixels.
+
+    \sa centerOn()
+*/
+void QGraphicsView::ensureVisible(const QGraphicsItem *item, int xmargin, int ymargin)
+{
+    ensureVisible(item->sceneBoundingRect(), xmargin, ymargin);
+}
+
+/*!
+    Scales the view matrix and scrolls the scroll bars to ensure that the
+    scene rectangle \a rect fits inside the viewport. \a rect must be inside
+    the scene rect; otherwise, fitInView() cannot guarantee that the whole
+    rect is visible.
+
+    This function keeps the view's rotation, translation, or shear. The view
+    is scaled according to \a aspectRatioMode. \a rect will be centered in the
+    view if it does not fit tightly.
+
+    It's common to call fitInView() from inside a reimplementation of
+    resizeEvent(), to ensure that the whole scene, or parts of the scene,
+    scales automatically to fit the new size of the viewport as the view is
+    resized. Note though, that calling fitInView() from inside resizeEvent()
+    can lead to unwanted resize recursion, if the new transformation toggles
+    the automatic state of the scrollbars. You can toggle the scrollbar
+    policies to always on or always off to prevent this (see
+    horizontalScrollBarPolicy() and verticalScrollBarPolicy()).
+
+    If \a rect is empty, or if the viewport is too small, this
+    function will do nothing.
+
+    \sa setMatrix(), ensureVisible(), centerOn()
+*/
+void QGraphicsView::fitInView(const QRectF &rect, Qt::AspectRatioMode aspectRatioMode)
+{
+    Q_D(QGraphicsView);
+    if (!d->scene || rect.isNull())
+        return;
+
+    // Reset the view scale to 1:1.
+    QRectF unity = d->matrix.mapRect(QRectF(0, 0, 1, 1));
+    if (unity.isEmpty())
+        return;
+    scale(1 / unity.width(), 1 / unity.height());
+
+    // Find the ideal x / y scaling ratio to fit \a rect in the view.
+    int margin = 2;
+    QRectF viewRect = viewport()->rect().adjusted(margin, margin, -margin, -margin);
+    if (viewRect.isEmpty())
+        return;
+    QRectF sceneRect = d->matrix.mapRect(rect);
+    if (sceneRect.isEmpty())
+        return;
+    qreal xratio = viewRect.width() / sceneRect.width();
+    qreal yratio = viewRect.height() / sceneRect.height();
+
+    // Respect the aspect ratio mode.
+    switch (aspectRatioMode) {
+    case Qt::KeepAspectRatio:
+        xratio = yratio = qMin(xratio, yratio);
+        break;
+    case Qt::KeepAspectRatioByExpanding:
+        xratio = yratio = qMax(xratio, yratio);
+        break;
+    case Qt::IgnoreAspectRatio:
+        break;
+    }
+
+    // Scale and center on the center of \a rect.
+    scale(xratio, yratio);
+    centerOn(rect.center());
+}
+
+/*!
+    \fn void QGraphicsView::fitInView(qreal x, qreal y, qreal w, qreal h,
+    Qt::AspectRatioMode aspectRatioMode = Qt::IgnoreAspectRatio)
+
+    \overload
+
+    This convenience function is equivalent to calling
+    fitInView(QRectF(\a x, \a y, \a w, \a h), \a aspectRatioMode).
+
+    \sa ensureVisible(), centerOn()
+*/
+
+/*!
+    \overload
+
+    Ensures that \a item fits tightly inside the view, scaling the view
+    according to \a aspectRatioMode.
+
+    \sa ensureVisible(), centerOn()
+*/
+void QGraphicsView::fitInView(const QGraphicsItem *item, Qt::AspectRatioMode aspectRatioMode)
+{
+    QPainterPath path = item->isClipped() ? item->clipPath() : item->shape();
+    fitInView(item->sceneTransform().map(path).boundingRect(), aspectRatioMode);
+}
+
+/*!
+    Renders the \a source rect, which is in view coordinates, from the scene
+    into \a target, which is in paint device coordinates, using \a
+    painter. This function is useful for capturing the contents of the view
+    onto a paint device, such as a QImage (e.g., to take a screenshot), or for
+    printing to QPrinter. For example:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsview.cpp 4
+
+    If \a source is a null rect, this function will use viewport()->rect() to
+    determine what to draw. If \a target is a null rect, the full dimensions
+    of \a painter's paint device (e.g., for a QPrinter, the page size) will be
+    used.
+
+    The source rect contents will be transformed according to \a
+    aspectRatioMode to fit into the target rect. By default, the aspect ratio
+    is kept, and \a source is scaled to fit in \a target.
+
+    \sa QGraphicsScene::render()
+*/
+void QGraphicsView::render(QPainter *painter, const QRectF &target, const QRect &source,
+                           Qt::AspectRatioMode aspectRatioMode)
+{
+    Q_D(QGraphicsView);
+    if (!d->scene || !(painter && painter->isActive()))
+        return;
+
+    // Default source rect = viewport rect
+    QRect sourceRect = source;
+    if (source.isNull())
+        sourceRect = viewport()->rect();
+
+    // Default target rect = device rect
+    QRectF targetRect = target;
+    if (target.isNull()) {
+        if (painter->device()->devType() == QInternal::Picture)
+            targetRect = sourceRect;
+        else
+            targetRect.setRect(0, 0, painter->device()->width(), painter->device()->height());
+    }
+
+    // Find the ideal x / y scaling ratio to fit \a source into \a target.
+    qreal xratio = targetRect.width() / sourceRect.width();
+    qreal yratio = targetRect.height() / sourceRect.height();
+
+    // Scale according to the aspect ratio mode.
+    switch (aspectRatioMode) {
+    case Qt::KeepAspectRatio:
+        xratio = yratio = qMin(xratio, yratio);
+        break;
+    case Qt::KeepAspectRatioByExpanding:
+        xratio = yratio = qMax(xratio, yratio);
+        break;
+    case Qt::IgnoreAspectRatio:
+        break;
+    }
+
+    // Find all items to draw, and reverse the list (we want to draw
+    // in reverse order).
+    QPolygonF sourceScenePoly = mapToScene(sourceRect.adjusted(-1, -1, 1, 1));
+    QList<QGraphicsItem *> itemList = d->scene->items(sourceScenePoly,
+                                                      Qt::IntersectsItemBoundingRect);
+    QGraphicsItem **itemArray = new QGraphicsItem *[itemList.size()];
+    int numItems = itemList.size();
+    for (int i = 0; i < numItems; ++i)
+        itemArray[numItems - i - 1] = itemList.at(i);
+    itemList.clear();
+
+    // Setup painter matrix.
+    QTransform moveMatrix;
+    moveMatrix.translate(-d->horizontalScroll(), -d->verticalScroll());
+    QTransform painterMatrix = d->matrix * moveMatrix;
+    painterMatrix *= QTransform()
+                     .translate(targetRect.left(), targetRect.top())
+                     .scale(xratio, yratio)
+                     .translate(-sourceRect.left(), -sourceRect.top());
+
+    // Two unit vectors.
+    QLineF v1(0, 0, 1, 0);
+    QLineF v2(0, 0, 0, 1);
+
+    // Generate the style options
+    QStyleOptionGraphicsItem *styleOptionArray = d->allocStyleOptionsArray(numItems);
+    QStyleOptionGraphicsItem* option = styleOptionArray;
+    for (int i = 0; i < numItems; ++i, ++option) {
+        QGraphicsItem *item = itemArray[i];
+
+        option->state = QStyle::State_None;
+        option->rect = item->boundingRect().toRect();
+        if (item->isSelected())
+            option->state |= QStyle::State_Selected;
+        if (item->isEnabled())
+            option->state |= QStyle::State_Enabled;
+        if (item->hasFocus())
+            option->state |= QStyle::State_HasFocus;
+        if (d->scene->d_func()->hoverItems.contains(item))
+            option->state |= QStyle::State_MouseOver;
+        if (item == d->scene->mouseGrabberItem())
+            option->state |= QStyle::State_Sunken;
+
+        // Calculate a simple level-of-detail metric.
+        // ### almost identical code in QGraphicsScene::render()
+        //     and QGraphicsView::paintEvent() - consider refactoring
+        QTransform itemToViewportTransform;
+        if (item->d_ptr->itemIsUntransformable()) {
+            itemToViewportTransform = item->deviceTransform(painterMatrix);
+        } else {
+            itemToViewportTransform = item->sceneTransform() * painterMatrix;
+        }
+
+        option->levelOfDetail = qSqrt(itemToViewportTransform.map(v1).length() * itemToViewportTransform.map(v2).length());
+        option->matrix = itemToViewportTransform.toAffine();
+
+        option->exposedRect = item->boundingRect();
+        option->exposedRect &= itemToViewportTransform.inverted().mapRect(targetRect);
+    }
+
+    painter->save();
+
+    // Clip in device coordinates to avoid QRegion transformations.
+    painter->setClipRect(targetRect);
+    QPainterPath path;
+    path.addPolygon(sourceScenePoly);
+    path.closeSubpath();
+    painter->setClipPath(painterMatrix.map(path), Qt::IntersectClip);
+
+    // Transform the painter.
+    painter->setTransform(painterMatrix, true);
+
+    // Render the scene.
+    QRectF sourceSceneRect = sourceScenePoly.boundingRect();
+    drawBackground(painter, sourceSceneRect);
+    drawItems(painter, numItems, itemArray, styleOptionArray);
+    drawForeground(painter, sourceSceneRect);
+
+    delete [] itemArray;
+    d->freeStyleOptionsArray(styleOptionArray);
+
+    painter->restore();
+}
+
+/*!
+    Returns a list of all the items in the associated scene.
+
+    \sa QGraphicsScene::items()
+*/
+QList<QGraphicsItem *> QGraphicsView::items() const
+{
+    Q_D(const QGraphicsView);
+    if (!d->scene)
+        return QList<QGraphicsItem *>();
+    return d->scene->items();
+}
+
+/*!
+    Returns all items in the area \a path, which is in viewport coordinates,
+    also taking untransformable items into consideration. This function is
+    considerably slower than just checking the scene directly. There is
+    certainly room for improvement.
+*/
+QList<QGraphicsItem *> QGraphicsViewPrivate::itemsInArea(const QPainterPath &path,
+                                                         Qt::ItemSelectionMode mode) const
+{
+    Q_Q(const QGraphicsView);
+
+    // Determine the size of the largest untransformable subtree of children
+    // mapped to scene coordinates.
+    QRectF untr = scene->d_func()->largestUntransformableItem;
+    QRectF ltri = matrix.inverted().mapRect(untr);
+    ltri.adjust(-untr.width(), -untr.height(), untr.width(), untr.height());
+
+    QRectF rect = path.controlPointRect();
+
+    // Find all possible items in the relevant area.
+    // ### Improve this algorithm; it might be searching a too large area.
+    QRectF adjustedRect = q->mapToScene(rect.adjusted(-1, -1, 1, 1).toRect()).boundingRect();
+    adjustedRect.adjust(-ltri.width(), -ltri.height(), ltri.width(), ltri.height());
+
+    // First build a (potentially large) list of all items in the vicinity
+    // that might be untransformable.
+    QList<QGraphicsItem *> allCandidates = scene->d_func()->estimateItemsInRect(adjustedRect);
+
+    // Then find the minimal list of items that are inside \a path, and
+    // convert it to a set.
+    QList<QGraphicsItem *> regularCandidates = scene->items(q->mapToScene(path), mode);
+    QSet<QGraphicsItem *> candSet = QSet<QGraphicsItem *>::fromList(regularCandidates);
+
+    QTransform viewMatrix = q->viewportTransform();
+
+    QList<QGraphicsItem *> result;
+
+    // Run through all candidates and keep all items that are in candSet, or
+    // are untransformable and collide with \a path. ### We can improve this
+    // algorithm.
+    QList<QGraphicsItem *>::Iterator it = allCandidates.begin();
+    while (it != allCandidates.end()) {
+        QGraphicsItem *item = *it;
+        if (item->d_ptr->itemIsUntransformable()) {
+            // Check if this untransformable item collides with the
+            // original selection rect.
+            QTransform itemTransform = item->deviceTransform(viewMatrix);
+            if (QGraphicsScenePrivate::itemCollidesWithPath(item, itemTransform.inverted().map(path), mode))
+                result << item;
+        } else {
+            if (candSet.contains(item))
+                result << item;
+        }
+        ++it;
+    }
+
+    // ### Insertion sort would be faster.
+    QGraphicsScenePrivate::sortItems(&result, Qt::AscendingOrder,
+                                     scene->d_func()->sortCacheEnabled);
+    return result;
+}
+
+/*!
+    Returns a list of all the items at the position \a pos in the view. The
+    items are listed in descending Z order (i.e., the first item in the list
+    is the top-most item, and the last item is the bottom-most item). \a pos
+    is in viewport coordinates.
+
+    This function is most commonly called from within mouse event handlers in
+    a subclass in QGraphicsView. \a pos is in untransformed viewport
+    coordinates, just like QMouseEvent::pos().
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsview.cpp 5
+
+    \sa QGraphicsScene::items(), QGraphicsItem::zValue()
+*/
+QList<QGraphicsItem *> QGraphicsView::items(const QPoint &pos) const
+{
+    Q_D(const QGraphicsView);
+    if (!d->scene)
+        return QList<QGraphicsItem *>();
+    if (d->scene->d_func()->largestUntransformableItem.isNull()) {
+        if ((d->identityMatrix || d->matrix.type() <= QTransform::TxScale)) {
+            QTransform xinv = viewportTransform().inverted();
+            return d->scene->items(xinv.mapRect(QRectF(pos.x(), pos.y(), 1, 1)));
+        }
+        return d->scene->items(mapToScene(pos.x(), pos.y(), 2, 2));
+    }
+
+    QPainterPath path;
+    path.addRect(QRectF(pos.x(), pos.y(), 1, 1));
+    return d->itemsInArea(path);
+}
+
+/*!
+    \fn QGraphicsView::items(int x, int y) const
+
+    This function is provided for convenience. It's equivalent to calling
+    items(QPoint(\a x, \a y)).
+*/
+
+/*!
+    \overload
+
+    Returns a list of all the items that, depending on \a mode, are either
+    contained by or intersect with \a rect. \a rect is in viewport
+    coordinates.
+
+    The default value for \a mode is Qt::IntersectsItemShape; all items whose
+    exact shape intersects with or is contained by \a rect are returned.
+
+    \sa itemAt(), items(), mapToScene()
+*/
+QList<QGraphicsItem *> QGraphicsView::items(const QRect &rect, Qt::ItemSelectionMode mode) const
+{
+    Q_D(const QGraphicsView);
+    if (!d->scene)
+        return QList<QGraphicsItem *>();
+    if (d->scene->d_func()->largestUntransformableItem.isNull())
+        return d->scene->items(mapToScene(rect), mode);
+
+    QPainterPath path;
+    path.addRect(rect);
+    return d->itemsInArea(path);
+}
+
+/*!
+    \fn QList<QGraphicsItem *> QGraphicsView::items(int x, int y, int w, int h, Qt::ItemSelectionMode mode) const
+    \since 4.3
+
+    This convenience function is equivalent to calling items(QRectF(\a x, \a
+    y, \a w, \a h), \a mode).
+*/
+
+/*!
+    \overload
+
+    Returns a list of all the items that, depending on \a mode, are either
+    contained by or intersect with \a polygon. \a polygon is in viewport
+    coordinates.
+
+    The default value for \a mode is Qt::IntersectsItemShape; all items whose
+    exact shape intersects with or is contained by \a polygon are returned.
+
+    \sa itemAt(), items(), mapToScene()
+*/
+QList<QGraphicsItem *> QGraphicsView::items(const QPolygon &polygon, Qt::ItemSelectionMode mode) const
+{
+    Q_D(const QGraphicsView);
+    if (!d->scene)
+        return QList<QGraphicsItem *>();
+    if (d->scene->d_func()->largestUntransformableItem.isNull())
+        return d->scene->items(mapToScene(polygon), mode);
+
+    QPainterPath path;
+    path.addPolygon(polygon);
+    path.closeSubpath();
+    return d->itemsInArea(path);
+}
+
+/*!
+    \overload
+
+    Returns a list of all the items that, depending on \a mode, are either
+    contained by or intersect with \a path. \a path is in viewport
+    coordinates.
+
+    The default value for \a mode is Qt::IntersectsItemShape; all items whose
+    exact shape intersects with or is contained by \a path are returned.
+
+    \sa itemAt(), items(), mapToScene()
+*/
+QList<QGraphicsItem *> QGraphicsView::items(const QPainterPath &path, Qt::ItemSelectionMode mode) const
+{
+    Q_D(const QGraphicsView);
+    if (!d->scene)
+        return QList<QGraphicsItem *>();
+    if (d->scene->d_func()->largestUntransformableItem.isNull())
+        return d->scene->items(mapToScene(path), mode);
+    return d->itemsInArea(path);
+}
+
+/*!
+    Returns the item at position \a pos, which is in viewport coordinates.
+    If there are several items at this position, this function returns
+    the topmost item.
+
+    Example:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsview.cpp 6
+
+    \sa items()
+*/
+QGraphicsItem *QGraphicsView::itemAt(const QPoint &pos) const
+{
+    Q_D(const QGraphicsView);
+    if (!d->scene)
+        return 0;
+    QList<QGraphicsItem *> itemsAtPos = items(pos);
+    return itemsAtPos.isEmpty() ? 0 : itemsAtPos.first();
+}
+
+/*!
+    \overload
+    \fn QGraphicsItem *QGraphicsView::itemAt(int x, int y) const
+
+    This function is provided for convenience. It's equivalent to
+    calling itemAt(QPoint(\a x, \a y)).
+*/
+
+/*!
+    Returns the viewport coordinate \a point mapped to scene coordinates.
+
+    Note: It can be useful to map the whole rectangle covered by the pixel at
+    \a point instead of the point itself. To do this, you can call
+    mapToScene(QRect(\a point, QSize(2, 2))).
+
+    \sa mapFromScene()
+*/
+QPointF QGraphicsView::mapToScene(const QPoint &point) const
+{
+    Q_D(const QGraphicsView);
+    QPointF p = point;
+    p.rx() += d->horizontalScroll();
+    p.ry() += d->verticalScroll();
+    return d->identityMatrix ? p : d->matrix.inverted().map(p);
+}
+
+/*!
+    \fn QGraphicsView::mapToScene(int x, int y) const
+
+    This function is provided for convenience. It's equivalent to calling
+    mapToScene(QPoint(\a x, \a y)).
+*/
+
+/*!
+    Returns the viewport rectangle \a rect mapped to a scene coordinate
+    polygon.
+
+    \sa mapFromScene()
+*/
+QPolygonF QGraphicsView::mapToScene(const QRect &rect) const
+{
+    Q_D(const QGraphicsView);
+    if (!rect.isValid())
+        return QPolygonF();
+
+    QPointF scrollOffset(d->horizontalScroll(), d->verticalScroll());
+    QPointF tl = scrollOffset + rect.topLeft();
+    QPointF tr = scrollOffset + rect.topRight();
+    QPointF br = scrollOffset + rect.bottomRight();
+    QPointF bl = scrollOffset + rect.bottomLeft();
+
+    QPolygonF poly;
+    poly.resize(4);
+    if (!d->identityMatrix) {
+        QTransform x = d->matrix.inverted();
+        poly[0] = x.map(tl);
+        poly[1] = x.map(tr);
+        poly[2] = x.map(br);
+        poly[3] = x.map(bl);
+    } else {
+        poly[0] = tl;
+        poly[1] = tr;
+        poly[2] = br;
+        poly[3] = bl;
+    }
+    return poly;
+}
+
+/*!
+    \fn QGraphicsView::mapToScene(int x, int y, int w, int h) const
+
+    This function is provided for convenience. It's equivalent to calling
+    mapToScene(QRect(\a x, \a y, \a w, \a h)).
+*/
+
+/*!
+    Returns the viewport polygon \a polygon mapped to a scene coordinate
+    polygon.
+
+    \sa mapFromScene()
+*/
+QPolygonF QGraphicsView::mapToScene(const QPolygon &polygon) const
+{
+    QPolygonF poly;
+    foreach (const QPoint &point, polygon)
+        poly << mapToScene(point);
+    return poly;
+}
+
+/*!
+    Returns the viewport painter path \a path mapped to a scene coordinate
+    painter path.
+
+    \sa mapFromScene()
+*/
+QPainterPath QGraphicsView::mapToScene(const QPainterPath &path) const
+{
+    Q_D(const QGraphicsView);
+    QTransform moveMatrix;
+    moveMatrix.translate(d->horizontalScroll(), d->verticalScroll());
+    return (moveMatrix * d->matrix.inverted()).map(path);
+}
+
+/*!
+    Returns the scene coordinate \a point to viewport coordinates.
+
+    \sa mapToScene()
+*/
+QPoint QGraphicsView::mapFromScene(const QPointF &point) const
+{
+    Q_D(const QGraphicsView);
+    QPointF p = d->identityMatrix ? point : d->matrix.map(point);
+    p.rx() -= d->horizontalScroll();
+    p.ry() -= d->verticalScroll();
+    return p.toPoint();
+}
+
+/*!
+    \fn QGraphicsView::mapFromScene(qreal x, qreal y) const
+
+    This function is provided for convenience. It's equivalent to
+    calling mapFromScene(QPointF(\a x, \a y)).
+*/
+
+/*!
+    Returns the scene rectangle \a rect to a viewport coordinate
+    polygon.
+
+    \sa mapToScene()
+*/
+QPolygon QGraphicsView::mapFromScene(const QRectF &rect) const
+{
+    Q_D(const QGraphicsView);
+    QPointF tl;
+    QPointF tr;
+    QPointF br;
+    QPointF bl;
+    if (!d->identityMatrix) {
+        const QTransform &x = d->matrix;
+        tl = x.map(rect.topLeft());
+        tr = x.map(rect.topRight());
+        br = x.map(rect.bottomRight());
+        bl = x.map(rect.bottomLeft());
+    } else {
+        tl = rect.topLeft();
+        tr = rect.topRight();
+        br = rect.bottomRight();
+        bl = rect.bottomLeft();
+    }
+    QPointF scrollOffset(d->horizontalScroll(), d->verticalScroll());
+    tl -= scrollOffset;
+    tr -= scrollOffset;
+    br -= scrollOffset;
+    bl -= scrollOffset;
+
+    QPolygon poly;
+    poly.resize(4);
+    poly[0] = tl.toPoint();
+    poly[1] = tr.toPoint();
+    poly[2] = br.toPoint();
+    poly[3] = bl.toPoint();
+    return poly;
+}
+
+/*!
+    \fn QGraphicsView::mapFromScene(qreal x, qreal y, qreal w, qreal h) const
+
+    This function is provided for convenience. It's equivalent to
+    calling mapFromScene(QRectF(\a x, \a y, \a w, \a h)).
+*/
+
+/*!
+    Returns the scene coordinate polygon \a polygon to a viewport coordinate
+    polygon.
+
+    \sa mapToScene()
+*/
+QPolygon QGraphicsView::mapFromScene(const QPolygonF &polygon) const
+{
+    QPolygon poly;
+    foreach (const QPointF &point, polygon)
+        poly << mapFromScene(point);
+    return poly;
+}
+
+/*!
+    Returns the scene coordinate painter path \a path to a viewport coordinate
+    painter path.
+
+    \sa mapToScene()
+*/
+QPainterPath QGraphicsView::mapFromScene(const QPainterPath &path) const
+{
+    Q_D(const QGraphicsView);
+    QTransform moveMatrix;
+    moveMatrix.translate(-d->horizontalScroll(), -d->verticalScroll());
+    return (d->matrix * moveMatrix).map(path);
+}
+
+/*!
+    \reimp
+*/
+QVariant QGraphicsView::inputMethodQuery(Qt::InputMethodQuery query) const
+{
+    Q_D(const QGraphicsView);
+    if (!d->scene)
+        return QVariant();
+
+    QVariant value = d->scene->inputMethodQuery(query);
+    if (value.type() == QVariant::RectF)
+        value = mapFromScene(value.toRectF()).boundingRect();
+    else if (value.type() == QVariant::PointF)
+        value = mapFromScene(value.toPointF());
+    else if (value.type() == QVariant::Rect)
+        value = mapFromScene(value.toRect()).boundingRect();
+    else if (value.type() == QVariant::Point)
+        value = mapFromScene(value.toPoint());
+    return value;
+}
+
+/*!
+    \property QGraphicsView::backgroundBrush
+    \brief the background brush of the scene.
+
+    This property sets the background brush for the scene in this view. It is
+    used to override the scene's own background, and defines the behavior of
+    drawBackground(). To provide custom background drawing for this view, you
+    can reimplement drawBackground() instead.
+
+    By default, this property contains a brush with the Qt::NoBrush pattern.
+
+    \sa QGraphicsScene::backgroundBrush, foregroundBrush
+*/
+QBrush QGraphicsView::backgroundBrush() const
+{
+    Q_D(const QGraphicsView);
+    return d->backgroundBrush;
+}
+void QGraphicsView::setBackgroundBrush(const QBrush &brush)
+{
+    Q_D(QGraphicsView);
+    d->backgroundBrush = brush;
+    viewport()->update();
+
+    if (d->cacheMode & CacheBackground) {
+        // Invalidate the background pixmap
+        d->mustResizeBackgroundPixmap = true;
+    }
+}
+
+/*!
+    \property QGraphicsView::foregroundBrush
+    \brief the foreground brush of the scene.
+
+    This property sets the foreground brush for the scene in this view. It is
+    used to override the scene's own foreground, and defines the behavior of
+    drawForeground(). To provide custom foreground drawing for this view, you
+    can reimplement drawForeground() instead.
+
+    By default, this property contains a brush with the Qt::NoBrush pattern.
+
+    \sa QGraphicsScene::foregroundBrush, backgroundBrush
+*/
+QBrush QGraphicsView::foregroundBrush() const
+{
+    Q_D(const QGraphicsView);
+    return d->foregroundBrush;
+}
+void QGraphicsView::setForegroundBrush(const QBrush &brush)
+{
+    Q_D(QGraphicsView);
+    d->foregroundBrush = brush;
+    viewport()->update();
+}
+
+/*!
+    Schedules an update of the scene rectangles \a rects.
+
+    \sa QGraphicsScene::changed()
+*/
+void QGraphicsView::updateScene(const QList<QRectF> &rects)
+{
+    // ### Note: Since 4.5, this slot is only called if the user explicitly
+    // establishes a connection between the scene and the view, as the scene
+    // and view are no longer connected. We need to keep it working (basically
+    // leave it as it is), but the new delivery path is through
+    // QGraphicsScenePrivate::itemUpdate().
+    Q_D(QGraphicsView);
+    if (d->fullUpdatePending || d->viewportUpdateMode == QGraphicsView::NoViewportUpdate)
+        return;
+
+    // Extract and reset dirty scene rect info.
+    QVector<QRect> dirtyViewportRects;
+    for (int i = 0; i < d->dirtyRegions.size(); ++i)
+        dirtyViewportRects += d->dirtyRegions.at(i).rects();
+    d->dirtyRegions.clear();
+
+    bool fullUpdate = !d->accelerateScrolling || d->viewportUpdateMode == QGraphicsView::FullViewportUpdate;
+    bool boundingRectUpdate = (d->viewportUpdateMode == QGraphicsView::BoundingRectViewportUpdate)
+                              || (d->viewportUpdateMode == QGraphicsView::SmartViewportUpdate
+                                  && ((dirtyViewportRects.size() + rects.size()) >= QGRAPHICSVIEW_REGION_RECT_THRESHOLD));
+
+    QRegion updateRegion;
+    QRect boundingRect;
+    QRect viewportRect = viewport()->rect();
+    bool redraw = false;
+    QTransform transform = viewportTransform();
+
+    // Convert scene rects to viewport rects.
+    foreach (const QRectF &rect, rects) {
+        QRect xrect = transform.mapRect(rect).toRect();
+        if (!(d->optimizationFlags & DontAdjustForAntialiasing))
+            xrect.adjust(-2, -2, 2, 2);
+        if (!viewportRect.intersects(xrect))
+            continue;
+        dirtyViewportRects << xrect;
+    }
+
+    foreach (const QRect &rect, dirtyViewportRects) {
+        // Add the exposed rect to the update region. In rect update
+        // mode, we only count the bounding rect of items.
+        if (!boundingRectUpdate) {
+            updateRegion += rect;
+        } else {
+            boundingRect |= rect;
+        }
+        redraw = true;
+        if (fullUpdate) {
+            // If fullUpdate is true and we found a visible dirty rect,
+            // we're done.
+            break;
+        }
+    }
+
+    if (!redraw)
+        return;
+
+    if (fullUpdate)
+        viewport()->update();
+    else if (boundingRectUpdate)
+        viewport()->update(boundingRect);
+    else
+        viewport()->update(updateRegion);
+}
+
+/*!
+    Notifies QGraphicsView that the scene's scene rect has changed.  \a rect
+    is the new scene rect. If the view already has an explicitly set scene
+    rect, this function does nothing.
+
+    \sa sceneRect, QGraphicsScene::sceneRectChanged()
+*/
+void QGraphicsView::updateSceneRect(const QRectF &rect)
+{
+    Q_D(QGraphicsView);
+    if (!d->hasSceneRect) {
+        d->sceneRect = rect;
+        d->recalculateContentSize();
+    }
+}
+
+/*!
+    This slot is called by QAbstractScrollArea after setViewport() has been
+    called. Reimplement this function in a subclass of QGraphicsView to
+    initialize the new viewport \a widget before it is used.
+
+    \sa setViewport()
+*/
+void QGraphicsView::setupViewport(QWidget *widget)
+{
+    Q_D(QGraphicsView);
+
+    if (!widget) {
+        qWarning("QGraphicsView::setupViewport: cannot initialize null widget");
+        return;
+    }
+
+    const bool isGLWidget = widget->inherits("QGLWidget");
+
+    d->accelerateScrolling = !(isGLWidget
+                               || widget->testAttribute(Qt::WA_MSWindowsUseDirect3D)
+                               || qApp->testAttribute(Qt::AA_MSWindowsUseDirect3DByDefault));
+
+    widget->setFocusPolicy(Qt::StrongFocus);
+
+    if (!isGLWidget) {
+        // autoFillBackground enables scroll acceleration.
+        widget->setAutoFillBackground(true);
+    }
+
+    widget->setMouseTracking(true);
+    widget->setAcceptDrops(acceptDrops());
+}
+
+/*!
+    \reimp
+*/
+bool QGraphicsView::event(QEvent *event)
+{
+    Q_D(QGraphicsView);
+
+    if (d->sceneInteractionAllowed) {
+        switch (event->type()) {
+        case QEvent::ShortcutOverride:
+            if (d->scene)
+                return QApplication::sendEvent(d->scene, event);
+            break;
+        case QEvent::KeyPress:
+            if (d->scene) {
+                QKeyEvent *k = static_cast<QKeyEvent *>(event);
+                if (k->key() == Qt::Key_Tab || k->key() == Qt::Key_Backtab) {
+                    // Send the key events to the scene. This will invoke the
+                    // scene's tab focus handling, and if the event is
+                    // accepted, we return (prevent further event delivery),
+                    // and the base implementation will call QGraphicsView's
+                    // focusNextPrevChild() function. If the event is ignored,
+                    // we fall back to standard tab focus handling.
+                    QApplication::sendEvent(d->scene, event);
+                    if (event->isAccepted())
+                        return true;
+                    // Ensure the event doesn't propagate just because the
+                    // scene ignored it. If the event propagates, then tab
+                    // handling will be called twice (this and parent).
+                    event->accept();
+                }
+            }
+            break;
+        default:
+            break;
+        }
+    }
+
+    return QAbstractScrollArea::event(event);
+}
+
+/*!
+    \reimp
+*/
+bool QGraphicsView::viewportEvent(QEvent *event)
+{
+    Q_D(QGraphicsView);
+
+    if (!d->scene)
+        return QAbstractScrollArea::viewportEvent(event);
+
+    switch (event->type()) {
+    case QEvent::Enter:
+        QApplication::sendEvent(d->scene, event);
+        break;
+    case QEvent::WindowActivate:
+        QApplication::sendEvent(d->scene, event);
+        break;
+    case QEvent::WindowDeactivate:
+        // ### This is a temporary fix for until we get proper mouse
+        // grab events. mouseGrabberItem should be set to 0 if we lose
+        // the mouse grab.
+        // Remove all popups when the scene loses focus.
+        if (!d->scene->d_func()->popupWidgets.isEmpty())
+            d->scene->d_func()->removePopup(d->scene->d_func()->popupWidgets.first());
+        QApplication::sendEvent(d->scene, event);
+        break;
+    case QEvent::Leave:
+        // ### This is a temporary fix for until we get proper mouse grab
+        // events. activeMouseGrabberItem should be set to 0 if we lose the
+        // mouse grab.
+        if ((QApplication::activePopupWidget() && QApplication::activePopupWidget() != window())
+            || (QApplication::activeModalWidget() && QApplication::activeModalWidget() != window())
+            || (QApplication::activeWindow() != window())) {
+            if (!d->scene->d_func()->popupWidgets.isEmpty())
+                d->scene->d_func()->removePopup(d->scene->d_func()->popupWidgets.first());
+        }
+        d->useLastMouseEvent = false;
+        QApplication::sendEvent(d->scene, event);
+        break;
+#ifndef QT_NO_TOOLTIP
+    case QEvent::ToolTip: {
+        QHelpEvent *toolTip = static_cast<QHelpEvent *>(event);
+        QGraphicsSceneHelpEvent helpEvent(QEvent::GraphicsSceneHelp);
+        helpEvent.setWidget(viewport());
+        helpEvent.setScreenPos(toolTip->globalPos());
+        helpEvent.setScenePos(mapToScene(toolTip->pos()));
+        QApplication::sendEvent(d->scene, &helpEvent);
+        toolTip->setAccepted(helpEvent.isAccepted());
+        return true;
+    }
+#endif
+    case QEvent::Paint:
+        // Reset full update
+        d->fullUpdatePending = false;
+        if (d->scene) {
+            // Check if this view reimplements the updateScene slot; if it
+            // does, we can't do direct update delivery and have to fall back
+            // to connecting the changed signal.
+            if (!d->updateSceneSlotReimplementedChecked) {
+                d->updateSceneSlotReimplementedChecked = true;
+                const QMetaObject *mo = metaObject();
+                if (mo != &QGraphicsView::staticMetaObject) {
+                    if (mo->indexOfSlot("updateScene(QList<QRectF>)")
+                        != QGraphicsView::staticMetaObject.indexOfSlot("updateScene(QList<QRectF>)")) {
+                        connect(d->scene, SIGNAL(changed(QList<QRectF>)),
+                                this, SLOT(updateScene(QList<QRectF>)));
+                    }
+                }
+            }
+            d->scene->d_func()->updateAll = false;
+        }
+        break;
+    default:
+        break;
+    }
+
+    return QAbstractScrollArea::viewportEvent(event);
+}
+
+#ifndef QT_NO_CONTEXTMENU
+/*!
+    \reimp
+*/
+void QGraphicsView::contextMenuEvent(QContextMenuEvent *event)
+{
+    Q_D(QGraphicsView);
+    if (!d->scene || !d->sceneInteractionAllowed)
+        return;
+
+    d->mousePressViewPoint = event->pos();
+    d->mousePressScenePoint = mapToScene(d->mousePressViewPoint);
+    d->mousePressScreenPoint = event->globalPos();
+    d->lastMouseMoveScenePoint = d->mousePressScenePoint;
+    d->lastMouseMoveScreenPoint = d->mousePressScreenPoint;
+
+    QGraphicsSceneContextMenuEvent contextEvent(QEvent::GraphicsSceneContextMenu);
+    contextEvent.setWidget(viewport());
+    contextEvent.setScenePos(d->mousePressScenePoint);
+    contextEvent.setScreenPos(d->mousePressScreenPoint);
+    contextEvent.setModifiers(event->modifiers());
+    contextEvent.setReason((QGraphicsSceneContextMenuEvent::Reason)(event->reason()));
+    contextEvent.setAccepted(event->isAccepted());
+    QApplication::sendEvent(d->scene, &contextEvent);
+    event->setAccepted(contextEvent.isAccepted());
+}
+#endif // QT_NO_CONTEXTMENU
+
+/*!
+    \reimp
+*/
+void QGraphicsView::dropEvent(QDropEvent *event)
+{
+#ifndef QT_NO_DRAGANDDROP
+    Q_D(QGraphicsView);
+    if (!d->scene || !d->sceneInteractionAllowed)
+        return;
+
+    // Generate a scene event.
+    QGraphicsSceneDragDropEvent sceneEvent(QEvent::GraphicsSceneDrop);
+    d->populateSceneDragDropEvent(&sceneEvent, event);
+
+    // Send it to the scene.
+    QApplication::sendEvent(d->scene, &sceneEvent);
+
+    // Accept the originating event if the scene accepted the scene event.
+    event->setAccepted(sceneEvent.isAccepted());
+    if (sceneEvent.isAccepted())
+        event->setDropAction(sceneEvent.dropAction());
+
+    delete d->lastDragDropEvent;
+    d->lastDragDropEvent = 0;
+
+#else
+    Q_UNUSED(event)
+#endif
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsView::dragEnterEvent(QDragEnterEvent *event)
+{
+#ifndef QT_NO_DRAGANDDROP
+    Q_D(QGraphicsView);
+    if (!d->scene || !d->sceneInteractionAllowed)
+        return;
+
+    // Disable replaying of mouse move events.
+    d->useLastMouseEvent = false;
+
+    // Generate a scene event.
+    QGraphicsSceneDragDropEvent sceneEvent(QEvent::GraphicsSceneDragEnter);
+    d->populateSceneDragDropEvent(&sceneEvent, event);
+
+    // Store it for later use.
+    d->storeDragDropEvent(&sceneEvent);
+
+    // Send it to the scene.
+    QApplication::sendEvent(d->scene, &sceneEvent);
+
+    // Accept the originating event if the scene accepted the scene event.
+    if (sceneEvent.isAccepted()) {
+        event->setAccepted(true);
+        event->setDropAction(sceneEvent.dropAction());
+    }
+#else
+    Q_UNUSED(event)
+#endif
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsView::dragLeaveEvent(QDragLeaveEvent *event)
+{
+#ifndef QT_NO_DRAGANDDROP
+    Q_D(QGraphicsView);
+    if (!d->scene || !d->sceneInteractionAllowed)
+        return;
+    if (!d->lastDragDropEvent) {
+        qWarning("QGraphicsView::dragLeaveEvent: drag leave received before drag enter");
+        return;
+    }
+
+    // Generate a scene event.
+    QGraphicsSceneDragDropEvent sceneEvent(QEvent::GraphicsSceneDragLeave);
+    sceneEvent.setScenePos(d->lastDragDropEvent->scenePos());
+    sceneEvent.setScreenPos(d->lastDragDropEvent->screenPos());
+    sceneEvent.setButtons(d->lastDragDropEvent->buttons());
+    sceneEvent.setModifiers(d->lastDragDropEvent->modifiers());
+    sceneEvent.setPossibleActions(d->lastDragDropEvent->possibleActions());
+    sceneEvent.setProposedAction(d->lastDragDropEvent->proposedAction());
+    sceneEvent.setDropAction(d->lastDragDropEvent->dropAction());
+    sceneEvent.setMimeData(d->lastDragDropEvent->mimeData());
+    sceneEvent.setWidget(d->lastDragDropEvent->widget());
+    sceneEvent.setSource(d->lastDragDropEvent->source());
+    delete d->lastDragDropEvent;
+    d->lastDragDropEvent = 0;
+
+    // Send it to the scene.
+    QApplication::sendEvent(d->scene, &sceneEvent);
+
+    // Accept the originating event if the scene accepted the scene event.
+    if (sceneEvent.isAccepted())
+        event->setAccepted(true);
+#else
+    Q_UNUSED(event)
+#endif
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsView::dragMoveEvent(QDragMoveEvent *event)
+{
+#ifndef QT_NO_DRAGANDDROP
+    Q_D(QGraphicsView);
+    if (!d->scene || !d->sceneInteractionAllowed)
+        return;
+
+    // Generate a scene event.
+    QGraphicsSceneDragDropEvent sceneEvent(QEvent::GraphicsSceneDragMove);
+    d->populateSceneDragDropEvent(&sceneEvent, event);
+
+    // Store it for later use.
+    d->storeDragDropEvent(&sceneEvent);
+
+    // Send it to the scene.
+    QApplication::sendEvent(d->scene, &sceneEvent);
+
+    // Ignore the originating event if the scene ignored the scene event.
+    event->setAccepted(sceneEvent.isAccepted());
+    if (sceneEvent.isAccepted())
+        event->setDropAction(sceneEvent.dropAction());
+#else
+    Q_UNUSED(event)
+#endif
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsView::focusInEvent(QFocusEvent *event)
+{
+    Q_D(QGraphicsView);
+    QAbstractScrollArea::focusInEvent(event);
+    if (d->scene)
+        QApplication::sendEvent(d->scene, event);
+    // Pass focus on if the scene cannot accept focus.
+    if (!d->scene || !event->isAccepted())
+        QAbstractScrollArea::focusInEvent(event);
+}
+
+/*!
+    \reimp
+*/
+bool QGraphicsView::focusNextPrevChild(bool next)
+{
+    return QAbstractScrollArea::focusNextPrevChild(next);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsView::focusOutEvent(QFocusEvent *event)
+{
+    Q_D(QGraphicsView);
+    QAbstractScrollArea::focusOutEvent(event);
+    if (d->scene)
+        QApplication::sendEvent(d->scene, event);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsView::keyPressEvent(QKeyEvent *event)
+{
+    Q_D(QGraphicsView);
+    if (!d->scene || !d->sceneInteractionAllowed) {
+        QAbstractScrollArea::keyPressEvent(event);
+        return;
+    }
+    QApplication::sendEvent(d->scene, event);
+    if (!event->isAccepted())
+        QAbstractScrollArea::keyPressEvent(event);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsView::keyReleaseEvent(QKeyEvent *event)
+{
+    Q_D(QGraphicsView);
+    if (!d->scene || !d->sceneInteractionAllowed)
+        return;
+    QApplication::sendEvent(d->scene, event);
+    if (!event->isAccepted())
+        QAbstractScrollArea::keyReleaseEvent(event);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsView::mouseDoubleClickEvent(QMouseEvent *event)
+{
+    Q_D(QGraphicsView);
+    if (!d->scene || !d->sceneInteractionAllowed)
+        return;
+
+    d->storeMouseEvent(event);
+    d->mousePressViewPoint = event->pos();
+    d->mousePressScenePoint = mapToScene(d->mousePressViewPoint);
+    d->mousePressScreenPoint = event->globalPos();
+    d->lastMouseMoveScenePoint = d->mousePressScenePoint;
+    d->lastMouseMoveScreenPoint = d->mousePressScreenPoint;
+    d->mousePressButton = event->button();
+
+    QGraphicsSceneMouseEvent mouseEvent(QEvent::GraphicsSceneMouseDoubleClick);
+    mouseEvent.setWidget(viewport());
+    mouseEvent.setButtonDownScenePos(d->mousePressButton, d->mousePressScenePoint);
+    mouseEvent.setButtonDownScreenPos(d->mousePressButton, d->mousePressScreenPoint);
+    mouseEvent.setScenePos(mapToScene(d->mousePressViewPoint));
+    mouseEvent.setScreenPos(d->mousePressScreenPoint);
+    mouseEvent.setLastScenePos(d->lastMouseMoveScenePoint);
+    mouseEvent.setLastScreenPos(d->lastMouseMoveScreenPoint);
+    mouseEvent.setButtons(event->buttons());
+    mouseEvent.setButtons(event->buttons());
+    mouseEvent.setAccepted(false);
+    mouseEvent.setButton(event->button());
+    mouseEvent.setModifiers(event->modifiers());
+    QApplication::sendEvent(d->scene, &mouseEvent);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsView::mousePressEvent(QMouseEvent *event)
+{
+    Q_D(QGraphicsView);
+
+    // Store this event for replaying, finding deltas, and for
+    // scroll-dragging; even in non-interactive mode, scroll hand dragging is
+    // allowed, so we store the event at the very top of this function.
+    d->storeMouseEvent(event);
+    d->lastMouseEvent.setAccepted(false);
+
+    if (d->sceneInteractionAllowed) {
+        // Store some of the event's button-down data.
+        d->mousePressViewPoint = event->pos();
+        d->mousePressScenePoint = mapToScene(d->mousePressViewPoint);
+        d->mousePressScreenPoint = event->globalPos();
+        d->lastMouseMoveScenePoint = d->mousePressScenePoint;
+        d->lastMouseMoveScreenPoint = d->mousePressScreenPoint;
+        d->mousePressButton = event->button();
+
+        if (d->scene) {
+            // Convert and deliver the mouse event to the scene.
+            QGraphicsSceneMouseEvent mouseEvent(QEvent::GraphicsSceneMousePress);
+            mouseEvent.setWidget(viewport());
+            mouseEvent.setButtonDownScenePos(d->mousePressButton, d->mousePressScenePoint);
+            mouseEvent.setButtonDownScreenPos(d->mousePressButton, d->mousePressScreenPoint);
+            mouseEvent.setScenePos(d->mousePressScenePoint);
+            mouseEvent.setScreenPos(d->mousePressScreenPoint);
+            mouseEvent.setLastScenePos(d->lastMouseMoveScenePoint);
+            mouseEvent.setLastScreenPos(d->lastMouseMoveScreenPoint);
+            mouseEvent.setButtons(event->buttons());
+            mouseEvent.setButton(event->button());
+            mouseEvent.setModifiers(event->modifiers());
+            mouseEvent.setAccepted(false);
+            QApplication::sendEvent(d->scene, &mouseEvent);
+
+            // Update the original mouse event accepted state.
+            bool isAccepted = mouseEvent.isAccepted();
+            event->setAccepted(isAccepted);
+
+            // Update the last mouse event accepted state.
+            d->lastMouseEvent.setAccepted(isAccepted);
+
+            if (isAccepted)
+                return;
+        }
+    }
+
+#ifndef QT_NO_RUBBERBAND
+    if (d->dragMode == QGraphicsView::RubberBandDrag && !d->rubberBanding) {
+        if (d->sceneInteractionAllowed) {
+            // Rubberbanding is only allowed in interactive mode.
+            event->accept();
+            d->rubberBanding = true;
+            d->rubberBandRect = QRect();
+            if (d->scene) {
+                // Initiating a rubber band always clears the selection.
+                d->scene->clearSelection();
+            }
+        }
+    } else
+#endif
+        if (d->dragMode == QGraphicsView::ScrollHandDrag && event->button() == Qt::LeftButton) {
+            // Left-button press in scroll hand mode initiates hand scrolling.
+            event->accept();
+            d->handScrolling = true;
+            d->handScrollMotions = 0;
+#ifndef QT_NO_CURSOR
+            viewport()->setCursor(Qt::ClosedHandCursor);
+#endif
+        }
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsView::mouseMoveEvent(QMouseEvent *event)
+{
+    Q_D(QGraphicsView);
+
+#ifndef QT_NO_RUBBERBAND
+    if (d->dragMode == QGraphicsView::RubberBandDrag && d->sceneInteractionAllowed) {
+        d->storeMouseEvent(event);
+        if (d->rubberBanding) {
+            // Check for enough drag distance
+            if ((d->mousePressViewPoint - event->pos()).manhattanLength()
+                < QApplication::startDragDistance()) {
+                return;
+            }
+
+            // Update old rubberband
+            if (d->viewportUpdateMode != QGraphicsView::NoViewportUpdate && !d->rubberBandRect.isNull()) {
+                if (d->viewportUpdateMode != FullViewportUpdate)
+                    viewport()->update(d->rubberBandRegion(viewport(), d->rubberBandRect));
+                else
+                    viewport()->update();
+            }
+
+            // Stop rubber banding if the user has let go of all buttons (even
+            // if we didn't get the release events).
+            if (!event->buttons()) {
+                d->rubberBanding = false;
+                d->rubberBandRect = QRect();
+                return;
+            }
+
+            // Update rubberband position
+            const QPoint &mp = d->mousePressViewPoint;
+            QPoint ep = event->pos();
+            d->rubberBandRect = QRect(qMin(mp.x(), ep.x()), qMin(mp.y(), ep.y()),
+                                      qAbs(mp.x() - ep.x()) + 1, qAbs(mp.y() - ep.y()) + 1);
+
+            // Update new rubberband
+            if (d->viewportUpdateMode != QGraphicsView::NoViewportUpdate){
+                if (d->viewportUpdateMode != FullViewportUpdate)
+                    viewport()->update(d->rubberBandRegion(viewport(), d->rubberBandRect));
+                else
+                    viewport()->update();
+            }
+            // Set the new selection area
+            QPainterPath selectionArea;
+            selectionArea.addPolygon(mapToScene(d->rubberBandRect));
+            selectionArea.closeSubpath();
+            if (d->scene)
+                d->scene->setSelectionArea(selectionArea, d->rubberBandSelectionMode);
+            return;
+        }
+    } else
+#endif // QT_NO_RUBBERBAND
+    if (d->dragMode == QGraphicsView::ScrollHandDrag) {
+        if (d->handScrolling) {
+            QScrollBar *hBar = horizontalScrollBar();
+            QScrollBar *vBar = verticalScrollBar();
+            QPoint delta = event->pos() - d->lastMouseEvent.pos();
+            hBar->setValue(hBar->value() + (isRightToLeft() ? delta.x() : -delta.x()));
+            vBar->setValue(vBar->value() - delta.y());
+
+            // Detect how much we've scrolled to disambiguate scrolling from
+            // clicking.
+            ++d->handScrollMotions;
+        }
+    }
+
+    d->mouseMoveEventHandler(event);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsView::mouseReleaseEvent(QMouseEvent *event)
+{
+    Q_D(QGraphicsView);
+
+#ifndef QT_NO_RUBBERBAND
+    if (d->dragMode == QGraphicsView::RubberBandDrag && d->sceneInteractionAllowed && !event->buttons()) {
+        if (d->rubberBanding) {
+            if (d->viewportUpdateMode != QGraphicsView::NoViewportUpdate){
+                if (d->viewportUpdateMode != FullViewportUpdate)
+                    viewport()->update(d->rubberBandRegion(viewport(), d->rubberBandRect));
+                else
+                    viewport()->update();
+            }
+            d->rubberBanding = false;
+            d->rubberBandRect = QRect();
+        }
+    } else
+#endif
+    if (d->dragMode == QGraphicsView::ScrollHandDrag) {
+#ifndef QT_NO_CURSOR
+        // Restore the open hand cursor. ### There might be items
+        // under the mouse that have a valid cursor at this time, so
+        // we could repeat the steps from mouseMoveEvent().
+        viewport()->setCursor(Qt::OpenHandCursor);
+#endif
+        d->handScrolling = false;
+
+        if (d->scene && d->sceneInteractionAllowed && !d->lastMouseEvent.isAccepted() && d->handScrollMotions <= 6) {
+            // If we've detected very little motion during the hand drag, and
+            // no item accepted the last event, we'll interpret that as a
+            // click to the scene, and reset the selection.
+            d->scene->clearSelection();
+        }
+    }
+
+    d->storeMouseEvent(event);
+
+    if (!d->sceneInteractionAllowed)
+        return;
+
+    if (!d->scene)
+        return;
+
+    QGraphicsSceneMouseEvent mouseEvent(QEvent::GraphicsSceneMouseRelease);
+    mouseEvent.setWidget(viewport());
+    mouseEvent.setButtonDownScenePos(d->mousePressButton, d->mousePressScenePoint);
+    mouseEvent.setButtonDownScreenPos(d->mousePressButton, d->mousePressScreenPoint);
+    mouseEvent.setScenePos(mapToScene(event->pos()));
+    mouseEvent.setScreenPos(event->globalPos());
+    mouseEvent.setLastScenePos(d->lastMouseMoveScenePoint);
+    mouseEvent.setLastScreenPos(d->lastMouseMoveScreenPoint);
+    mouseEvent.setButtons(event->buttons());
+    mouseEvent.setButton(event->button());
+    mouseEvent.setModifiers(event->modifiers());
+    mouseEvent.setAccepted(false);
+    QApplication::sendEvent(d->scene, &mouseEvent);
+
+    // Update the last mouse event selected state.
+    d->lastMouseEvent.setAccepted(mouseEvent.isAccepted());
+
+#ifndef QT_NO_CURSOR
+    if (mouseEvent.isAccepted() && mouseEvent.buttons() == 0 && viewport()->testAttribute(Qt::WA_SetCursor)) {
+        // The last mouse release on the viewport will trigger clearing the cursor.
+        d->_q_unsetViewportCursor();
+    }
+#endif
+}
+
+#ifndef QT_NO_WHEELEVENT
+/*!
+    \reimp
+*/
+void QGraphicsView::wheelEvent(QWheelEvent *event)
+{
+    Q_D(QGraphicsView);
+    if (!d->scene || !d->sceneInteractionAllowed) {
+        QAbstractScrollArea::wheelEvent(event);
+        return;
+    }
+
+    event->ignore();
+
+    QGraphicsSceneWheelEvent wheelEvent(QEvent::GraphicsSceneWheel);
+    wheelEvent.setWidget(viewport());
+    wheelEvent.setScenePos(mapToScene(event->pos()));
+    wheelEvent.setScreenPos(event->globalPos());
+    wheelEvent.setButtons(event->buttons());
+    wheelEvent.setModifiers(event->modifiers());
+    wheelEvent.setDelta(event->delta());
+    wheelEvent.setOrientation(event->orientation());
+    wheelEvent.setAccepted(false);
+    QApplication::sendEvent(d->scene, &wheelEvent);
+    event->setAccepted(wheelEvent.isAccepted());
+    if (!event->isAccepted())
+        QAbstractScrollArea::wheelEvent(event);
+}
+#endif // QT_NO_WHEELEVENT
+
+/*!
+    \reimp
+*/
+void QGraphicsView::paintEvent(QPaintEvent *event)
+{
+    Q_D(QGraphicsView);
+    if (!d->scene) {
+        QAbstractScrollArea::paintEvent(event);
+        return;
+    }
+
+    // Set up painter state protection.
+    d->scene->d_func()->painterStateProtection = !(d->optimizationFlags & DontSavePainterState);
+
+    // Determine the exposed region
+    QRegion exposedRegion = event->region();
+    if (!d->accelerateScrolling)
+        exposedRegion = viewport()->rect();
+    else if (d->viewportUpdateMode == BoundingRectViewportUpdate)
+        exposedRegion = event->rect();
+    QRectF exposedSceneRect = mapToScene(exposedRegion.boundingRect().adjusted(0, 0, 1, 1)).boundingRect();
+
+    // Set up the painter
+    QPainter painter(viewport());
+    QTransform original = painter.worldTransform();
+#ifndef QT_NO_RUBBERBAND
+    if (d->rubberBanding && !d->rubberBandRect.isNull())
+        painter.save();
+#endif
+    // Set up render hints
+    painter.setRenderHints(painter.renderHints(), false);
+    painter.setRenderHints(d->renderHints, true);
+
+    // Set up viewport transform
+    const QTransform viewTransform = viewportTransform();
+    painter.setTransform(viewTransform, true);
+
+#ifdef QGRAPHICSVIEW_DEBUG
+    QTime stopWatch;
+    stopWatch.start();
+    qDebug() << "QGraphicsView::paintEvent(" << exposedRegion << ")";
+#endif
+
+    // Find all exposed items
+    bool allItems = false;
+    QList<QGraphicsItem *> itemList = d->findItems(exposedRegion, viewTransform, &allItems);
+
+#ifdef QGRAPHICSVIEW_DEBUG
+    int exposedTime = stopWatch.elapsed();
+#endif
+
+    if ((d->cacheMode & CacheBackground)
+#ifdef Q_WS_X11
+        && X11->use_xrender
+#endif
+        ) {
+        // Recreate the background pixmap, and flag the whole background as
+        // exposed.
+        if (d->mustResizeBackgroundPixmap) {
+            d->backgroundPixmap = QPixmap(viewport()->size());
+            QBrush bgBrush = viewport()->palette().brush(viewport()->backgroundRole());
+            if (!bgBrush.isOpaque())
+                d->backgroundPixmap.fill(Qt::transparent);
+            QPainter p(&d->backgroundPixmap);
+            p.fillRect(0, 0, d->backgroundPixmap.width(), d->backgroundPixmap.height(), bgBrush);
+            d->backgroundPixmapExposed = QRegion(viewport()->rect());
+            d->mustResizeBackgroundPixmap = false;
+        }
+
+        // Redraw exposed areas
+        if (!d->backgroundPixmapExposed.isEmpty()) {
+            QPainter backgroundPainter(&d->backgroundPixmap);
+            backgroundPainter.setClipRegion(d->backgroundPixmapExposed, Qt::ReplaceClip);
+            backgroundPainter.setTransform(viewportTransform());
+            drawBackground(&backgroundPainter, exposedSceneRect);
+            d->backgroundPixmapExposed = QRegion();
+        }
+
+        // Blit the background from the background pixmap
+        QTransform oldMatrix = painter.worldTransform();
+        painter.setWorldTransform(original);
+        painter.drawPixmap(QPoint(), d->backgroundPixmap);
+        painter.setWorldTransform(oldMatrix);
+    } else {
+        if (!(d->optimizationFlags & DontSavePainterState))
+            painter.save();
+        drawBackground(&painter, exposedSceneRect);
+        if (!(d->optimizationFlags & DontSavePainterState))
+            painter.restore();
+    }
+
+#ifdef QGRAPHICSVIEW_DEBUG
+    int backgroundTime = stopWatch.elapsed() - exposedTime;
+#endif
+
+    // Generate the style options
+    QGraphicsItem **itemArray = new QGraphicsItem *[itemList.size()];
+    QStyleOptionGraphicsItem *styleOptionArray = d->allocStyleOptionsArray(itemList.size());
+
+    d->generateStyleOptions(itemList, itemArray, styleOptionArray, viewTransform,
+                            allItems, exposedRegion);
+
+    // Items
+    drawItems(&painter, itemList.size(), itemArray, styleOptionArray);
+
+#ifdef QGRAPHICSVIEW_DEBUG
+    int itemsTime = stopWatch.elapsed() - exposedTime - backgroundTime;
+#endif
+
+    // Foreground
+    drawForeground(&painter, exposedSceneRect);
+
+    delete [] itemArray;
+    d->freeStyleOptionsArray(styleOptionArray);
+
+#ifdef QGRAPHICSVIEW_DEBUG
+    int foregroundTime = stopWatch.elapsed() - exposedTime - backgroundTime - itemsTime;
+#endif
+
+#ifndef QT_NO_RUBBERBAND
+    // Rubberband
+    if (d->rubberBanding && !d->rubberBandRect.isNull()) {
+        painter.restore();
+        QStyleOptionRubberBand option;
+        option.initFrom(viewport());
+        option.rect = d->rubberBandRect;
+        option.shape = QRubberBand::Rectangle;
+
+        QStyleHintReturnMask mask;
+        if (viewport()->style()->styleHint(QStyle::SH_RubberBand_Mask, &option, viewport(), &mask)) {
+            // painter clipping for masked rubberbands
+            painter.setClipRegion(mask.region, Qt::IntersectClip);
+        }
+
+        viewport()->style()->drawControl(QStyle::CE_RubberBand, &option, &painter, viewport());
+    }
+#endif
+
+    painter.end();
+
+#ifdef QGRAPHICSVIEW_DEBUG
+    qDebug() << "\tItem discovery....... " << exposedTime << "msecs (" << itemList.size() << "items,"
+             << (exposedTime > 0 ? (itemList.size() * 1000.0 / exposedTime) : -1) << "/ sec )";
+    qDebug() << "\tDrawing background... " << backgroundTime << "msecs (" << exposedRegion.numRects() << "segments )";
+    qDebug() << "\tDrawing items........ " << itemsTime << "msecs ("
+             << (itemsTime > 0 ? (itemList.size() * 1000.0 / itemsTime) : -1) << "/ sec )";
+    qDebug() << "\tDrawing foreground... " << foregroundTime << "msecs (" << exposedRegion.numRects() << "segments )";
+    qDebug() << "\tTotal rendering time: " << stopWatch.elapsed() << "msecs ("
+             << (stopWatch.elapsed() > 0 ? (1000.0 / stopWatch.elapsed()) : -1.0) << "fps )";
+#endif
+
+    // Restore painter state protection.
+    d->scene->d_func()->painterStateProtection = true;
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsView::resizeEvent(QResizeEvent *event)
+{
+    Q_D(QGraphicsView);
+    // Save the last center point - the resize may scroll the view, which
+    // changes the center point.
+    QPointF oldLastCenterPoint = d->lastCenterPoint;
+
+    QAbstractScrollArea::resizeEvent(event);
+    d->recalculateContentSize();
+
+    // Restore the center point again.
+    if (d->resizeAnchor == NoAnchor && !d->keepLastCenterPoint) {
+        d->updateLastCenterPoint();
+    } else {
+        d->lastCenterPoint = oldLastCenterPoint;
+    }
+    d->centerView(d->resizeAnchor);
+    d->keepLastCenterPoint = false;
+
+    if (d->cacheMode & CacheBackground) {
+        // Invalidate the background pixmap
+        d->mustResizeBackgroundPixmap = true;
+    }
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsView::scrollContentsBy(int dx, int dy)
+{
+    Q_D(QGraphicsView);
+    d->dirtyScroll = true;
+    if (d->transforming)
+        return;
+    if (isRightToLeft())
+        dx = -dx;
+
+    if (d->viewportUpdateMode != QGraphicsView::NoViewportUpdate
+        && d->viewportUpdateMode != QGraphicsView::FullViewportUpdate) {
+        for (int i = 0; i < d->dirtyRects.size(); ++i)
+            d->dirtyRects[i].translate(dx, dy);
+        for (int i = 0; i < d->dirtyRegions.size(); ++i)
+            d->dirtyRegions[i].translate(dx, dy);
+    }
+
+#ifndef QT_NO_RUBBERBAND
+    // Update old rubberband
+    if (d->viewportUpdateMode != QGraphicsView::NoViewportUpdate && !d->rubberBandRect.isNull()) {
+        if (d->viewportUpdateMode != FullViewportUpdate)
+            viewport()->update(d->rubberBandRegion(viewport(), d->rubberBandRect));
+        else
+            viewport()->update();
+    }
+#endif
+
+    if (d->viewportUpdateMode != QGraphicsView::NoViewportUpdate){
+        if (d->accelerateScrolling && d->viewportUpdateMode != FullViewportUpdate)
+            viewport()->scroll(dx, dy);
+        else
+            viewport()->update();
+    }
+    d->updateLastCenterPoint();
+
+    if ((d->cacheMode & CacheBackground)
+#ifdef Q_WS_X11
+        && X11->use_xrender
+#endif
+        ) {
+        // Invalidate the background pixmap
+        d->backgroundPixmapExposed.translate(dx, 0);
+        if (dx > 0) {
+            d->backgroundPixmapExposed += QRect(0, 0, dx, viewport()->height());
+        } else if (dx < 0) {
+            d->backgroundPixmapExposed += QRect(viewport()->width() + dx, 0,
+                                                -dx, viewport()->height());
+        }
+        d->backgroundPixmapExposed.translate(0, dy);
+        if (dy > 0) {
+            d->backgroundPixmapExposed += QRect(0, 0, viewport()->width(), dy);
+        } else if (dy < 0) {
+            d->backgroundPixmapExposed += QRect(0, viewport()->height() + dy,
+                                                viewport()->width(), -dy);
+        }
+
+        // Scroll the background pixmap
+        if (!d->backgroundPixmap.isNull()) {
+            QPixmap tmp = d->backgroundPixmap.copy();
+            QBrush bgBrush = viewport()->palette().brush(viewport()->backgroundRole());
+            if (!bgBrush.isOpaque())
+                d->backgroundPixmap.fill(Qt::transparent);
+            QPainter painter(&d->backgroundPixmap);
+            painter.drawPixmap(dx, dy, tmp);
+        }
+    }
+
+    // Always replay on scroll.
+    if (d->sceneInteractionAllowed)
+        d->replayLastMouseEvent();
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsView::showEvent(QShowEvent *event)
+{
+    Q_D(QGraphicsView);
+    d->recalculateContentSize();
+    d->centerView(d->transformationAnchor);
+    QAbstractScrollArea::showEvent(event);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsView::inputMethodEvent(QInputMethodEvent *event)
+{
+    Q_D(QGraphicsView);
+    if (d->scene)
+        QApplication::sendEvent(d->scene, event);
+}
+
+/*!
+    Draws the background of the scene using \a painter, before any items and
+    the foreground are drawn. Reimplement this function to provide a custom
+    background for this view.
+
+    If all you want is to define a color, texture or gradient for the
+    background, you can call setBackgroundBrush() instead.
+
+    All painting is done in \e scene coordinates. \a rect is the exposed
+    rectangle.
+
+    The default implementation fills \a rect using the view's backgroundBrush.
+    If no such brush is defined (the default), the scene's drawBackground()
+    function is called instead.
+
+    \sa drawForeground(), QGraphicsScene::drawBackground()
+*/
+void QGraphicsView::drawBackground(QPainter *painter, const QRectF &rect)
+{
+    Q_D(QGraphicsView);
+    if (d->scene && d->backgroundBrush.style() == Qt::NoBrush) {
+        d->scene->drawBackground(painter, rect);
+        return;
+    }
+
+    painter->fillRect(rect, d->backgroundBrush);
+}
+
+/*!
+    Draws the foreground of the scene using \a painter, after the background
+    and all items are drawn. Reimplement this function to provide a custom
+    foreground for this view.
+
+    If all you want is to define a color, texture or gradient for the
+    foreground, you can call setForegroundBrush() instead.
+
+    All painting is done in \e scene coordinates. \a rect is the exposed
+    rectangle.
+
+    The default implementation fills \a rect using the view's foregroundBrush.
+    If no such brush is defined (the default), the scene's drawForeground()
+    function is called instead.
+
+    \sa drawBackground(), QGraphicsScene::drawForeground()
+*/
+void QGraphicsView::drawForeground(QPainter *painter, const QRectF &rect)
+{
+    Q_D(QGraphicsView);
+    if (d->scene && d->foregroundBrush.style() == Qt::NoBrush) {
+        d->scene->drawForeground(painter, rect);
+        return;
+    }
+
+    painter->fillRect(rect, d->foregroundBrush);
+}
+
+/*!
+    Draws the items \a items in the scene using \a painter, after the
+    background and before the foreground are drawn. \a numItems is the number
+    of items in \a items and options in \a options. \a options is a list of
+    styleoptions; one for each item. Reimplement this function to provide
+    custom item drawing for this view.
+
+    The default implementation calls the scene's drawItems() function.
+
+    \sa drawForeground(), drawBackground(), QGraphicsScene::drawItems()
+*/
+void QGraphicsView::drawItems(QPainter *painter, int numItems,
+                              QGraphicsItem *items[],
+                              const QStyleOptionGraphicsItem options[])
+{
+    Q_D(QGraphicsView);
+    if (d->scene)
+        d->scene->drawItems(painter, numItems, items, options, viewport());
+}
+
+/*!
+    Returns the current transformation matrix for the view. If no current
+    transformation is set, the identity matrix is returned.
+
+    \sa setTransform(), rotate(), scale(), shear(), translate()
+*/
+QTransform QGraphicsView::transform() const
+{
+    Q_D(const QGraphicsView);
+    return d->matrix;
+}
+
+/*!
+    Returns a matrix that maps viewport coordinates to scene coordinates.
+
+    \sa mapToScene(), mapFromScene()
+*/
+QTransform QGraphicsView::viewportTransform() const
+{
+    Q_D(const QGraphicsView);
+    QTransform moveMatrix;
+    moveMatrix.translate(-d->horizontalScroll(), -d->verticalScroll());
+    return d->identityMatrix ? moveMatrix : d->matrix * moveMatrix;
+}
+
+/*!
+    Sets the view's current transformation matrix to \a matrix.
+
+    If \a combine is true, then \a matrix is combined with the current matrix;
+    otherwise, \a matrix \e replaces the current matrix. \a combine is false
+    by default.
+
+    The transformation matrix tranforms the scene into view coordinates. Using
+    the default transformation, provided by the identity matrix, one pixel in
+    the view represents one unit in the scene (e.g., a 10x10 rectangular item
+    is drawn using 10x10 pixels in the view). If a 2x2 scaling matrix is
+    applied, the scene will be drawn in 1:2 (e.g., a 10x10 rectangular item is
+    then drawn using 20x20 pixels in the view).
+
+    Example:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicsview.cpp 7
+
+    To simplify interation with items using a transformed view, QGraphicsView
+    provides mapTo... and mapFrom... functions that can translate between
+    scene and view coordinates. For example, you can call mapToScene() to map
+    a view coordiate to a floating point scene coordinate, or mapFromScene()
+    to map from floating point scene coordinates to view coordinates.
+
+    \sa transform(), rotate(), scale(), shear(), translate()
+*/
+void QGraphicsView::setTransform(const QTransform &matrix, bool combine )
+{
+    Q_D(QGraphicsView);
+    QTransform oldMatrix = d->matrix;
+    if (!combine)
+        d->matrix = matrix;
+    else
+        d->matrix = matrix * d->matrix;
+    if (oldMatrix == d->matrix)
+        return;
+
+    d->identityMatrix = d->matrix.isIdentity();
+    d->transforming = true;
+    if (d->scene) {
+        d->recalculateContentSize();
+        d->centerView(d->transformationAnchor);
+    } else {
+        d->updateLastCenterPoint();
+    }
+
+    if (d->sceneInteractionAllowed)
+        d->replayLastMouseEvent();
+    d->transforming = false;
+
+    // Any matrix operation requires a full update.
+    viewport()->update();
+}
+
+/*!
+    Resets the view transformation to the identity matrix.
+
+    \sa transform(), setTransform()
+*/
+void QGraphicsView::resetTransform()
+{
+    setTransform(QTransform());
+}
+
+QT_END_NAMESPACE
+
+#include "moc_qgraphicsview.cpp"
+
+#endif // QT_NO_GRAPHICSVIEW
diff --git a/src/gui/graphicsview/qgraphicsview.h b/src/gui/graphicsview/qgraphicsview.h
new file mode 100644
index 0000000..e77e45c
--- /dev/null
+++ b/src/gui/graphicsview/qgraphicsview.h
@@ -0,0 +1,314 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QGRAPHICSVIEW_H
+#define QGRAPHICSVIEW_H
+
+#include <QtCore/qmetatype.h>
+#include <QtGui/qpainter.h>
+#include <QtGui/qscrollarea.h>
+#include <QtGui/qgraphicsscene.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Gui)
+
+#if !defined(QT_NO_GRAPHICSVIEW) || (QT_EDITION & QT_MODULE_GRAPHICSVIEW) != QT_MODULE_GRAPHICSVIEW
+
+class QGraphicsItem;
+class QPainterPath;
+class QPolygonF;
+class QStyleOptionGraphicsItem;
+
+class QGraphicsViewPrivate;
+class Q_GUI_EXPORT QGraphicsView : public QAbstractScrollArea
+{
+    Q_OBJECT
+    Q_FLAGS(QPainter::RenderHints CacheMode OptimizationFlags)
+    Q_ENUMS(ViewportAnchor DragMode ViewportUpdateMode)
+    Q_PROPERTY(QBrush backgroundBrush READ backgroundBrush WRITE setBackgroundBrush)
+    Q_PROPERTY(QBrush foregroundBrush READ foregroundBrush WRITE setForegroundBrush)
+    Q_PROPERTY(bool interactive READ isInteractive WRITE setInteractive)
+    Q_PROPERTY(QRectF sceneRect READ sceneRect WRITE setSceneRect)
+    Q_PROPERTY(Qt::Alignment alignment READ alignment WRITE setAlignment)
+    Q_PROPERTY(QPainter::RenderHints renderHints READ renderHints WRITE setRenderHints)
+    Q_PROPERTY(DragMode dragMode READ dragMode WRITE setDragMode)
+    Q_PROPERTY(CacheMode cacheMode READ cacheMode WRITE setCacheMode)
+    Q_PROPERTY(ViewportAnchor transformationAnchor READ transformationAnchor WRITE setTransformationAnchor)
+    Q_PROPERTY(ViewportAnchor resizeAnchor READ resizeAnchor WRITE setResizeAnchor)
+    Q_PROPERTY(ViewportUpdateMode viewportUpdateMode READ viewportUpdateMode WRITE setViewportUpdateMode)
+#ifndef QT_NO_RUBBERBAND
+    Q_PROPERTY(Qt::ItemSelectionMode rubberBandSelectionMode READ rubberBandSelectionMode WRITE setRubberBandSelectionMode)
+#endif
+    Q_PROPERTY(OptimizationFlags optimizationFlags READ optimizationFlags WRITE setOptimizationFlags)
+
+public:
+    enum ViewportAnchor {
+        NoAnchor,
+        AnchorViewCenter,
+        AnchorUnderMouse
+    };
+
+    enum CacheModeFlag {
+        CacheNone = 0x0,
+        CacheBackground = 0x1
+    };
+    Q_DECLARE_FLAGS(CacheMode, CacheModeFlag)
+
+    enum DragMode {
+        NoDrag,
+        ScrollHandDrag,
+        RubberBandDrag
+    };
+
+    enum ViewportUpdateMode {
+        FullViewportUpdate,
+        MinimalViewportUpdate,
+        SmartViewportUpdate,
+        NoViewportUpdate,
+        BoundingRectViewportUpdate
+    };
+
+    enum OptimizationFlag {
+        DontClipPainter = 0x1,
+        DontSavePainterState = 0x2,
+        DontAdjustForAntialiasing = 0x4
+    };
+    Q_DECLARE_FLAGS(OptimizationFlags, OptimizationFlag)
+
+    QGraphicsView(QWidget *parent = 0);
+    QGraphicsView(QGraphicsScene *scene, QWidget *parent = 0);
+    ~QGraphicsView();
+
+    QSize sizeHint() const;
+
+    QPainter::RenderHints renderHints() const;
+    void setRenderHint(QPainter::RenderHint hint, bool enabled = true);
+    void setRenderHints(QPainter::RenderHints hints);
+
+    Qt::Alignment alignment() const;
+    void setAlignment(Qt::Alignment alignment);
+
+    ViewportAnchor transformationAnchor() const;
+    void setTransformationAnchor(ViewportAnchor anchor);
+
+    ViewportAnchor resizeAnchor() const;
+    void setResizeAnchor(ViewportAnchor anchor);
+
+    ViewportUpdateMode viewportUpdateMode() const;
+    void setViewportUpdateMode(ViewportUpdateMode mode);
+
+    OptimizationFlags optimizationFlags() const;
+    void setOptimizationFlag(OptimizationFlag flag, bool enabled = true);
+    void setOptimizationFlags(OptimizationFlags flags);
+
+    DragMode dragMode() const;
+    void setDragMode(DragMode mode);
+
+#ifndef QT_NO_RUBBERBAND
+    Qt::ItemSelectionMode rubberBandSelectionMode() const;
+    void setRubberBandSelectionMode(Qt::ItemSelectionMode mode);
+#endif
+
+    CacheMode cacheMode() const;
+    void setCacheMode(CacheMode mode);
+    void resetCachedContent();
+
+    bool isInteractive() const;
+    void setInteractive(bool allowed);
+
+    QGraphicsScene *scene() const;
+    void setScene(QGraphicsScene *scene);
+
+    QRectF sceneRect() const;
+    void setSceneRect(const QRectF &rect);
+    inline void setSceneRect(qreal x, qreal y, qreal w, qreal h);
+
+    QMatrix matrix() const;
+    void setMatrix(const QMatrix &matrix, bool combine = false);
+    void resetMatrix();
+    QTransform transform() const;
+    QTransform viewportTransform() const;
+    void setTransform(const QTransform &matrix, bool combine = false);
+    void resetTransform();
+    void rotate(qreal angle);
+    void scale(qreal sx, qreal sy);
+    void shear(qreal sh, qreal sv);
+    void translate(qreal dx, qreal dy);
+
+    void centerOn(const QPointF &pos);
+    inline void centerOn(qreal x, qreal y);
+    void centerOn(const QGraphicsItem *item);
+    void ensureVisible(const QRectF &rect, int xmargin = 50, int ymargin = 50);
+    inline void ensureVisible(qreal x, qreal y, qreal w, qreal h, int xmargin = 50, int ymargin = 50);
+    void ensureVisible(const QGraphicsItem *item, int xmargin = 50, int ymargin = 50);
+    void fitInView(const QRectF &rect, Qt::AspectRatioMode aspectRadioMode = Qt::IgnoreAspectRatio);
+    inline void fitInView(qreal x, qreal y, qreal w, qreal h,
+                          Qt::AspectRatioMode aspectRadioMode = Qt::IgnoreAspectRatio);
+    void fitInView(const QGraphicsItem *item,
+                   Qt::AspectRatioMode aspectRadioMode = Qt::IgnoreAspectRatio);
+
+    void render(QPainter *painter, const QRectF &target = QRectF(), const QRect &source = QRect(),
+                Qt::AspectRatioMode aspectRatioMode = Qt::KeepAspectRatio);
+
+    QList<QGraphicsItem *> items() const;
+    QList<QGraphicsItem *> items(const QPoint &pos) const;
+    inline QList<QGraphicsItem *> items(int x, int y) const;
+    QList<QGraphicsItem *> items(const QRect &rect, Qt::ItemSelectionMode mode = Qt::IntersectsItemShape) const;
+    inline QList<QGraphicsItem *> items(int x, int y, int w, int h, Qt::ItemSelectionMode mode = Qt::IntersectsItemShape) const;
+    QList<QGraphicsItem *> items(const QPolygon &polygon, Qt::ItemSelectionMode mode = Qt::IntersectsItemShape) const;
+    QList<QGraphicsItem *> items(const QPainterPath &path, Qt::ItemSelectionMode mode = Qt::IntersectsItemShape) const;
+    QGraphicsItem *itemAt(const QPoint &pos) const;
+    inline QGraphicsItem *itemAt(int x, int y) const;
+
+    QPointF mapToScene(const QPoint &point) const;
+    QPolygonF mapToScene(const QRect &rect) const;
+    QPolygonF mapToScene(const QPolygon &polygon) const;
+    QPainterPath mapToScene(const QPainterPath &path) const;
+    QPoint mapFromScene(const QPointF &point) const;
+    QPolygon mapFromScene(const QRectF &rect) const;
+    QPolygon mapFromScene(const QPolygonF &polygon) const;
+    QPainterPath mapFromScene(const QPainterPath &path) const;
+    inline QPointF mapToScene(int x, int y) const;
+    inline QPolygonF mapToScene(int x, int y, int w, int h) const;
+    inline QPoint mapFromScene(qreal x, qreal y) const;
+    inline QPolygon mapFromScene(qreal x, qreal y, qreal w, qreal h) const;
+
+    QVariant inputMethodQuery(Qt::InputMethodQuery query) const;
+
+    QBrush backgroundBrush() const;
+    void setBackgroundBrush(const QBrush &brush);
+
+    QBrush foregroundBrush() const;
+    void setForegroundBrush(const QBrush &brush);
+
+public Q_SLOTS:
+    void updateScene(const QList<QRectF> &rects);
+    void invalidateScene(const QRectF &rect = QRectF(), QGraphicsScene::SceneLayers layers = QGraphicsScene::AllLayers);
+    void updateSceneRect(const QRectF &rect);
+
+protected Q_SLOTS:
+    void setupViewport(QWidget *widget);
+
+protected:
+    QGraphicsView(QGraphicsViewPrivate &, QWidget *parent = 0);
+    bool event(QEvent *event);
+    bool viewportEvent(QEvent *event);
+
+#ifndef QT_NO_CONTEXTMENU
+    void contextMenuEvent(QContextMenuEvent *event);
+#endif
+    void dragEnterEvent(QDragEnterEvent *event);
+    void dragLeaveEvent(QDragLeaveEvent *event);
+    void dragMoveEvent(QDragMoveEvent *event);
+    void dropEvent(QDropEvent *event);
+    void focusInEvent(QFocusEvent *event);
+    bool focusNextPrevChild(bool next);
+    void focusOutEvent(QFocusEvent *event);
+    void keyPressEvent(QKeyEvent *event);
+    void keyReleaseEvent(QKeyEvent *event);
+    void mouseDoubleClickEvent(QMouseEvent *event);
+    void mousePressEvent(QMouseEvent *event);
+    void mouseMoveEvent(QMouseEvent *event);
+    void mouseReleaseEvent(QMouseEvent *event);
+#ifndef QT_NO_WHEELEVENT
+    void wheelEvent(QWheelEvent *event);
+#endif
+    void paintEvent(QPaintEvent *event);
+    void resizeEvent(QResizeEvent *event);
+    void scrollContentsBy(int dx, int dy);
+    void showEvent(QShowEvent *event);
+    void inputMethodEvent(QInputMethodEvent *event);
+
+    virtual void drawBackground(QPainter *painter, const QRectF &rect);
+    virtual void drawForeground(QPainter *painter, const QRectF &rect);
+    virtual void drawItems(QPainter *painter, int numItems,
+                           QGraphicsItem *items[],
+                           const QStyleOptionGraphicsItem options[]);
+
+private:
+    Q_DECLARE_PRIVATE(QGraphicsView)
+    Q_DISABLE_COPY(QGraphicsView)
+#ifndef QT_NO_CURSOR
+    Q_PRIVATE_SLOT(d_func(), void _q_setViewportCursor(const QCursor &))
+    Q_PRIVATE_SLOT(d_func(), void _q_unsetViewportCursor())
+#endif
+    Q_PRIVATE_SLOT(d_func(), void _q_updateLaterSlot())
+    friend class QGraphicsSceneWidget;
+    friend class QGraphicsScene;
+    friend class QGraphicsScenePrivate;
+};
+
+Q_DECLARE_OPERATORS_FOR_FLAGS(QGraphicsView::CacheMode)
+Q_DECLARE_OPERATORS_FOR_FLAGS(QGraphicsView::OptimizationFlags)
+
+inline void QGraphicsView::setSceneRect(qreal ax, qreal ay, qreal aw, qreal ah)
+{ setSceneRect(QRectF(ax, ay, aw, ah)); }
+inline void QGraphicsView::centerOn(qreal ax, qreal ay)
+{ centerOn(QPointF(ax, ay)); }
+inline void QGraphicsView::ensureVisible(qreal ax, qreal ay, qreal aw, qreal ah, int xmargin, int ymargin)
+{ ensureVisible(QRectF(ax, ay, aw, ah), xmargin, ymargin); }
+inline void QGraphicsView::fitInView(qreal ax, qreal ay, qreal w, qreal h, Qt::AspectRatioMode mode)
+{ fitInView(QRectF(ax, ay, w, h), mode); }
+inline QList<QGraphicsItem *> QGraphicsView::items(int ax, int ay) const
+{ return items(QPoint(ax, ay)); }
+inline QList<QGraphicsItem *> QGraphicsView::items(int ax, int ay, int w, int h, Qt::ItemSelectionMode mode) const
+{ return items(QRect(ax, ay, w, h), mode); }
+inline QGraphicsItem *QGraphicsView::itemAt(int ax, int ay) const
+{ return itemAt(QPoint(ax, ay)); }
+inline QPointF QGraphicsView::mapToScene(int ax, int ay) const
+{ return mapToScene(QPoint(ax, ay)); }
+inline QPolygonF QGraphicsView::mapToScene(int ax, int ay, int w, int h) const
+{ return mapToScene(QRect(ax, ay, w, h)); }
+inline QPoint QGraphicsView::mapFromScene(qreal ax, qreal ay) const
+{ return mapFromScene(QPointF(ax, ay)); }
+inline QPolygon QGraphicsView::mapFromScene(qreal ax, qreal ay, qreal w, qreal h) const
+{ return mapFromScene(QRectF(ax, ay, w, h)); }
+
+#endif // QT_NO_GRAPHICSVIEW
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QGRAPHICSVIEW_H
diff --git a/src/gui/graphicsview/qgraphicsview_p.h b/src/gui/graphicsview/qgraphicsview_p.h
new file mode 100644
index 0000000..2109673
--- /dev/null
+++ b/src/gui/graphicsview/qgraphicsview_p.h
@@ -0,0 +1,191 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QGRAPHICSVIEW_P_H
+#define QGRAPHICSVIEW_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of qapplication_*.cpp, qwidget*.cpp and qfiledialog.cpp.  This header
+// file may change from version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "qgraphicsview.h"
+
+#if !defined(QT_NO_GRAPHICSVIEW) || (QT_EDITION & QT_MODULE_GRAPHICSVIEW) != QT_MODULE_GRAPHICSVIEW
+
+#include <QtGui/qevent.h>
+#include "qgraphicssceneevent.h"
+#include <private/qabstractscrollarea_p.h>
+
+QT_BEGIN_NAMESPACE
+
+class Q_GUI_EXPORT QGraphicsViewPrivate : public QAbstractScrollAreaPrivate
+{
+    Q_DECLARE_PUBLIC(QGraphicsView)
+public:
+    QGraphicsViewPrivate();
+
+    void recalculateContentSize();
+    void centerView(QGraphicsView::ViewportAnchor anchor);
+
+    QPainter::RenderHints renderHints;
+
+    QGraphicsView::DragMode dragMode;
+    bool sceneInteractionAllowed;
+    QRectF sceneRect;
+    bool hasSceneRect;
+    void updateLastCenterPoint();
+    bool connectedToScene;
+
+    qint64 horizontalScroll() const;
+    qint64 verticalScroll() const;
+
+    QList<QGraphicsItem *> itemsInArea(const QPainterPath &path,
+                                       Qt::ItemSelectionMode mode = Qt::IntersectsItemShape) const;
+
+    QPointF mousePressItemPoint;
+    QPointF mousePressScenePoint;
+    QPoint mousePressViewPoint;
+    QPoint mousePressScreenPoint;
+    QPointF lastMouseMoveScenePoint;
+    QPoint lastMouseMoveScreenPoint;
+    Qt::MouseButton mousePressButton;
+    QTransform matrix;
+    bool identityMatrix;
+    qint64 scrollX, scrollY;
+    bool dirtyScroll;
+    void updateScroll();
+
+    bool accelerateScrolling;
+    qreal leftIndent;
+    qreal topIndent;
+
+    // Replaying mouse events
+    QMouseEvent lastMouseEvent;
+    bool useLastMouseEvent;
+    void replayLastMouseEvent();
+    void storeMouseEvent(QMouseEvent *event);
+    void mouseMoveEventHandler(QMouseEvent *event);
+
+    QPointF lastCenterPoint;
+    bool keepLastCenterPoint;
+    Qt::Alignment alignment;
+    bool transforming;
+
+    QGraphicsView::ViewportAnchor transformationAnchor;
+    QGraphicsView::ViewportAnchor resizeAnchor;
+    QGraphicsView::ViewportUpdateMode viewportUpdateMode;
+    QGraphicsView::OptimizationFlags optimizationFlags;
+
+    QPointer<QGraphicsScene> scene;
+#ifndef QT_NO_RUBBERBAND
+    QRect rubberBandRect;
+    QRegion rubberBandRegion(const QWidget *widget, const QRect &rect) const;
+    bool rubberBanding;
+    Qt::ItemSelectionMode rubberBandSelectionMode;
+#endif
+    bool handScrolling;
+    int handScrollMotions;
+
+    QGraphicsView::CacheMode cacheMode;
+
+    QVector<QStyleOptionGraphicsItem> styleOptions;
+    bool mustAllocateStyleOptions;
+    QStyleOptionGraphicsItem *allocStyleOptionsArray(int numItems);
+    void freeStyleOptionsArray(QStyleOptionGraphicsItem *array);
+
+    QBrush backgroundBrush;
+    QBrush foregroundBrush;
+    QPixmap backgroundPixmap;
+    bool mustResizeBackgroundPixmap;
+    QRegion backgroundPixmapExposed;
+
+#ifndef QT_NO_CURSOR
+    QCursor originalCursor;
+    bool hasStoredOriginalCursor;
+    void _q_setViewportCursor(const QCursor &cursor);
+    void _q_unsetViewportCursor();
+#endif
+
+    QGraphicsSceneDragDropEvent *lastDragDropEvent;
+    void storeDragDropEvent(const QGraphicsSceneDragDropEvent *event);
+    void populateSceneDragDropEvent(QGraphicsSceneDragDropEvent *dest,
+                                    QDropEvent *source);
+
+    QRect mapToViewRect(const QGraphicsItem *item, const QRectF &rect) const;
+    QRegion mapToViewRegion(const QGraphicsItem *item, const QRectF &rect) const;
+    void itemUpdated(QGraphicsItem *item, const QRectF &rect);
+    bool fullUpdatePending;
+    QList<QRect> dirtyRects;
+    QList<QRegion> dirtyRegions;
+    int dirtyRectCount;
+    QRect dirtyBoundingRect;
+    void updateLater();
+    bool updatingLater;
+    void _q_updateLaterSlot();
+    void updateAll();
+    void updateRect(const QRect &rect);
+    void updateRegion(const QRegion &region);
+    bool updateSceneSlotReimplementedChecked;
+
+    QList<QGraphicsItem *> findItems(const QRegion &exposedRegion,
+				     const QTransform &worldTransform,
+                                     bool *allItems) const;
+
+    void generateStyleOptions(const QList<QGraphicsItem *> &itemList,
+			      QGraphicsItem **itemArray,
+			      QStyleOptionGraphicsItem *styleOptionArray,
+			      const QTransform &worldTransform,
+			      bool allItems,
+			      const QRegion &exposedRegion) const;
+};
+
+QT_END_NAMESPACE
+
+#endif // QT_NO_GRAPHICSVIEW
+
+#endif
diff --git a/src/gui/graphicsview/qgraphicswidget.cpp b/src/gui/graphicsview/qgraphicswidget.cpp
new file mode 100644
index 0000000..5cc18f9
--- /dev/null
+++ b/src/gui/graphicsview/qgraphicswidget.cpp
@@ -0,0 +1,2273 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qglobal.h"
+
+#ifndef QT_NO_GRAPHICSVIEW
+
+#include "qgraphicswidget.h"
+#include "qgraphicswidget_p.h"
+#include "qgraphicslayout.h"
+#include "qgraphicslayout_p.h"
+#include "qgraphicsscene.h"
+#include "qgraphicssceneevent.h"
+
+#ifndef QT_NO_ACTION
+#include <private/qaction_p.h>
+#endif
+#include <private/qapplication_p.h>
+#include <private/qgraphicsscene_p.h>
+#ifndef QT_NO_SHORTCUT
+#include <private/qshortcutmap_p.h>
+#endif
+#include <QtCore/qmutex.h>
+#include <QtGui/qapplication.h>
+#include <QtGui/qgraphicsview.h>
+#include <QtGui/qgraphicsproxywidget.h>
+#include <QtGui/qpalette.h>
+#include <QtGui/qstyleoption.h>
+
+#include <qdebug.h>
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    \class QGraphicsWidget
+    \brief The QGraphicsWidget class is the base class for all widget
+    items in a QGraphicsScene.
+    \since 4.4
+    \ingroup multimedia
+    \ingroup graphicsview-api
+
+    QGraphicsWidget is an extended base item that provides extra functionality
+    over QGraphicsItem. It is similar to QWidget in many ways:
+
+    \list
+        \o Provides a \l palette, a \l font and a \l style().
+        \o Has a defined geometry().
+        \o Supports layouts with setLayout() and layout().
+        \o Supports shortcuts and actions with grabShortcut() and insertAction()
+    \endlist
+
+    Unlike QGraphicsItem, QGraphicsWidget is not an abstract class; you can
+    create instances of a QGraphicsWidget without having to subclass it.
+    This approach is useful for widgets that only serve the purpose of
+    organizing child widgets into a layout.
+
+    QGraphicsWidget can be used as a base item for your own custom item if
+    you require advanced input focus handling, e.g., tab focus and activation, or
+    layouts.
+
+    Since QGraphicsWidget resembles QWidget and has similar API, it is
+    easier to port a widget from QWidget to QGraphicsWidget, instead of
+    QGraphicsItem.
+
+    \note QWidget-based widgets can be directly embedded into a
+    QGraphicsScene using QGraphicsProxyWidget.
+
+    Noticeable differences between QGraphicsWidget and QWidget are:
+
+    \table
+    \header \o QGraphicsWidget
+                \o QWidget
+    \row      \o Coordinates and geometry are defined with qreals (doubles or
+                    floats, depending on the platform).
+                \o QWidget uses integer geometry (QPoint, QRect).
+    \row      \o The widget is already visible by default; you do not have to
+                    call show() to display the widget.
+                \o QWidget is hidden by default until you call show().
+    \row      \o A subset of widget attributes are supported.
+                \o All widget attributes are supported.
+    \row      \o A top-level item's style defaults to QGraphicsScene::style
+                \o A top-level widget's style defaults to QApplication::style
+    \row      \o Graphics View provides a custom drag and drop framework, different
+                    from QWidget.
+                \o Standard drag and drop framework.
+    \row      \o Widget items do not support modality.
+                \o Full modality support.
+    \endtable
+
+    QGraphicsWidget supports a subset of Qt's widget attributes,
+    (Qt::WidgetAttribute), as shown in the table below. Any attributes not
+    listed in this table are unsupported, or otherwise unused.
+
+    \table
+    \header \o Widget Attribute                         \o Usage
+    \row    \o Qt::WA_SetLayoutDirection
+                    \o Set by setLayoutDirection(), cleared by
+                        unsetLayoutDirection(). You can test this attribute to
+                        check if the widget has been explicitly assigned a
+                        \l{QGraphicsWidget::layoutDirection()}
+                        {layoutDirection}. If the attribute is not set, the
+                        \l{QGraphicsWidget::layoutDirection()}
+                        {layoutDirection()} is inherited.
+    \row    \o Qt::WA_RightToLeft
+                    \o Toggled by setLayoutDirection(). Inherited from the
+                        parent/scene. If set, the widget's layout will order
+                        horizontally arranged widgets from right to left.
+    \row    \o Qt::WA_SetStyle
+                    \o Set and cleared by setStyle(). If this attribute is
+                        set, the widget has been explicitly assigned a style.
+                        If it is unset, the widget will use the scene's or the
+                        application's style.
+    \row    \o Qt::WA_Resized
+                    \o Set by setGeometry() and resize().
+    \row    \o Qt::WA_SetPalette
+                    \o Set by setPalette().
+    \row    \o Qt::WA_SetFont
+                    \o Set by setPalette().
+    \row    \o Qt::WA_WindowPropagation
+                    \o Enables propagation to window widgets.
+    \endtable
+
+    Although QGraphicsWidget inherits from both QObject and QGraphicsItem,
+    you should use the functions provided by QGraphicsItem, \e not QObject, to
+    manage the relationships between parent and child items. These functions
+    control the stacking order of items as well as their ownership.
+
+    \note The QObject::parent() should always return 0 for QGraphicsWidgets,
+    but this policy is not strictly defined.
+
+    \sa QGraphicsProxyWidget, QGraphicsItem, {Widgets and Layouts}
+*/
+
+/*!
+    \property QGraphicsWidget::enabled
+    \brief whether the item is enabled or not
+
+    This property is declared in QGraphicsItem.
+
+    By default, this property is true.
+
+    \sa QGraphicsItem::isEnabled(), QGraphicsItem::setEnabled()
+*/
+
+/*!
+    \property QGraphicsWidget::visible
+    \brief whether the item is visible or not
+
+    This property is declared in QGraphicsItem.
+
+    By default, this property is true.
+
+    \sa QGraphicsItem::isVisible(), QGraphicsItem::setVisible(), show(),
+    hide()
+*/
+
+/*!
+    \property QGraphicsWidget::opacity
+    \brief the opacity of the widget
+*/    
+
+/*!
+    \property QGraphicsWidget::pos
+    \brief the position of the widget
+*/    
+
+/*!
+    Constructs a QGraphicsWidget instance. The optional \a parent argument is
+    passed to QGraphicsItem's constructor. The optional \a wFlags argument
+    specifies the widget's window flags (e.g., whether the widget should be a
+    window, a tool, a popup, etc).
+*/
+QGraphicsWidget::QGraphicsWidget(QGraphicsItem *parent, Qt::WindowFlags wFlags)
+    : QGraphicsItem(*new QGraphicsWidgetPrivate, 0, 0), QGraphicsLayoutItem(0, false)
+{
+    Q_D(QGraphicsWidget);
+    d->init(parent, wFlags);
+}
+
+/*!
+    \internal
+
+    Constructs a new QGraphicsWidget, using \a dd as parent.
+*/
+QGraphicsWidget::QGraphicsWidget(QGraphicsWidgetPrivate &dd, QGraphicsItem *parent, QGraphicsScene *scene, Qt::WindowFlags wFlags)
+    : QGraphicsItem(dd, 0, scene), QGraphicsLayoutItem(0, false)
+{
+    Q_D(QGraphicsWidget);
+    d->init(parent, wFlags);
+}
+
+/*
+    \internal
+    \class QGraphicsWidgetStyles
+
+    We use this thread-safe class to maintain a hash of styles for widgets
+    styles. Note that QApplication::style() itself isn't thread-safe, QStyle
+    isn't thread-safe, and we don't have a thread-safe factory for creating
+    the default style, nor cloning a style.
+*/
+class QGraphicsWidgetStyles
+{
+public:
+    QStyle *styleForWidget(const QGraphicsWidget *widget) const
+    {
+        QMutexLocker locker(&mutex);
+        return styles.value(widget, 0);
+    }
+
+    void setStyleForWidget(QGraphicsWidget *widget, QStyle *style)
+    {
+        QMutexLocker locker(&mutex);
+        if (style)
+            styles[widget] = style;
+        else
+            styles.remove(widget);
+    }
+
+private:
+    QMap<const QGraphicsWidget *, QStyle *> styles;
+    mutable QMutex mutex;
+};
+Q_GLOBAL_STATIC(QGraphicsWidgetStyles, widgetStyles)
+
+/*!
+    Destroys the QGraphicsWidget instance.
+*/
+QGraphicsWidget::~QGraphicsWidget()
+{
+    Q_D(QGraphicsWidget);
+#ifndef QT_NO_ACTION
+    // Remove all actions from this widget
+    for (int i = 0; i < d->actions.size(); ++i) {
+        QActionPrivate *apriv = d->actions.at(i)->d_func();
+        apriv->graphicsWidgets.removeAll(this);
+    }
+    d->actions.clear();
+#endif
+
+    if (QGraphicsScene *scn = scene()) {
+        QGraphicsScenePrivate *sceneD = scn->d_func();
+        if (sceneD->tabFocusFirst == this)
+            sceneD->tabFocusFirst = (d->focusNext == this ? 0 : d->focusNext);
+    }
+    d->focusPrev->d_func()->focusNext = d->focusNext;
+    d->focusNext->d_func()->focusPrev = d->focusPrev;
+
+    // Play it really safe
+    d->focusNext = this;
+    d->focusPrev = this;
+
+    clearFocus();
+
+    //we check if we have a layout previously
+    if (d->layout) {
+        delete d->layout;
+        foreach (QGraphicsItem * item, childItems()) {
+            // In case of a custom layout which doesn't remove and delete items, we ensure that
+            // the parent layout item does not point to the deleted layout. This code is here to
+            // avoid regression from 4.4 to 4.5, because according to 4.5 docs it is not really needed.
+            if (item->isWidget()) {
+                QGraphicsWidget *widget = static_cast<QGraphicsWidget *>(item);
+                if (widget->parentLayoutItem() == d->layout)
+                    widget->setParentLayoutItem(0);
+            }
+        }
+    }
+
+    // Remove this graphics widget from widgetStyles
+    widgetStyles()->setStyleForWidget(this, 0);
+}
+
+/*!
+    \property QGraphicsWidget::size
+    \brief the size of the widget
+
+    Calling resize() resizes the widget to a \a size bounded by minimumSize()
+    and maximumSize(). This property only affects the widget's width and
+    height (e.g., its right and bottom edges); the widget's position and
+    top-left corner remains unaffected.
+
+    Resizing a widget triggers the widget to immediately receive a
+    \l{QEvent::GraphicsSceneResize}{GraphicsSceneResize} event with the
+    widget's old and new size.  If the widget has a layout assigned when this
+    event arrives, the layout will be activated and it will automatically
+    update any child widgets's geometry.
+
+    This property does not affect any layout of the parent widget. If the
+    widget itself is managed by a parent layout; e.g., it has a parent widget
+    with a layout assigned, that layout will not activate.
+
+    By default, this property contains a size with zero width and height.
+
+    \sa setGeometry(), QGraphicsSceneResizeEvent, QGraphicsLayout
+*/
+QSizeF QGraphicsWidget::size() const
+{
+    return QGraphicsLayoutItem::geometry().size();
+}
+
+void QGraphicsWidget::resize(const QSizeF &size)
+{
+    setGeometry(QRectF(pos(), size));
+}
+
+/*!
+    \fn void QGraphicsWidget::resize(qreal w, qreal h)
+
+    This convenience function is equivalent to calling resize(QSizeF(w, h)).
+
+    \sa setGeometry(), setTransform()
+*/
+
+/*!
+    \property QGraphicsWidget::geometry
+    \brief the geometry of the widget
+
+    Sets the item's geometry to \a rect. The item's position and size are
+    modified as a result of calling this function. The item is first moved,
+    then resized.
+
+    A side effect of calling this function is that the widget will receive
+    a move event and a resize event. Also, if the widget has a layout
+    assigned, the layout will activate.
+    
+    \sa geometry(), resize()
+*/
+void QGraphicsWidget::setGeometry(const QRectF &rect)
+{
+    QGraphicsWidgetPrivate *wd = QGraphicsWidget::d_func();
+    const QGraphicsLayoutItemPrivate *d = QGraphicsLayoutItem::d_ptr;
+    setAttribute(Qt::WA_Resized);
+    QRectF newGeom = rect;
+    newGeom.setSize(rect.size().expandedTo(effectiveSizeHint(Qt::MinimumSize))
+                               .boundedTo(effectiveSizeHint(Qt::MaximumSize)));
+    if (newGeom == d->geom)
+        return;
+
+    // Update and prepare to change the geometry (remove from index).
+    if (wd->scene) {
+        if (rect.topLeft() != d->geom.topLeft())
+            wd->fullUpdateHelper(true);
+        else
+            update();
+    }
+    prepareGeometryChange();
+
+    // setPos triggers ItemPositionChange, which can adjust position
+    QPointF oldPos = d->geom.topLeft();
+    wd->inSetGeometry = 1;
+    wd->setPosHelper(newGeom.topLeft(), /* update = */ false);
+    wd->inSetGeometry = 0;
+    newGeom.moveTopLeft(pos());
+
+    if (newGeom == d->geom)
+        return;
+
+    // Update the layout item geometry
+    bool moved = oldPos != pos();
+    if (moved) {
+        // Send move event.
+        QGraphicsSceneMoveEvent event;
+        event.setOldPos(oldPos);
+        event.setNewPos(pos());
+        QApplication::sendEvent(this, &event);
+    }
+    QSizeF oldSize = size();
+    QGraphicsLayoutItem::setGeometry(newGeom);
+
+    // Send resize event
+    bool resized = newGeom.size() != oldSize;
+    if (resized) {
+        QGraphicsSceneResizeEvent re;
+        re.setOldSize(oldSize);
+        re.setNewSize(newGeom.size());
+        QApplication::sendEvent(this, &re);
+    }
+}
+
+/*!
+    \fn QRectF QGraphicsWidget::rect() const
+
+    Returns the item's local rect as a QRectF. This function is equivalent
+    to QRectF(QPointF(), size()).
+
+    \sa setGeometry(), resize()
+*/
+
+/*!
+    \fn void QGraphicsWidget::setGeometry(qreal x, qreal y, qreal w, qreal h)
+
+    This convenience function is equivalent to calling setGeometry(QRectF(
+    \a x, \a y, \a w, \a h)).
+
+    \sa geometry(), resize()
+*/
+
+/*!
+    Sets the widget's contents margins to \a left, \a top, \a right and \a
+    bottom.
+
+    Contents margins are used by the assigned layout to define the placement
+    of subwidgets and layouts. Margins are particularily useful for widgets
+    that constrain subwidgets to only a section of its own geometry. For
+    example, a group box with a layout will place subwidgets inside its frame,
+    but below the title.
+
+    Changing a widget's contents margins will always trigger an update(), and
+    any assigned layout will be activated automatically. The widget will then
+    receive a \l{QEvent::ContentsRectChange}{ContentsRectChange} event.
+
+    \sa getContentsMargins(), setGeometry()
+*/
+void QGraphicsWidget::setContentsMargins(qreal left, qreal top, qreal right, qreal bottom)
+{
+    Q_D(QGraphicsWidget);
+
+    if (left == d->leftMargin
+        && top == d->topMargin
+        && right == d->rightMargin
+        && bottom == d->bottomMargin) {
+        return;
+    }
+
+    d->leftMargin = left;
+    d->topMargin = top;
+    d->rightMargin = right;
+    d->bottomMargin = bottom;
+
+    if (QGraphicsLayout *l = d->layout)
+        l->invalidate();
+    else
+        updateGeometry();
+
+    QEvent e(QEvent::ContentsRectChange);
+    QApplication::sendEvent(this, &e);
+}
+
+/*!
+    Gets the widget's contents margins. The margins are stored in \a left, \a
+    top, \a right and \a bottom, as pointers to qreals. Each argument can
+    be \e {omitted} by passing 0.
+
+    \sa setContentsMargins()
+*/
+void QGraphicsWidget::getContentsMargins(qreal *left, qreal *top, qreal *right, qreal *bottom) const
+{
+    Q_D(const QGraphicsWidget);
+    if (left)
+        *left = d->leftMargin;
+    if (top)
+        *top = d->topMargin;
+    if (right)
+        *right = d->rightMargin;
+    if (bottom)
+        *bottom = d->bottomMargin;
+}
+
+/*!
+    Sets the widget's window frame margins to \a left, \a top, \a right and
+    \a bottom. The default frame margins are provided by the style, and they
+    depend on the current window flags.
+
+    If you would like to draw your own window decoration, you can set your
+    own frame margins to override the default margins.
+
+    \sa unsetWindowFrameMargins(), getWindowFrameMargins(), windowFrameRect()
+*/
+void QGraphicsWidget::setWindowFrameMargins(qreal left, qreal top, qreal right, qreal bottom)
+{
+    Q_D(QGraphicsWidget);
+    bool unchanged = left == d->leftWindowFrameMargin && top == d->topWindowFrameMargin
+                     && right == d->rightWindowFrameMargin && bottom == d->bottomWindowFrameMargin;
+    if (d->setWindowFrameMargins && unchanged)
+        return;
+    if (!unchanged)
+        prepareGeometryChange();
+    d->leftWindowFrameMargin = left;
+    d->topWindowFrameMargin = top;
+    d->rightWindowFrameMargin = right;
+    d->bottomWindowFrameMargin = bottom;
+    d->setWindowFrameMargins = true;
+}
+
+/*!
+    Gets the widget's window frame margins. The margins are stored in \a left,
+    \a top, \a right and \a bottom as pointers to qreals. Each argument can
+    be \e {omitted} by passing 0.
+
+    \sa setWindowFrameMargins(), windowFrameRect()
+*/
+void QGraphicsWidget::getWindowFrameMargins(qreal *left, qreal *top, qreal *right, qreal *bottom) const
+{
+    Q_D(const QGraphicsWidget);
+    if (left)
+        *left = d->leftWindowFrameMargin;
+    if (top)
+        *top = d->topWindowFrameMargin;
+    if (right)
+        *right = d->rightWindowFrameMargin;
+    if (bottom)
+        *bottom = d->bottomWindowFrameMargin;
+}
+
+/*!
+    Resets the window frame margins to the default value, provided by the style.
+
+    \sa setWindowFrameMargins(), getWindowFrameMargins(), windowFrameRect()
+*/
+void QGraphicsWidget::unsetWindowFrameMargins()
+{
+    Q_D(QGraphicsWidget);
+    if ((d->windowFlags & Qt::Window) && (d->windowFlags & Qt::WindowType_Mask) != Qt::Popup && 
+         (d->windowFlags & Qt::WindowType_Mask) != Qt::ToolTip && !(d->windowFlags & Qt::FramelessWindowHint)) {
+        QStyleOptionTitleBar bar;
+        d->initStyleOptionTitleBar(&bar);
+        QStyle *style = this->style();
+        qreal margin = style->pixelMetric(QStyle::PM_MdiSubWindowFrameWidth);
+        qreal titleBarHeight  = d->titleBarHeight(bar);
+        setWindowFrameMargins(margin, titleBarHeight, margin, margin);
+    } else {
+        setWindowFrameMargins(0, 0, 0, 0);
+    }
+    d->setWindowFrameMargins = false;
+}
+
+/*!
+    Returns the widget's geometry in parent coordinates including any window
+    frame.
+
+    \sa windowFrameRect(), getWindowFrameMargins(), setWindowFrameMargins()
+*/
+QRectF QGraphicsWidget::windowFrameGeometry() const
+{
+    Q_D(const QGraphicsWidget);
+    return geometry().adjusted(-d->leftWindowFrameMargin, -d->topWindowFrameMargin,
+                               d->rightWindowFrameMargin, d->bottomWindowFrameMargin);
+}
+
+/*!
+    Returns the widget's local rect including any window frame.
+
+    \sa windowFrameGeometry(), getWindowFrameMargins(), setWindowFrameMargins()
+*/
+QRectF QGraphicsWidget::windowFrameRect() const
+{
+    Q_D(const QGraphicsWidget);
+    return rect().adjusted(-d->leftWindowFrameMargin, -d->topWindowFrameMargin,
+                           d->rightWindowFrameMargin, d->bottomWindowFrameMargin);
+}
+
+/*!
+    Populates a style option object for this widget based on its current
+    state, and stores the output in \a option. The default implementation
+    populates \a option with the following properties.
+
+    \table
+      \header
+        \o Style Option Property
+        \o Value
+      \row
+        \o state & QStyle::State_Enabled
+        \o Corresponds to QGraphicsItem::isEnabled().
+      \row
+        \o state & QStyle::State_HasFocus
+        \o Corresponds to QGraphicsItem::hasFocus().
+      \row
+        \o state & QStyle::State_MouseOver
+        \o Corresponds to QGraphicsItem::isUnderMouse().
+      \row
+        \o direction
+        \o Corresponds to QGraphicsWidget::layoutDirection().
+      \row
+        \o rect
+        \o Corresponds to QGraphicsWidget::rect().toRect().
+      \row
+        \o palette
+        \o Corresponds to QGraphicsWidget::palette().
+      \row
+        \o fontMetrics
+        \o Corresponds to QFontMetrics(QGraphicsWidget::font()).
+    \endtable
+
+    Subclasses of QGraphicsWidget should call the base implementation, and
+    then test the type of \a option using qstyleoption_cast<>() or test
+    QStyleOption::Type before storing widget-specific options.
+
+    For example:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicswidget.cpp 0
+
+    \sa QStyleOption::initFrom()
+*/
+void QGraphicsWidget::initStyleOption(QStyleOption *option) const
+{
+    Q_ASSERT(option);
+
+    option->state = QStyle::State_None;
+    if (isEnabled())
+        option->state |= QStyle::State_Enabled;
+    if (hasFocus())
+        option->state |= QStyle::State_HasFocus;
+    // if (window->testAttribute(Qt::WA_KeyboardFocusChange)) // ### Window
+    //     option->state |= QStyle::State_KeyboardFocusChange;
+    if (isUnderMouse())
+        option->state |= QStyle::State_MouseOver;
+    if (QGraphicsWidget *w = window()) {
+        if (w->isActiveWindow())
+            option->state |= QStyle::State_Active;
+    }
+    if (isWindow())
+        option->state |= QStyle::State_Window;
+    /*
+      ###
+#ifdef Q_WS_MAC
+    extern bool qt_mac_can_clickThrough(const QGraphicsWidget *w); //qwidget_mac.cpp
+    if (!(option->state & QStyle::State_Active) && !qt_mac_can_clickThrough(widget))
+        option->state &= ~QStyle::State_Enabled;
+
+    switch (QMacStyle::widgetSizePolicy(widget)) {
+    case QMacStyle::SizeSmall:
+        option->state |= QStyle::State_Small;
+        break;
+    case QMacStyle::SizeMini:
+        option->state |= QStyle::State_Mini;
+        break;
+    default:
+        ;
+    }
+#endif
+#ifdef QT_KEYPAD_NAVIGATION
+    if (widget->hasEditFocus())
+        state |= QStyle::State_HasEditFocus;
+#endif
+    */
+    option->direction = layoutDirection();
+    option->rect = rect().toRect(); // ### truncation!
+    option->palette = palette();
+    if (!isEnabled()) {
+        option->palette.setCurrentColorGroup(QPalette::Disabled);
+    } else if (isActiveWindow()) {
+        option->palette.setCurrentColorGroup(QPalette::Active);
+    } else {
+        option->palette.setCurrentColorGroup(QPalette::Inactive);
+    }
+    option->fontMetrics = QFontMetrics(font());
+}
+
+/*!
+    \reimp
+*/
+QSizeF QGraphicsWidget::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
+{
+    Q_D(const QGraphicsWidget);
+    QSizeF sh;
+    if (d->layout) {
+        sh = d->layout->effectiveSizeHint(which, constraint);
+        sh += QSizeF(d->leftMargin + d->rightMargin, d->topMargin + d->bottomMargin);
+    } else {
+        switch (which) {
+            case Qt::MinimumSize:
+                sh = QSizeF(0, 0);
+                break;
+            case Qt::PreferredSize:
+                sh = QSizeF(50, 50);    //rather arbitrary
+                break;
+            case Qt::MaximumSize:
+                sh = QSizeF(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX);
+                break;
+            default:
+                qWarning("QGraphicsWidget::sizeHint(): Don't know how to handle the value of 'which'");
+                break;
+        }
+    }
+    return sh;
+}
+
+/*!
+    Returns this widget's layout, or 0 if no layout is currently managing this
+    widget.
+
+    \sa setLayout()
+*/
+QGraphicsLayout *QGraphicsWidget::layout() const
+{
+    Q_D(const QGraphicsWidget);
+    return d->layout;
+}
+
+/*!
+    \fn void QGraphicsWidget::setLayout(QGraphicsLayout *layout)
+
+    Sets the layout for this widget to \a layout. Any existing layout manager
+    is deleted before the new layout is assigned. If \a layout is 0, the
+    widget is left without a layout. Existing subwidgets' geometries will
+    remain unaffected.
+
+    All widgets that are currently managed by \a layout or all of its
+    sublayouts, are automatically reparented to this item. The layout is then
+    invalidated, and the child widget geometries are adjusted according to
+    this item's geometry() and contentsMargins(). Children who are not
+    explicitly managed by \a layout remain unaffected by the layout after
+    it has been assigned to this widget.
+
+    QGraphicsWidget takes ownership of \a layout.
+
+    \sa layout(), QGraphicsLinearLayout::addItem(), QGraphicsLayout::invalidate()
+*/
+void QGraphicsWidget::setLayout(QGraphicsLayout *l)
+{
+    Q_D(QGraphicsWidget);
+    if (d->layout == l)
+        return;
+    d->setLayout_helper(l);
+    if (!l)
+        return;
+
+    // Prevent assigning a layout that is already assigned to another widget.
+    QGraphicsLayoutItem *oldParent = l->parentLayoutItem();
+    if (oldParent && oldParent != this) {
+        qWarning("QGraphicsWidget::setLayout: Attempting to set a layout on %s"
+                 " \"%s\", when the layout already has a parent",
+                 metaObject()->className(), qPrintable(objectName()));
+        return;
+    }
+
+    // Install and activate the layout.
+    l->setParentLayoutItem(this);
+    l->d_func()->reparentChildItems(this);
+    l->invalidate();
+}
+
+/*!
+    Adjusts the size of the widget to its effective preferred size hint.
+
+    This function is called implicitly when the item is shown for the first
+    time.
+
+    \sa effectiveSizeHint(), Qt::MinimumSize
+*/
+void QGraphicsWidget::adjustSize()
+{
+    QSizeF sz = effectiveSizeHint(Qt::PreferredSize);
+    // What if sz is not valid?!
+    if (sz.isValid())
+        resize(sz);
+}
+
+/*!
+    \property QGraphicsWidget::layoutDirection
+    \brief the layout direction for this widget.
+
+    This property modifies this widget's and all of its descendants'
+    Qt::WA_RightToLeft attribute. It also sets this widget's
+    Qt::WA_SetLayoutDirection attribute.
+
+    The widget's layout direction determines the order in which the layout
+    manager horizontally arranges subwidgets of this widget. The default
+    value depends on the language and locale of the application, and is
+    typically in the same direction as words are read and written. With
+    Qt::LeftToRight, the layout starts placing subwidgets from the left
+    side of this widget towards the right. Qt::RightToLeft does the opposite -
+    the layout will place widgets starting from the right edge moving towards
+    the left.
+
+    Subwidgets inherit their layout direction from the parent. Top-level
+    widget items inherit their layout direction from
+    QGraphicsScene::layoutDirection. If you change a widget's layout direction
+    by calling setLayoutDirection(), the widget will send itself a
+    \l{QEvent::LayoutDirectionChange}{LayoutDirectionChange} event, and then
+    propagate the new layout direction to all its descendants.
+
+    \sa QWidget::layoutDirection, QApplication::layoutDirection
+*/
+Qt::LayoutDirection QGraphicsWidget::layoutDirection() const
+{
+    return testAttribute(Qt::WA_RightToLeft) ? Qt::RightToLeft : Qt::LeftToRight;
+}
+void QGraphicsWidget::setLayoutDirection(Qt::LayoutDirection direction)
+{
+    Q_D(QGraphicsWidget);
+    setAttribute(Qt::WA_SetLayoutDirection, true);
+    d->setLayoutDirection_helper(direction);
+}
+void QGraphicsWidget::unsetLayoutDirection()
+{
+    Q_D(QGraphicsWidget);
+    setAttribute(Qt::WA_SetLayoutDirection, false);
+    d->resolveLayoutDirection();
+}
+
+/*!
+    Returns a pointer to the widget's style. If this widget does not have any
+    explicitly assigned style, the scene's style is returned instead. In turn,
+    if the scene does not have any assigned style, this function returns
+    QApplication::style().
+
+    \sa setStyle()
+*/
+QStyle *QGraphicsWidget::style() const
+{
+    if (QStyle *style = widgetStyles()->styleForWidget(this))
+        return style;
+    // ### This is not thread-safe. QApplication::style() is not thread-safe.
+    return scene() ? scene()->style() : QApplication::style();
+}
+
+/*!
+    Sets the widget's style to \a style. QGraphicsWidget does \e not take
+    ownership of \a style.
+
+    If no style is assigned, or \a style is 0, the widget will use
+    QGraphicsScene::style() (if this has been set). Otherwise the widget will
+    use QApplication::style().
+
+    This function sets the Qt::WA_SetStyle attribute if \a style is not 0;
+    otherwise it clears the attribute.
+
+    \sa style()
+*/
+void QGraphicsWidget::setStyle(QStyle *style)
+{
+    setAttribute(Qt::WA_SetStyle, style != 0);
+    widgetStyles()->setStyleForWidget(this, style);
+
+    // Deliver StyleChange to the widget itself (doesn't propagate).
+    QEvent event(QEvent::StyleChange);
+    QApplication::sendEvent(this, &event);
+}
+
+/*!
+    \property QGraphicsWidget::font
+    \brief the widgets' font
+
+    This property provides the widget's font.
+
+    QFont consists of font properties that have been explicitly defined and
+    properties implicitly inherited from the widget's parent. Hence, font()
+    can return a different font compared to the one set with setFont().
+    This scheme allows you to define single entries in a font without
+    affecting the font's inherited entries.
+
+    When a widget's font changes, it resolves its entries against its
+    parent widget. If the widget does not have a parent widget, it resolves
+    its entries against the scene. The widget then sends itself a
+    \l{QEvent::FontChange}{FontChange} event and notifies all its
+    descendants so that they can resolve their fonts as well.
+
+    By default, this property contains the application's default font.
+
+    \sa QApplication::font(), QGraphicsScene::font, QFont::resolve()
+*/
+QFont QGraphicsWidget::font() const
+{
+    Q_D(const QGraphicsWidget);
+    return d->font;
+}
+void QGraphicsWidget::setFont(const QFont &font)
+{
+    Q_D(QGraphicsWidget);
+    setAttribute(Qt::WA_SetFont, font.resolve() != 0);
+
+    QFont naturalFont = d->naturalWidgetFont();
+    QFont resolvedFont = font.resolve(naturalFont);
+    d->setFont_helper(resolvedFont);
+}
+
+/*!
+    \property QGraphicsWidget::palette
+    \brief the widget's palette
+
+    This property provides the widget's palette. The palette provides colors
+    and brushes for color groups (e.g., QPalette::Button) and states (e.g.,
+    QPalette::Inactive), loosely defining the general look of the widget and
+    its children.
+
+    QPalette consists of color groups that have been explicitly defined, and
+    groups that are implicitly inherited from the widget's parent. Because of
+    this, palette() can return a different palette than what has been set with
+    setPalette(). This scheme allows you to define single entries in a palette
+    without affecting the palette's inherited entries.
+
+    When a widget's palette changes, it resolves its entries against its
+    parent widget, or if it doesn't have a parent widget, it resolves against
+    the scene. It then sends itself a \l{QEvent::PaletteChange}{PaletteChange}
+    event, and notifies all its descendants so they can resolve their palettes
+    as well.
+
+    By default, this property contains the application's default palette.
+
+    \sa QApplication::palette(), QGraphicsScene::palette, QPalette::resolve()
+*/
+QPalette QGraphicsWidget::palette() const
+{
+    Q_D(const QGraphicsWidget);
+    return d->palette;
+}
+void QGraphicsWidget::setPalette(const QPalette &palette)
+{
+    Q_D(QGraphicsWidget);
+    setAttribute(Qt::WA_SetPalette, palette.resolve() != 0);
+
+    QPalette naturalPalette = d->naturalWidgetPalette();
+    QPalette resolvedPalette = palette.resolve(naturalPalette);
+    d->setPalette_helper(resolvedPalette);
+}
+
+/*!
+    If this widget is currently managed by a layout, this function notifies
+    the layout that the widget's size hints have changed and the layout
+    may need to resize and reposition the widget accordingly.
+
+    Call this function if the widget's sizeHint() has changed.
+
+    \sa QGraphicsLayout::invalidate()
+*/
+void QGraphicsWidget::updateGeometry()
+{
+    QGraphicsLayoutItem::updateGeometry();
+    QGraphicsLayoutItem *parentItem = parentLayoutItem();
+
+    if (parentItem && parentItem->isLayout()) {
+        parentItem->updateGeometry();
+    } else {
+        if (parentItem) {
+            QGraphicsWidget *parentWid = parentWidget();    //###
+            if (parentWid->isVisible())
+                QApplication::postEvent(parentWid, new QEvent(QEvent::LayoutRequest));
+        }
+        bool wasResized = testAttribute(Qt::WA_Resized);
+        resize(size()); // this will restrict the size
+        setAttribute(Qt::WA_Resized, wasResized);
+    }
+}
+
+/*!
+    \reimp
+
+    QGraphicsWidget uses the base implementation of this function to catch and
+    deliver events related to state changes in the item. Because of this, it is
+    very important that subclasses call the base implementation.
+
+    For example, QGraphicsWidget uses ItemVisibleChange to deliver \l Show and
+    \l Hide events, ItemPositionHasChanged to deliver \l Move events, and
+    ItemParentChange both to deliver \l ParentChange events, and for managing
+    the focus chain.
+
+    \sa propertyChange()
+*/
+QVariant QGraphicsWidget::itemChange(GraphicsItemChange change, const QVariant &value)
+{
+    Q_D(QGraphicsWidget);
+    switch (change) {
+    case ItemEnabledHasChanged: {
+        // Send EnabledChange after the enabled state has changed.
+        QEvent event(QEvent::EnabledChange);
+        QApplication::sendEvent(this, &event);
+        break;
+    }
+    case ItemVisibleChange:
+        if (value.toBool()) {
+            // Send Show event before the item has been shown.
+            QShowEvent event;
+            QApplication::sendEvent(this, &event);
+            bool resized = testAttribute(Qt::WA_Resized);
+            if (!resized) {
+                adjustSize();
+                setAttribute(Qt::WA_Resized, false);
+            }
+        }
+        break;
+    case ItemVisibleHasChanged:
+        if (!value.toBool()) {
+            // Send Hide event after the item has been hidden.
+            QHideEvent event;
+            QApplication::sendEvent(this, &event);
+        }
+        break;
+    case ItemPositionHasChanged:
+        if (!d->inSetGeometry) {
+            // Ensure setGeometry is called (avoid recursion when setPos is
+            // called from within setGeometry).
+            setGeometry(QRectF(pos(), size()));
+        }
+        break;
+    case ItemParentChange: {
+        QGraphicsItem *parent = qVariantValue<QGraphicsItem *>(value);
+        d->fixFocusChainBeforeReparenting((parent && parent->isWidget()) ? static_cast<QGraphicsWidget *>(parent) : 0);
+
+        // Deliver ParentAboutToChange.
+        QEvent event(QEvent::ParentAboutToChange);
+        QApplication::sendEvent(this, &event);
+        break;
+    }
+    case ItemParentHasChanged: {
+        // reset window type on parent change in order to automagically remove decorations etc.
+        Qt::WindowFlags wflags = d->windowFlags & ~Qt::WindowType_Mask;
+        d->adjustWindowFlags(&wflags);
+        setWindowFlags(wflags);
+        // Deliver ParentChange.
+        QEvent event(QEvent::ParentChange);
+        QApplication::sendEvent(this, &event);
+        break;
+    }
+    case ItemCursorChange: {
+        // Deliver CursorChange.
+        QEvent event(QEvent::CursorChange);
+        QApplication::sendEvent(this, &event);
+        break;
+    }
+    case ItemToolTipChange: {
+        // Deliver ToolTipChange.
+        QEvent event(QEvent::ToolTipChange);
+        QApplication::sendEvent(this, &event);
+        break;
+    }
+    default:
+        break;
+    }
+    return QGraphicsItem::itemChange(change, value);
+}
+
+/*!
+    \internal
+
+    This virtual function is used to notify changes to any property (both
+    dynamic properties, and registered with Q_PROPERTY) in the
+    widget. Depending on the property itself, the notification can be
+    delivered before or after the value has changed.
+
+    \a propertyName is the name of the property (e.g., "size" or "font"), and
+    \a value is the (proposed) new value of the property. The function returns
+    the new value, which may be different from \a value if the notification
+    supports adjusting the property value. The base implementation simply
+    returns \a value for any \a propertyName.
+
+    QGraphicsWidget delivers notifications for the following properties:
+
+    \table     \o propertyName        \o Property
+    \row       \o layoutDirection     \o QGraphicsWidget::layoutDirection
+    \row       \o size                \o QGraphicsWidget::size
+    \row       \o font                \o QGraphicsWidget::font
+    \row       \o palette             \o QGraphicsWidget::palette
+    \endtable
+
+    \sa itemChange()
+*/
+QVariant QGraphicsWidget::propertyChange(const QString &propertyName, const QVariant &value)
+{
+    Q_UNUSED(propertyName);
+    return value;
+}
+
+/*!
+    QGraphicsWidget's implementation of sceneEvent() simply passes \a event to
+    QGraphicsWidget::event(). You can handle all events for your widget in
+    event() or in any of the convenience functions; you should not have to
+    reimplement this function in a subclass of QGraphicsWidget.
+
+    \sa QGraphicsItem::sceneEvent()
+*/
+bool QGraphicsWidget::sceneEvent(QEvent *event)
+{
+    return QCoreApplication::sendEvent(this, event) || QGraphicsItem::sceneEvent(event);
+}
+
+/*!
+    This event handler, for \a event, receives events for the window frame if
+    this widget is a window. Its base implementation provides support for
+    default window frame interaction such as moving, resizing, etc.
+
+    You can reimplement this handler in a subclass of QGraphicsWidget to
+    provide your own custom window frame interaction support.
+
+    Returns true if \a event has been recognized and processed; otherwise,
+    returns false.
+    
+    \sa event()
+*/
+bool QGraphicsWidget::windowFrameEvent(QEvent *event)
+{
+    Q_D(QGraphicsWidget);
+    switch (event->type()) {
+    case QEvent::GraphicsSceneMousePress:
+        d->windowFrameMousePressEvent(static_cast<QGraphicsSceneMouseEvent *>(event));
+        break;
+    case QEvent::GraphicsSceneMouseMove:
+        if (d->grabbedSection != Qt::NoSection) {
+            d->windowFrameMouseMoveEvent(static_cast<QGraphicsSceneMouseEvent *>(event));
+            event->accept();
+        }
+        break;
+    case QEvent::GraphicsSceneMouseRelease:
+        d->windowFrameMouseReleaseEvent(static_cast<QGraphicsSceneMouseEvent *>(event));
+        break;
+    case QEvent::GraphicsSceneHoverMove:
+        d->windowFrameHoverMoveEvent(static_cast<QGraphicsSceneHoverEvent *>(event));
+        break;
+    case QEvent::GraphicsSceneHoverLeave:
+        d->windowFrameHoverLeaveEvent(static_cast<QGraphicsSceneHoverEvent *>(event));
+        break;
+    default:
+        break;
+    }
+    return event->isAccepted();
+}
+
+/*!
+    \since 4.4
+
+    Returns the window frame section at position \a pos, or
+    Qt::NoSection if there is no window frame section at this
+    position.
+
+    This function is used in QGraphicsWidget's base implementation for window
+    frame interaction.
+
+    You can reimplement this function if you want to customize how a window
+    can be interactively moved or resized.  For instance, if you only want to
+    allow a window to be resized by the bottom right corner, you can
+    reimplement this function to return Qt::NoSection for all sections except
+    Qt::BottomRightSection.
+
+    \sa windowFrameEvent(), paintWindowFrame(), windowFrameGeometry()
+*/
+Qt::WindowFrameSection QGraphicsWidget::windowFrameSectionAt(const QPointF &pos) const
+{
+    Q_D(const QGraphicsWidget);
+
+    const QRectF r = windowFrameRect();
+    if (!r.contains(pos))
+        return Qt::NoSection;
+    
+    const qreal left = r.left();
+    const qreal top = r.top();
+    const qreal right = r.right();
+    const qreal bottom = r.bottom();
+    const qreal x = pos.x();
+    const qreal y = pos.y();
+
+    const qreal cornerMargin = 20;
+    //### Not sure of this one, it should be the same value for all edges.
+    const qreal windowFrameWidth = d->leftWindowFrameMargin;
+
+    Qt::WindowFrameSection s = Qt::NoSection;
+    if (x <= left + cornerMargin) {
+        if (y <= top + windowFrameWidth || (x <= left + windowFrameWidth && y <= top + cornerMargin)) {
+            s = Qt::TopLeftSection;
+        } else if (y >= bottom - windowFrameWidth || (x <= left + windowFrameWidth && y >= bottom - windowFrameWidth)) {
+            s = Qt::BottomLeftSection;
+        } else if (x <= left + windowFrameWidth) {
+            s = Qt::LeftSection;
+        }
+    } else if (x >= right - cornerMargin) {
+        if (y <= top + windowFrameWidth || (x >= right - windowFrameWidth && y <= top + cornerMargin)) {
+            s = Qt::TopRightSection;
+        } else if (y >= bottom - windowFrameWidth || (x >= right - windowFrameWidth && y >= bottom - windowFrameWidth)) {
+            s = Qt::BottomRightSection;
+        } else if (x >= right - windowFrameWidth) {
+            s = Qt::RightSection;
+        }
+    } else if (y <= top + windowFrameWidth) {
+        s = Qt::TopSection;
+    } else if (y >= bottom - windowFrameWidth) {
+        s = Qt::BottomSection;
+    }
+    if (s == Qt::NoSection) {
+        QRectF r1 = r;
+        r1.setHeight(d->topWindowFrameMargin);
+        if (r1.contains(pos))
+            s = Qt::TitleBarArea;
+    }
+    return s;
+}
+
+/*!
+    \reimp
+
+    QGraphicsWidget handles the following events:
+
+    \table   \o Event                 \o Usage
+    \row     \o Polish
+                    \o Delivered to the widget some time after it has been
+                        shown.
+    \row     \o GraphicsSceneMove
+                    \o Delivered to the widget after its local position has
+                        changed.
+    \row     \o GraphicsSceneResize
+                    \o Delivered to the widget after its size has changed.
+    \row     \o Show
+                    \o Delivered to the widget before it has been shown.
+    \row     \o Hide
+                    \o Delivered to the widget after it has been hidden.
+    \row     \o PaletteChange
+                    \o Delivered to the widget after its palette has changed.
+    \row     \o FontChange
+                    \o Delivered to the widget after its font has changed.
+    \row     \o EnabledChange
+                    \o Delivered to the widget after its enabled state has
+                        changed.
+    \row     \o StyleChange
+                    \o Delivered to the widget after its style has changed.
+    \row     \o LayoutDirectionChange
+                    \o Delivered to the widget after its layout direction has
+                        changed.
+    \row     \o ContentsRectChange
+                    \o Delivered to the widget after its contents margins/
+                        contents rect has changed.
+    \endtable
+*/
+bool QGraphicsWidget::event(QEvent *event)
+{
+    Q_D(QGraphicsWidget);
+    // Forward the event to the layout first.
+    if (d->layout)
+        d->layout->widgetEvent(event);
+
+    // Handle the event itself.
+    switch (event->type()) {
+    case QEvent::GraphicsSceneMove:
+        moveEvent(static_cast<QGraphicsSceneMoveEvent *>(event));
+        break;
+    case QEvent::GraphicsSceneResize:
+        resizeEvent(static_cast<QGraphicsSceneResizeEvent *>(event));
+        break;
+    case QEvent::Show:
+        showEvent(static_cast<QShowEvent *>(event));
+        break;
+    case QEvent::Hide:
+        hideEvent(static_cast<QHideEvent *>(event));
+        break;
+    case QEvent::Polish:
+        polishEvent();
+        break;
+    case QEvent::WindowActivate:
+    case QEvent::WindowDeactivate:
+        update();
+        foreach (QGraphicsItem *child, childItems()) {
+            if (child->isWidget())
+                QApplication::sendEvent(static_cast<QGraphicsWidget *>(child), event);
+        }
+        break;
+        // Taken from QWidget::event
+    case QEvent::ActivationChange:
+    case QEvent::EnabledChange:
+    case QEvent::FontChange:
+    case QEvent::StyleChange:
+    case QEvent::PaletteChange:
+    case QEvent::ParentChange:
+    case QEvent::ContentsRectChange:
+    case QEvent::LayoutDirectionChange:
+        changeEvent(event);
+        break;
+    case QEvent::Close:
+        closeEvent((QCloseEvent *)event);
+        break;
+    case QEvent::GrabMouse:
+        grabMouseEvent(event);
+        break;
+    case QEvent::UngrabMouse:
+        ungrabMouseEvent(event);
+        break;
+    case QEvent::GrabKeyboard:
+        grabKeyboardEvent(event);
+        break;
+    case QEvent::UngrabKeyboard:
+        ungrabKeyboardEvent(event);
+        break;
+    case QEvent::GraphicsSceneMousePress:
+        if (d->hasDecoration() && windowFrameEvent(event))
+            return true;
+    case QEvent::GraphicsSceneMouseMove:
+    case QEvent::GraphicsSceneMouseRelease:
+    case QEvent::GraphicsSceneMouseDoubleClick:
+        if (d->hasDecoration() && d->grabbedSection != Qt::NoSection)
+            return windowFrameEvent(event);
+        break;
+    case QEvent::GraphicsSceneHoverEnter:
+    case QEvent::GraphicsSceneHoverMove:
+    case QEvent::GraphicsSceneHoverLeave:
+        if (d->hasDecoration()) {
+            windowFrameEvent(event);
+            // Filter out hover events if they were sent to us only because of the
+            // decoration (special case in QGraphicsScenePrivate::dispatchHoverEvent).
+            if (!acceptsHoverEvents())
+                return true;
+        }
+        break;
+    default:
+        break;
+    }
+    return QObject::event(event);
+}
+
+/*!
+   This event handler can be reimplemented to handle state changes.
+
+   The state being changed in this event can be retrieved through \a event.
+
+   Change events include: QEvent::ActivationChange, QEvent::EnabledChange,
+   QEvent::FontChange, QEvent::StyleChange, QEvent::PaletteChange,
+   QEvent::ParentChange, QEvent::LayoutDirectionChange, and
+   QEvent::ContentsRectChange.
+*/
+void QGraphicsWidget::changeEvent(QEvent *event)
+{
+    Q_D(QGraphicsWidget);
+    switch (event->type()) {
+    case QEvent::StyleChange:
+        // ### Don't unset if the margins are explicitly set.
+        unsetWindowFrameMargins();
+    case QEvent::FontChange:
+        update();
+        updateGeometry();
+        break;
+    case QEvent::PaletteChange:
+        update();
+        break;
+    case QEvent::ParentChange:
+        d->resolveFont(d->inheritedFontResolveMask);
+        d->resolvePalette(d->inheritedPaletteResolveMask);
+        break;
+    default:
+        break;
+    }
+}
+
+/*!
+    This event handler, for \a event, can be reimplemented in a subclass to
+    receive widget close events.  The default implementation accepts the
+    event.
+
+    \sa close(), QCloseEvent
+*/
+void QGraphicsWidget::closeEvent(QCloseEvent *event)
+{
+    event->accept();
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsWidget::focusInEvent(QFocusEvent *event)
+{
+    Q_UNUSED(event);
+    if (focusPolicy() != Qt::NoFocus)
+        update();
+}
+
+/*!
+    Finds a new widget to give the keyboard focus to, as appropriate for Tab
+    and Shift+Tab, and returns true if it can find a new widget; returns false
+    otherwise. If \a next is true, this function searches forward; if \a next
+    is false, it searches backward.
+
+    Sometimes, you will want to reimplement this function to provide special
+    focus handling for your widget and its subwidgets. For example, a web
+    browser might reimplement it to move its current active link forward or
+    backward, and call the base implementation only when it reaches the last
+    or first link on the page.
+
+    Child widgets call focusNextPrevChild() on their parent widgets, but only
+    the window that contains the child widgets decides where to redirect
+    focus. By reimplementing this function for an object, you gain control of
+    focus traversal for all child widgets.
+
+    \sa focusPolicy()
+*/
+bool QGraphicsWidget::focusNextPrevChild(bool next)
+{
+    Q_D(QGraphicsWidget);
+    // Let the parent's focusNextPrevChild implementation decide what to do.
+    QGraphicsWidget *parent = 0;
+    if (!isWindow() && (parent = parentWidget()))
+        return parent->focusNextPrevChild(next);
+    if (!d->scene)
+        return false;
+    if (d->scene->focusNextPrevChild(next))
+        return true;
+    if (isWindow()) {
+        setFocus(next ? Qt::TabFocusReason : Qt::BacktabFocusReason);
+        if (hasFocus())
+            return true;
+    }
+    return false;
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsWidget::focusOutEvent(QFocusEvent *event)
+{
+    Q_UNUSED(event);
+    if (focusPolicy() != Qt::NoFocus)
+        update();
+}
+
+/*!
+    This event handler, for \l{QEvent::Hide}{Hide} events, is delivered after
+    the widget has been hidden, for example, setVisible(false) has been called
+    for the widget or one of its ancestors when the widget was previously
+    shown.
+
+    You can reimplement this event handler to detect when your widget is
+    hidden. Calling QEvent::accept() or QEvent::ignore() on \a event has no
+    effect.
+
+    \sa showEvent(), QWidget::hideEvent(), ItemVisibleChange
+*/
+void QGraphicsWidget::hideEvent(QHideEvent *event)
+{
+    ///### focusNextPrevChild(true), don't lose focus when the focus widget
+    // is hidden.
+    Q_UNUSED(event);
+}
+
+/*!
+    This event handler, for \l{QEvent::GraphicsSceneMove}{GraphicsSceneMove}
+    events, is delivered after the widget has moved (e.g., its local position
+    has changed).
+
+    This event is only delivered when the item is moved locally. Calling
+    setTransform() or moving any of the item's ancestors does not affect the
+    item's local position.
+
+    You can reimplement this event handler to detect when your widget has
+    moved. Calling QEvent::accept() or QEvent::ignore() on \a event has no
+    effect.
+
+    \sa ItemPositionChange, ItemPositionHasChanged
+*/
+void QGraphicsWidget::moveEvent(QGraphicsSceneMoveEvent *event)
+{
+    // ### Last position is always == current position
+    Q_UNUSED(event);
+}
+
+/*!
+    This event is delivered to the item by the scene at some point after it
+    has been constructed, but before it is shown or otherwise accessed through
+    the scene. You can use this event handler to do last-minute initializations
+    of the widget which require the item to be fully constructed.
+
+    The base implementation does nothing.
+*/
+void QGraphicsWidget::polishEvent()
+{
+}
+
+/*!
+    This event handler, for
+    \l{QEvent::GraphicsSceneResize}{GraphicsSceneResize} events, is
+    delivered after the widget has been resized (i.e., its local size has
+    changed). \a event contains both the old and the new size.
+
+    This event is only delivered when the widget is resized locally; calling
+    setTransform() on the widget or any of its ancestors or view, does not
+    affect the widget's local size.
+
+    You can reimplement this event handler to detect when your widget has been
+    resized. Calling QEvent::accept() or QEvent::ignore() on \a event has no
+    effect.
+
+    \sa geometry(), setGeometry()
+*/
+void QGraphicsWidget::resizeEvent(QGraphicsSceneResizeEvent *event)
+{
+    Q_UNUSED(event);
+}
+
+/*!
+    This event handler, for \l{QEvent::Show}{Show} events, is delivered before
+    the widget has been shown, for example, setVisible(true) has been called
+    for the widget or one of its ancestors when the widget was previously
+    hidden.
+
+    You can reimplement this event handler to detect when your widget is
+    shown. Calling QEvent::accept() or QEvent::ignore() on \a event has no
+    effect.
+
+    \sa hideEvent(), QWidget::showEvent(), ItemVisibleChange
+*/
+void QGraphicsWidget::showEvent(QShowEvent *event)
+{
+    Q_UNUSED(event);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsWidget::hoverMoveEvent(QGraphicsSceneHoverEvent *event)
+{
+    Q_UNUSED(event);
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsWidget::hoverLeaveEvent(QGraphicsSceneHoverEvent *event)
+{
+    Q_UNUSED(event);
+}
+
+/*!
+    This event handler, for \a event, can be reimplemented in a subclass to
+    receive notifications for Qt::GrabMouse events.
+
+    \sa grabMouse(), grabKeyboard()
+*/
+void QGraphicsWidget::grabMouseEvent(QEvent *event)
+{
+    Q_UNUSED(event);
+}
+
+/*!
+    This event handler, for \a event, can be reimplemented in a subclass to
+    receive notifications for Qt::UngrabMouse events.
+
+    \sa ungrabMouse(), ungrabKeyboard()
+*/
+void QGraphicsWidget::ungrabMouseEvent(QEvent *event)
+{
+    Q_UNUSED(event);
+}
+
+/*!
+    This event handler, for \a event, can be reimplemented in a subclass to
+    receive notifications for Qt::GrabKeyboard events.
+
+    \sa grabKeyboard(), grabMouse()
+*/
+void QGraphicsWidget::grabKeyboardEvent(QEvent *event)
+{
+    Q_UNUSED(event);
+}
+
+/*!
+    This event handler, for \a event, can be reimplemented in a subclass to
+    receive notifications for Qt::UngrabKeyboard events.
+
+    \sa ungrabKeyboard(), ungrabMouse()
+*/
+void QGraphicsWidget::ungrabKeyboardEvent(QEvent *event)
+{
+    Q_UNUSED(event);
+}
+
+/*!
+    Returns the widgets window type.
+*/
+Qt::WindowType QGraphicsWidget::windowType() const
+{
+    return Qt::WindowType(int(windowFlags()) & Qt::WindowType_Mask);
+}
+
+/*!
+    \property QGraphicsWidget::windowFlags
+    \brief the widget's window flags
+
+    Window flags are a combination of a window type (e.g., Qt::Dialog) and
+    several flags giving hints on the behavior of the window. The behavior
+    is platform-dependent.
+
+    By default, this property contains no window flags.
+*/
+Qt::WindowFlags QGraphicsWidget::windowFlags() const
+{
+    Q_D(const QGraphicsWidget);
+    return d->windowFlags;
+}
+void QGraphicsWidget::setWindowFlags(Qt::WindowFlags wFlags)
+{
+    Q_D(QGraphicsWidget);
+    if (d->windowFlags == wFlags)
+        return;
+    bool wasPopup = (d->windowFlags & Qt::WindowType_Mask) == Qt::Popup;
+
+    d->windowFlags = wFlags;
+    if (!d->setWindowFrameMargins)
+        unsetWindowFrameMargins();
+
+    bool isPopup = (d->windowFlags & Qt::WindowType_Mask) == Qt::Popup;
+    if (d->scene && isVisible() && wasPopup != isPopup) {
+        // Popup state changed; update implicit mouse grab.
+        if (!isPopup)
+            d->scene->d_func()->removePopup(this);
+        else
+            d->scene->d_func()->addPopup(this);
+    }
+}
+
+/*!
+    Returns true if this widget's window is in the active window, or if the
+    widget does not have a window but is in an active scene (i.e., a scene
+    that currently has focus).
+
+    The active window is the window that either contains a child widget that
+    currently has input focus, or that itself has input focus.
+
+    \sa QGraphicsScene::activeWindow(), QGraphicsScene::setActiveWindow()
+*/
+bool QGraphicsWidget::isActiveWindow() const
+{
+    Q_D(const QGraphicsWidget);
+    if (!d->scene)
+        return false;
+    const QGraphicsWidget *w = window();
+    return (!w && d->scene->d_func()->activationRefCount) || (w && d->scene->activeWindow() == w);
+}
+
+/*!
+    \property QGraphicsWidget::windowTitle
+    \brief This property holds the window title (caption).
+
+    This property is only used for windows.
+
+    By default, if no title has been set, this property contains an empty string.
+*/
+void QGraphicsWidget::setWindowTitle(const QString &title)
+{
+    Q_D(QGraphicsWidget);
+    d->windowTitle = title;
+}
+QString QGraphicsWidget::windowTitle() const
+{
+    Q_D(const QGraphicsWidget);
+    return d->windowTitle;
+}
+
+/*!
+    \property QGraphicsWidget::focusPolicy
+    \brief the way the widget accepts keyboard focus
+
+    The focus policy is Qt::TabFocus if the widget accepts keyboard focus by
+    tabbing, Qt::ClickFocus if the widget accepts focus by clicking,
+    Qt::StrongFocus if it accepts both, and Qt::NoFocus (the default) if it
+    does not accept focus at all.
+
+    You must enable keyboard focus for a widget if it processes keyboard
+    events. This is normally done from the widget's constructor. For instance,
+    the QLineEdit constructor calls setFocusPolicy(Qt::StrongFocus).
+
+    If you enable a focus policy (i.e., not Qt::NoFocus), QGraphicsWidget will
+    automatically enable the ItemIsFocusable flag.  Setting Qt::NoFocus on a
+    widget will clear the ItemIsFocusable flag. If the widget currently has
+    keyboard focus, the widget will automatically lose focus.
+
+    \sa focusInEvent(), focusOutEvent(), keyPressEvent(), keyReleaseEvent(), enabled
+*/
+Qt::FocusPolicy QGraphicsWidget::focusPolicy() const
+{
+    Q_D(const QGraphicsWidget);
+    return d->focusPolicy;
+}
+void QGraphicsWidget::setFocusPolicy(Qt::FocusPolicy policy)
+{
+    Q_D(QGraphicsWidget);
+    if (d->focusPolicy == policy)
+        return;
+    d->focusPolicy = policy;
+    if (hasFocus() && policy == Qt::NoFocus)
+        clearFocus();
+    setFlag(ItemIsFocusable, policy != Qt::NoFocus);
+}
+
+/*!
+    If this widget, a child or descendant of this widget currently has input
+    focus, this function will return a pointer to that widget. If
+    no descendant has input focus, 0 is returned.
+
+    \sa QWidget::focusWidget()
+*/
+QGraphicsWidget *QGraphicsWidget::focusWidget() const
+{
+    Q_D(const QGraphicsWidget);
+    return d->focusChild;
+}
+
+
+#ifndef QT_NO_SHORTCUT
+/*!
+    \since 4.5
+
+    Adds a shortcut to Qt's shortcut system that watches for the given key \a
+    sequence in the given \a context. If the \a context is
+    Qt::ApplicationShortcut, the shortcut applies to the application as a
+    whole. Otherwise, it is either local to this widget, Qt::WidgetShortcut,
+    or to the window itself, Qt::WindowShortcut. For widgets that are not part
+    of a window (i.e., top-level widgets and their children),
+    Qt::WindowShortcut shortcuts apply to the scene.
+
+    If the same key \a sequence has been grabbed by several widgets,
+    when the key \a sequence occurs a QEvent::Shortcut event is sent
+    to all the widgets to which it applies in a non-deterministic
+    order, but with the ``ambiguous'' flag set to true.
+
+    \warning You should not normally need to use this function;
+    instead create \l{QAction}s with the shortcut key sequences you
+    require (if you also want equivalent menu options and toolbar
+    buttons), or create \l{QShortcut}s if you just need key sequences.
+    Both QAction and QShortcut handle all the event filtering for you,
+    and provide signals which are triggered when the user triggers the
+    key sequence, so are much easier to use than this low-level
+    function.
+
+    \sa releaseShortcut() setShortcutEnabled() QWidget::grabShortcut()
+*/
+int QGraphicsWidget::grabShortcut(const QKeySequence &sequence, Qt::ShortcutContext context)
+{
+    Q_ASSERT(qApp);
+    if (sequence.isEmpty())
+        return 0;
+    // ### setAttribute(Qt::WA_GrabbedShortcut);
+    return qApp->d_func()->shortcutMap.addShortcut(this, sequence, context);
+}
+
+/*!
+    \since 4.5
+
+    Removes the shortcut with the given \a id from Qt's shortcut
+    system. The widget will no longer receive QEvent::Shortcut events
+    for the shortcut's key sequence (unless it has other shortcuts
+    with the same key sequence).
+
+    \warning You should not normally need to use this function since
+    Qt's shortcut system removes shortcuts automatically when their
+    parent widget is destroyed. It is best to use QAction or
+    QShortcut to handle shortcuts, since they are easier to use than
+    this low-level function. Note also that this is an expensive
+    operation.
+
+    \sa grabShortcut() setShortcutEnabled() , QWidget::releaseShortcut()
+*/
+void QGraphicsWidget::releaseShortcut(int id)
+{
+    Q_ASSERT(qApp);
+    if (id)
+        qApp->d_func()->shortcutMap.removeShortcut(id, this, 0);
+}
+
+/*!
+    \since 4.5
+
+    If \a enabled is true, the shortcut with the given \a id is
+    enabled; otherwise the shortcut is disabled.
+
+    \warning You should not normally need to use this function since
+    Qt's shortcut system enables/disables shortcuts automatically as
+    widgets become hidden/visible and gain or lose focus. It is best
+    to use QAction or QShortcut to handle shortcuts, since they are
+    easier to use than this low-level function.
+
+    \sa grabShortcut() releaseShortcut(), QWidget::setShortcutEnabled()
+*/
+void QGraphicsWidget::setShortcutEnabled(int id, bool enabled)
+{
+    Q_ASSERT(qApp);
+    if (id)
+        qApp->d_func()->shortcutMap.setShortcutEnabled(enabled, id, this, 0);
+}
+
+/*!
+    \since 4.5
+
+    If \a enabled is true, auto repeat of the shortcut with the
+    given \a id is enabled; otherwise it is disabled.
+
+    \sa grabShortcut() releaseShortcut() QWidget::setShortcutAutoRepeat()
+*/
+void QGraphicsWidget::setShortcutAutoRepeat(int id, bool enabled)
+{
+    Q_ASSERT(qApp);
+    if (id)
+        qApp->d_func()->shortcutMap.setShortcutAutoRepeat(enabled, id, this, 0);
+}
+#endif
+
+#ifndef QT_NO_ACTION
+/*!
+    \since 4.5
+
+    Appends the action \a action to this widget's list of actions.
+
+    All QGraphicsWidgets have a list of \l{QAction}s, however they can be
+    represented graphically in many different ways. The default use of the
+    QAction list (as returned by actions()) is to create a context QMenu.
+
+    A QGraphicsWidget should only have one of each action and adding an action
+    it already has will not cause the same action to be in the widget twice.
+
+    \sa removeAction(), insertAction(), actions(), QWidget::addAction()
+*/
+void QGraphicsWidget::addAction(QAction *action)
+{
+    insertAction(0, action);
+}
+
+/*!
+    \since 4.5
+
+    Appends the actions \a actions to this widget's list of actions.
+
+    \sa removeAction(), QMenu, addAction(), QWidget::addActions()
+*/
+void QGraphicsWidget::addActions(QList<QAction *> actions)
+{
+    for (int i = 0; i < actions.count(); ++i)
+        insertAction(0, actions.at(i));
+}
+
+/*!
+    \since 4.5
+
+    Inserts the action \a action to this widget's list of actions,
+    before the action \a before. It appends the action if \a before is 0 or
+    \a before is not a valid action for this widget.
+
+    A QGraphicsWidget should only have one of each action.
+
+    \sa removeAction(), addAction(), QMenu, actions(),
+    QWidget::insertActions()
+*/
+void QGraphicsWidget::insertAction(QAction *before, QAction *action)
+{
+    if (!action) {
+        qWarning("QWidget::insertAction: Attempt to insert null action");
+        return;
+    }
+
+    Q_D(QGraphicsWidget);
+    int index = d->actions.indexOf(action);
+    if (index != -1)
+        d->actions.removeAt(index);
+
+    int pos = d->actions.indexOf(before);
+    if (pos < 0) {
+        before = 0;
+        pos = d->actions.size();
+    }
+    d->actions.insert(pos, action);
+
+    QActionPrivate *apriv = action->d_func();
+    apriv->graphicsWidgets.append(this);
+
+    QActionEvent e(QEvent::ActionAdded, action, before);
+    QApplication::sendEvent(this, &e);
+}
+
+/*!
+    \since 4.5
+
+    Inserts the actions \a actions to this widget's list of actions,
+    before the action \a before. It appends the action if \a before is 0 or
+    \a before is not a valid action for this widget.
+
+    A QGraphicsWidget can have at most one of each action.
+
+    \sa removeAction(), QMenu, insertAction(), QWidget::insertActions()
+*/
+void QGraphicsWidget::insertActions(QAction *before, QList<QAction *> actions)
+{
+    for (int i = 0; i < actions.count(); ++i)
+        insertAction(before, actions.at(i));
+}
+
+/*!
+    \since 4.5
+
+    Removes the action \a action from this widget's list of actions.
+
+    \sa insertAction(), actions(), insertAction(), QWidget::removeAction()
+*/
+void QGraphicsWidget::removeAction(QAction *action)
+{
+    if (!action)
+        return;
+
+    Q_D(QGraphicsWidget);
+
+    QActionPrivate *apriv = action->d_func();
+    apriv->graphicsWidgets.removeAll(this);
+
+    if (d->actions.removeAll(action)) {
+        QActionEvent e(QEvent::ActionRemoved, action);
+        QApplication::sendEvent(this, &e);
+    }
+}
+
+/*!
+    \since 4.5
+
+    Returns the (possibly empty) list of this widget's actions.
+
+    \sa insertAction(), removeAction(), QWidget::actions(),
+    QAction::associatedWidgets(), QAction::associatedGraphicsWidgets()
+*/
+QList<QAction *> QGraphicsWidget::actions() const
+{
+    Q_D(const QGraphicsWidget);
+    return d->actions;
+}
+#endif
+
+/*!
+    Moves the \a second widget around the ring of focus widgets so that
+    keyboard focus moves from the \a first widget to the \a second widget when
+    the Tab key is pressed.
+
+    Note that since the tab order of the \a second widget is changed, you
+    should order a chain like this:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicswidget.cpp 1
+
+    \e not like this:
+
+    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicswidget.cpp 2
+
+    If \a first is 0, this indicates that \a second should be the first widget
+    to receive input focus should the scene gain Tab focus (i.e., the user
+    hits Tab so that focus passes into the scene). If \a second is 0, this
+    indicates that \a first should be the first widget to gain focus if the
+    scene gained BackTab focus.
+
+    By default, tab order is defined implicitly using widget creation order.
+
+    \sa focusPolicy, {Keyboard Focus}
+*/
+void QGraphicsWidget::setTabOrder(QGraphicsWidget *first, QGraphicsWidget *second)
+{
+    if (!first && !second) {
+        qWarning("QGraphicsWidget::setTabOrder(0, 0) is undefined");
+        return;
+    }
+    if ((first && second) && first->scene() != second->scene()) {
+        qWarning("QGraphicsWidget::setTabOrder: scenes %p and %p are different",
+                 first->scene(), second->scene());
+        return;
+    }
+    QGraphicsScene *scene = first ? first->scene() : second->scene();
+    if (!scene && (!first || !second)) {
+        qWarning("QGraphicsWidget::setTabOrder: assigning tab order from/to the"
+                 " scene requires the item to be in a scene.");
+        return;
+    }
+
+    // If either first or second are 0, the scene's tabFocusFirst is updated
+    // to point to the first item in the scene's focus chain. Then first or
+    // second are set to point to tabFocusFirst.
+    QGraphicsScenePrivate *sceneD = scene->d_func();
+    if (!first) {
+        sceneD->tabFocusFirst = second;
+        return;
+    }
+    if (!second) {
+        sceneD->tabFocusFirst = first->d_func()->focusNext;
+        return;
+    }
+
+    // Both first and second are != 0.
+    QGraphicsWidget *firstFocusNext = first->d_func()->focusNext;
+    if (firstFocusNext == second) {
+        // Nothing to do.
+        return;
+    }
+
+    // Update the focus chain.
+    QGraphicsWidget *secondFocusPrev = second->d_func()->focusPrev;
+    QGraphicsWidget *secondFocusNext = second->d_func()->focusNext;
+    firstFocusNext->d_func()->focusPrev = second;
+    first->d_func()->focusNext = second;
+    second->d_func()->focusNext = firstFocusNext;
+    second->d_func()->focusPrev = first;
+    secondFocusPrev->d_func()->focusNext = secondFocusNext;
+    secondFocusNext->d_func()->focusPrev = secondFocusPrev;
+
+    Q_ASSERT(first->d_func()->focusNext->d_func()->focusPrev == first);
+    Q_ASSERT(first->d_func()->focusPrev->d_func()->focusNext == first);
+
+    Q_ASSERT(second->d_func()->focusNext->d_func()->focusPrev == second);
+    Q_ASSERT(second->d_func()->focusPrev->d_func()->focusNext == second);
+
+}
+
+/*!
+    If \a on is true, this function enables \a attribute; otherwise
+    \a attribute is disabled.
+
+    See the class documentation for QGraphicsWidget for a complete list of
+    which attributes are supported, and what they are for.
+
+    \sa testAttribute(), QWidget::setAttribute()
+*/
+void QGraphicsWidget::setAttribute(Qt::WidgetAttribute attribute, bool on)
+{
+    Q_D(QGraphicsWidget);
+    // ### most flags require some immediate action
+    // ### we might want to qWarn use of unsupported attributes
+    // ### we might want to not use Qt::WidgetAttribute, but roll our own instead
+    d->setAttribute(attribute, on);
+}
+
+/*!
+    Returns true if \a attribute is enabled for this widget; otherwise,
+    returns false.
+
+    \sa setAttribute()
+*/
+bool QGraphicsWidget::testAttribute(Qt::WidgetAttribute attribute) const
+{
+    Q_D(const QGraphicsWidget);
+    return d->testAttribute(attribute);
+}
+
+/*!
+    \reimp
+*/
+int QGraphicsWidget::type() const
+{
+    return Type;
+}
+
+/*!
+    \reimp
+*/
+void QGraphicsWidget::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
+{
+    Q_UNUSED(painter);
+    Q_UNUSED(option);
+    Q_UNUSED(widget);
+}
+
+/*!
+    This virtual function is called by QGraphicsScene to draw the window frame
+    for windows using \a painter, \a option, and \a widget, in local
+    coordinates. The base implementation uses the current style to render the
+    frame and title bar.
+
+    You can reimplement this function in a subclass of QGraphicsWidget to
+    provide custom rendering of the widget's window frame.
+
+    \sa QGraphicsItem::paint()
+*/
+void QGraphicsWidget::paintWindowFrame(QPainter *painter, const QStyleOptionGraphicsItem *option,
+                                       QWidget *widget)
+{
+    const bool fillBackground = !testAttribute(Qt::WA_OpaquePaintEvent)
+                                && !testAttribute(Qt::WA_NoSystemBackground);
+    QGraphicsProxyWidget *proxy = qobject_cast<QGraphicsProxyWidget *>(this);
+    const bool embeddedWidgetFillsOwnBackground = proxy && proxy->widget();
+
+    if (rect().contains(option->exposedRect)) {
+        if (fillBackground && !embeddedWidgetFillsOwnBackground)
+            painter->fillRect(option->exposedRect, palette().window());
+        return;
+    }
+
+    Q_D(QGraphicsWidget);
+
+    QRect windowFrameRect = QRect(QPoint(), windowFrameGeometry().size().toSize());
+    QStyleOptionTitleBar bar;
+    bar.QStyleOption::operator=(*option);
+    d->initStyleOptionTitleBar(&bar);   // this clear flags in bar.state
+    if (d->buttonMouseOver)
+        bar.state |= QStyle::State_MouseOver;
+    else
+        bar.state &= ~QStyle::State_MouseOver;
+    if (d->buttonSunken)
+        bar.state |= QStyle::State_Sunken;
+    else
+        bar.state &= ~QStyle::State_Sunken;
+
+    bar.rect = windowFrameRect;
+
+    // translate painter to make the style happy
+    const QPointF styleOrigin = this->windowFrameRect().topLeft();
+    painter->translate(styleOrigin);
+
+#ifdef Q_WS_MAC
+    const QSize pixmapSize = windowFrameRect.size();
+    if (pixmapSize.width() <= 0 || pixmapSize.height() <= 0)
+        return;
+    QPainter *realPainter = painter;
+    QPixmap pm(pixmapSize);
+    painter = new QPainter(&pm);
+#endif
+
+    // Fill background
+    QStyleHintReturnMask mask;
+    bool setMask = style()->styleHint(QStyle::SH_WindowFrame_Mask, &bar, widget, &mask) && !mask.region.isEmpty();
+    bool hasBorder = !style()->styleHint(QStyle::SH_TitleBar_NoBorder, &bar, widget);
+    int frameWidth = style()->pixelMetric(QStyle::PM_MDIFrameWidth, &bar, widget);
+    if (setMask) {
+        painter->save();
+        painter->setClipRegion(mask.region, Qt::IntersectClip);
+    }
+    if (fillBackground) {
+        if (embeddedWidgetFillsOwnBackground) {
+            // Don't fill the background twice.
+            QPainterPath windowFrameBackground;
+            windowFrameBackground.addRect(windowFrameRect);
+            // Adjust with 0.5 to avoid border artifacts between
+            // widget background and frame background.
+            windowFrameBackground.addRect(rect().translated(-styleOrigin).adjusted(0.5, 0.5, -0.5, -0.5));
+            painter->fillPath(windowFrameBackground, palette().window());
+        } else {
+            painter->fillRect(windowFrameRect, palette().window());
+        }
+    }
+    painter->setRenderHint(QPainter::NonCosmeticDefaultPen);
+
+    // Draw title
+    int height = (int)d->titleBarHeight(bar);
+    bar.rect.setHeight(height);
+    if (hasBorder) // Frame is painted by PE_FrameWindow
+        bar.rect.adjust(frameWidth, frameWidth, -frameWidth, 0);
+
+    painter->save();
+    painter->setFont(QApplication::font("QWorkspaceTitleBar"));
+    style()->drawComplexControl(QStyle::CC_TitleBar, &bar, painter, widget);
+    painter->restore();
+    if (setMask)
+        painter->restore();
+    // Draw window frame
+    QStyleOptionFrame frameOptions;
+    frameOptions.QStyleOption::operator=(*option);
+    initStyleOption(&frameOptions);
+    if (!hasBorder)
+        painter->setClipRect(windowFrameRect.adjusted(0, +height, 0, 0), Qt::IntersectClip);
+    if (hasFocus()) {
+        frameOptions.state |= QStyle::State_HasFocus;
+    } else {
+        frameOptions.state &= ~QStyle::State_HasFocus;
+    }
+    bool isActive = isActiveWindow();
+    if (isActive) {
+        frameOptions.state |= QStyle::State_Active;
+    } else {
+        frameOptions.state &= ~QStyle::State_Active;
+    }
+
+    frameOptions.palette.setCurrentColorGroup(isActive ? QPalette::Active : QPalette::Normal);
+    frameOptions.rect = windowFrameRect;
+    frameOptions.lineWidth = style()->pixelMetric(QStyle::PM_MdiSubWindowFrameWidth, 0, widget);
+    frameOptions.midLineWidth = 1;
+    style()->drawPrimitive(QStyle::PE_FrameWindow, &frameOptions, painter, widget);
+
+#ifdef Q_WS_MAC
+    realPainter->drawPixmap(QPoint(), pm);
+    delete painter;
+#endif
+}
+
+/*!
+    \reimp
+*/
+QRectF QGraphicsWidget::boundingRect() const
+{
+    return windowFrameRect();
+}
+
+/*!
+    \reimp
+*/
+QPainterPath QGraphicsWidget::shape() const
+{
+    QPainterPath path;
+    path.addRect(rect());
+    return path;
+}
+
+/*!
+    Call this function to close the widget.
+
+    Returns true if the widget was closed; otherwise returns false.
+    This slot will first send a QCloseEvent to the widget, which may or may
+    not accept the event. If the event was ignored, nothing happens. If the
+    event was accepted, it will hide() the widget.
+
+    If the widget has the Qt::WA_DeleteOnClose attribute set it will be
+    deleted.
+*/
+bool QGraphicsWidget::close()
+{
+    QCloseEvent closeEvent;
+    QApplication::sendEvent(this, &closeEvent);
+    if (!closeEvent.isAccepted()) {
+        return false;
+    }
+    // hide
+    if (isVisible()) {
+        hide();
+    }
+    if (testAttribute(Qt::WA_DeleteOnClose)) {
+        deleteLater();
+    }
+    return true;
+}
+
+#ifdef Q_NO_USING_KEYWORD
+/*!
+    \fn const QObjectList &QGraphicsWidget::children() const
+
+    This function returns the same value as QObject::children(). It's
+    provided to differentiate between the obsolete member
+    QGraphicsItem::children() and QObject::children(). QGraphicsItem now
+    provides childItems() instead.
+*/
+#endif
+
+#if 0
+void QGraphicsWidget::dumpFocusChain()
+{
+    qDebug() << "=========== Dumping focus chain ==============";
+    int i = 0;
+    QGraphicsWidget *next = this;
+    QSet<QGraphicsWidget*> visited;
+    do {
+        if (!next) {
+            qWarning("Found a focus chain that is not circular, (next == 0)");
+            break;
+        }
+        qDebug() << i++ << QString::number(uint(next), 16) << next->className() << next->data(0) << QString::fromAscii("focusItem:%1").arg(next->hasFocus() ? "1" : "0") << QLatin1String("next:") << next->d_func()->focusNext->data(0) << QLatin1String("prev:") << next->d_func()->focusPrev->data(0);
+        if (visited.contains(next)) {
+            qWarning("Already visited this node. However, I expected to dump until I found myself.");
+            break;
+        }
+        visited << next;
+        next = next->d_func()->focusNext;
+    } while (next != this);
+}
+#endif
+
+QT_END_NAMESPACE
+        
+#endif //QT_NO_GRAPHICSVIEW
diff --git a/src/gui/graphicsview/qgraphicswidget.h b/src/gui/graphicsview/qgraphicswidget.h
new file mode 100644
index 0000000..05195b6
--- /dev/null
+++ b/src/gui/graphicsview/qgraphicswidget.h
@@ -0,0 +1,255 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QGRAPHICSWIDGET_H
+#define QGRAPHICSWIDGET_H
+
+#include <QtGui/qfont.h>
+#include <QtGui/qgraphicslayoutitem.h>
+#include <QtGui/qgraphicsitem.h>
+#include <QtGui/qpalette.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Gui)
+
+class QFont;
+class QFontMetrics;
+class QGraphicsLayout;
+class QGraphicsSceneMoveEvent;
+class QGraphicsWidgetPrivate;
+class QGraphicsSceneResizeEvent;
+class QGraphicsWidgetAnimator;
+class QStyle;
+class QStyleOption;
+
+#if !defined(QT_NO_GRAPHICSVIEW) || (QT_EDITION & QT_MODULE_GRAPHICSVIEW) != QT_MODULE_GRAPHICSVIEW
+
+class QGraphicsWidgetPrivate;
+
+class Q_GUI_EXPORT QGraphicsWidget : public QObject, public QGraphicsItem, public QGraphicsLayoutItem
+{
+    Q_OBJECT
+    Q_PROPERTY(QPalette palette READ palette WRITE setPalette)
+    Q_PROPERTY(QFont font READ font WRITE setFont)
+    Q_PROPERTY(Qt::LayoutDirection layoutDirection READ layoutDirection WRITE setLayoutDirection RESET unsetLayoutDirection)
+    Q_PROPERTY(QSizeF size READ size WRITE resize)
+    Q_PROPERTY(Qt::FocusPolicy focusPolicy READ focusPolicy WRITE setFocusPolicy)
+    Q_PROPERTY(bool enabled READ isEnabled WRITE setEnabled)
+    Q_PROPERTY(bool visible READ isVisible WRITE setVisible)
+    Q_PROPERTY(Qt::WindowFlags windowFlags READ windowFlags WRITE setWindowFlags)
+    Q_PROPERTY(QString windowTitle READ windowTitle WRITE setWindowTitle)
+    Q_PROPERTY(qreal opacity READ opacity WRITE setOpacity)
+    Q_PROPERTY(QPointF pos READ pos WRITE setPos)
+    Q_PROPERTY(QRectF geometry READ geometry WRITE setGeometry)
+    Q_PROPERTY(qreal xScale READ xScale WRITE setXScale)
+    Q_PROPERTY(qreal yScale READ yScale WRITE setYScale)
+    Q_PROPERTY(qreal zRotation READ zRotation WRITE setZRotation)
+    Q_PROPERTY(qreal xRotation READ xRotation WRITE setXRotation)
+    Q_PROPERTY(qreal yRotation READ yRotation WRITE setYRotation)
+
+public:
+    QGraphicsWidget(QGraphicsItem *parent = 0, Qt::WindowFlags wFlags = 0);
+    ~QGraphicsWidget();
+
+    QGraphicsLayout *layout() const;
+    void setLayout(QGraphicsLayout *layout);
+    void adjustSize();
+
+    Qt::LayoutDirection layoutDirection() const;
+    void setLayoutDirection(Qt::LayoutDirection direction);
+    void unsetLayoutDirection();
+
+    QStyle *style() const;
+    void setStyle(QStyle *style);
+
+    QFont font() const;
+    void setFont(const QFont &font);
+
+    QPalette palette() const;
+    void setPalette(const QPalette &palette);
+
+    void resize(const QSizeF &size);
+    inline void resize(qreal w, qreal h) { resize(QSizeF(w, h)); }
+    QSizeF size() const;
+
+    void setGeometry(const QRectF &rect);
+    inline void setGeometry(qreal x, qreal y, qreal w, qreal h);
+    inline QRectF rect() const { return QRectF(QPointF(), size()); }
+
+    void setContentsMargins(qreal left, qreal top, qreal right, qreal bottom);
+    void getContentsMargins(qreal *left, qreal *top, qreal *right, qreal *bottom) const;
+
+    void setWindowFrameMargins(qreal left, qreal top, qreal right, qreal bottom);
+    void getWindowFrameMargins(qreal *left, qreal *top, qreal *right, qreal *bottom) const;
+    void unsetWindowFrameMargins();
+    QRectF windowFrameGeometry() const;
+    QRectF windowFrameRect() const;
+
+    // Window handling
+    Qt::WindowFlags windowFlags() const;
+    Qt::WindowType windowType() const;
+    void setWindowFlags(Qt::WindowFlags wFlags);
+    bool isActiveWindow() const;
+    void setWindowTitle(const QString &title);
+    QString windowTitle() const;
+
+    // Focus handling
+    Qt::FocusPolicy focusPolicy() const;
+    void setFocusPolicy(Qt::FocusPolicy policy);
+    static void setTabOrder(QGraphicsWidget *first, QGraphicsWidget *second);
+    QGraphicsWidget *focusWidget() const;
+
+#ifndef QT_NO_SHORTCUT
+    int grabShortcut(const QKeySequence &sequence, Qt::ShortcutContext context = Qt::WindowShortcut);
+    void releaseShortcut(int id);
+    void setShortcutEnabled(int id, bool enabled = true);
+    void setShortcutAutoRepeat(int id, bool enabled = true);
+#endif
+
+#ifndef QT_NO_ACTION
+    //actions
+    void addAction(QAction *action);
+    void addActions(QList<QAction*> actions);
+    void insertAction(QAction *before, QAction *action);
+    void insertActions(QAction *before, QList<QAction*> actions);
+    void removeAction(QAction *action);
+    QList<QAction*> actions() const;
+#endif
+
+    void setAttribute(Qt::WidgetAttribute attribute, bool on = true);
+    bool testAttribute(Qt::WidgetAttribute attribute) const;
+
+    enum {
+        Type = 11
+    };
+    int type() const;
+
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0);
+    virtual void paintWindowFrame(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0);
+    QRectF boundingRect() const;
+    QPainterPath shape() const;
+
+#if 0
+    void dumpFocusChain();
+#endif
+
+    // ### Qt 5: Disambiguate
+#ifdef Q_NO_USING_KEYWORD
+    const QObjectList &children() const { return QObject::children(); }
+#else
+    using QObject::children;
+#endif
+
+public Q_SLOTS:
+    bool close();
+
+protected:
+    virtual void initStyleOption(QStyleOption *option) const;
+
+    QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint = QSizeF()) const;
+    void updateGeometry();
+
+    // Notification
+    QVariant itemChange(GraphicsItemChange change, const QVariant &value);
+    virtual QVariant propertyChange(const QString &propertyName, const QVariant &value);
+
+    // Scene events
+    bool sceneEvent(QEvent *event);
+    virtual bool windowFrameEvent(QEvent *e);
+    virtual Qt::WindowFrameSection windowFrameSectionAt(const QPointF& pos) const;
+
+    // Base event handlers
+    bool event(QEvent *event);
+    //virtual void actionEvent(QActionEvent *event);
+    virtual void changeEvent(QEvent *event);
+    virtual void closeEvent(QCloseEvent *event);
+    //void create(WId window = 0, bool initializeWindow = true, bool destroyOldWindow = true);
+    //void destroy(bool destroyWindow = true, bool destroySubWindows = true);
+    void focusInEvent(QFocusEvent *event);
+    virtual bool focusNextPrevChild(bool next);
+    void focusOutEvent(QFocusEvent *event);
+    virtual void hideEvent(QHideEvent *event);
+    //virtual bool macEvent(EventHandlerCallRef caller, EventRef event);
+    //virtual int metric(PaintDeviceMetric m ) const;
+    virtual void moveEvent(QGraphicsSceneMoveEvent *event);
+    virtual void polishEvent();
+    //virtual bool qwsEvent(QWSEvent *event);
+    //void resetInputContext ();
+    virtual void resizeEvent(QGraphicsSceneResizeEvent *event);
+    virtual void showEvent(QShowEvent *event);
+    //virtual void tabletEvent(QTabletEvent *event);
+    //virtual bool winEvent(MSG *message, long *result);
+    //virtual bool x11Event(XEvent *event);
+    virtual void hoverMoveEvent(QGraphicsSceneHoverEvent *event);
+    virtual void hoverLeaveEvent(QGraphicsSceneHoverEvent *event);
+    virtual void grabMouseEvent(QEvent *event);
+    virtual void ungrabMouseEvent(QEvent *event);
+    virtual void grabKeyboardEvent(QEvent *event);
+    virtual void ungrabKeyboardEvent(QEvent *event);
+    QGraphicsWidget(QGraphicsWidgetPrivate &, QGraphicsItem *parent, QGraphicsScene *, Qt::WindowFlags wFlags = 0);
+
+private:
+    Q_DISABLE_COPY(QGraphicsWidget)
+    Q_DECLARE_PRIVATE_D(QGraphicsItem::d_ptr, QGraphicsWidget)
+    friend class QGraphicsScene;
+    friend class QGraphicsScenePrivate;
+    friend class QGraphicsView;
+    friend class QGraphicsItem;
+    friend class QGraphicsItemPrivate;
+    friend class QGraphicsLayout;
+    friend class QWidget;
+    friend class QApplication;
+};
+
+inline void QGraphicsWidget::setGeometry(qreal ax, qreal ay, qreal aw, qreal ah)
+{ setGeometry(QRectF(ax, ay, aw, ah)); }
+
+#endif
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif
+
diff --git a/src/gui/graphicsview/qgraphicswidget_p.cpp b/src/gui/graphicsview/qgraphicswidget_p.cpp
new file mode 100644
index 0000000..641409d
--- /dev/null
+++ b/src/gui/graphicsview/qgraphicswidget_p.cpp
@@ -0,0 +1,740 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qglobal.h"
+
+#ifndef QT_NO_GRAPHICSVIEW
+
+#include <QtCore/qdebug.h>
+#include "qgraphicswidget_p.h"
+#include "qgraphicslayout.h"
+#include "qgraphicsscene_p.h"
+#include <QtGui/qapplication.h>
+#include <QtGui/qgraphicsscene.h>
+#include <QtGui/qstyleoption.h>
+#include <QtGui/QStyleOptionTitleBar>
+#include <QtGui/QGraphicsSceneMouseEvent>
+#if defined(Q_WS_MAC) && !defined(QT_NO_STYLE_MAC)
+# include <QMacStyle>
+#endif
+
+QT_BEGIN_NAMESPACE
+
+void QGraphicsWidgetPrivate::init(QGraphicsItem *parentItem, Qt::WindowFlags wFlags)
+{
+    Q_Q(QGraphicsWidget);
+
+    attributes = 0;
+    isWidget = 1; // QGraphicsItem::isWidget() returns true.
+    focusNext = focusPrev = q;
+    focusPolicy = Qt::NoFocus;
+    q->setParentItem(parentItem);
+    q->setSizePolicy(QSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred, QSizePolicy::DefaultType));
+    q->setGraphicsItem(q);
+
+    resolveLayoutDirection();
+
+    if (!parentItem)
+        adjustWindowFlags(&wFlags);
+    windowFlags = wFlags;
+    q->unsetWindowFrameMargins();
+}
+qreal QGraphicsWidgetPrivate::titleBarHeight(const QStyleOptionTitleBar &options) const
+{
+    Q_Q(const QGraphicsWidget);
+    int height = q->style()->pixelMetric(QStyle::PM_TitleBarHeight, &options);
+#if defined(Q_WS_MAC) && !defined(QT_NO_STYLE_MAC)
+    if (qobject_cast<QMacStyle*>(q->style())) {
+        height -=4;
+    }
+#endif
+    return (qreal)height;
+}
+
+void QGraphicsWidgetPrivate::getLayoutItemMargins(qreal *left, qreal *top, qreal *right, qreal *bottom) const
+{
+    if (left)
+        *left = leftLayoutItemMargin;
+    if (top)
+        *top = topLayoutItemMargin;
+    if (right)
+        *right = rightLayoutItemMargin;
+    if (bottom)
+        *bottom = bottomLayoutItemMargin;
+}
+
+void QGraphicsWidgetPrivate::setLayoutItemMargins(qreal left, qreal top, qreal right, qreal bottom)
+{
+    if (leftLayoutItemMargin == left
+        && topLayoutItemMargin == top
+        && rightLayoutItemMargin == right
+        && bottomLayoutItemMargin == bottom)
+        return;
+
+    Q_Q(QGraphicsWidget);
+    leftLayoutItemMargin = left;
+    topLayoutItemMargin = top;
+    rightLayoutItemMargin = right;
+    bottomLayoutItemMargin = bottom;
+    q->updateGeometry();
+}
+
+void QGraphicsWidgetPrivate::setLayoutItemMargins(QStyle::SubElement element, const QStyleOption *opt)
+{
+    Q_Q(QGraphicsWidget);
+    QStyleOption myOpt;
+    if (!opt) {
+        q->initStyleOption(&myOpt);
+        myOpt.rect.setRect(0, 0, 32768, 32768);     // arbitrary
+        opt = &myOpt;
+    }
+
+    QRect liRect = q->style()->subElementRect(element, opt, /* q */ 0);
+    if (liRect.isValid()) {
+        leftLayoutItemMargin = (opt->rect.left() - liRect.left());
+        topLayoutItemMargin = (opt->rect.top() - liRect.top());
+        rightLayoutItemMargin = (liRect.right() - opt->rect.right());
+        bottomLayoutItemMargin = (liRect.bottom() - opt->rect.bottom());
+    } else {
+        leftLayoutItemMargin = 0;
+        topLayoutItemMargin = 0;
+        rightLayoutItemMargin = 0;
+        bottomLayoutItemMargin = 0;
+    }
+}
+
+void QGraphicsWidgetPrivate::setPalette_helper(const QPalette &palette)
+{
+    if (this->palette == palette && this->palette.resolve() == palette.resolve())
+        return;
+    updatePalette(palette);
+}
+
+void QGraphicsWidgetPrivate::resolvePalette(uint inheritedMask)
+{
+    inheritedPaletteResolveMask = inheritedMask;
+    QPalette naturalPalette = naturalWidgetPalette();
+    QPalette resolvedPalette = palette.resolve(naturalPalette);
+    updatePalette(resolvedPalette);
+}
+
+void QGraphicsWidgetPrivate::updatePalette(const QPalette &palette)
+{
+    Q_Q(QGraphicsWidget);
+    // Update local palette setting.
+    this->palette = palette;
+
+    // Calculate new mask.
+    if (q->isWindow() && !q->testAttribute(Qt::WA_WindowPropagation))
+        inheritedPaletteResolveMask = 0;
+    int mask = palette.resolve() | inheritedPaletteResolveMask;
+
+    // Propagate to children.
+    for (int i = 0; i < children.size(); ++i) {
+        QGraphicsItem *item = children.at(i);
+        if (item->isWidget()) {
+            QGraphicsWidget *w = static_cast<QGraphicsWidget *>(item);
+            if (!w->isWindow() || w->testAttribute(Qt::WA_WindowPropagation))
+                w->d_func()->resolvePalette(mask);
+        } else {
+            item->d_ptr->resolvePalette(mask);
+        }
+    }
+
+    // Notify change.
+    QEvent event(QEvent::PaletteChange);
+    QApplication::sendEvent(q, &event);
+}
+
+void QGraphicsWidgetPrivate::setLayoutDirection_helper(Qt::LayoutDirection direction)
+{
+    Q_Q(QGraphicsWidget);
+    if ((direction == Qt::RightToLeft) == (testAttribute(Qt::WA_RightToLeft)))
+        return;
+    q->setAttribute(Qt::WA_RightToLeft, (direction == Qt::RightToLeft));
+
+    // Propagate this change to all children.
+    for (int i = 0; i < children.size(); ++i) {
+        QGraphicsItem *item = children.at(i);
+        if (item->isWidget()) {
+            QGraphicsWidget *widget = static_cast<QGraphicsWidget *>(item);
+            if (widget->parentWidget() && !widget->testAttribute(Qt::WA_SetLayoutDirection))
+                widget->d_func()->setLayoutDirection_helper(direction);
+        }
+    }
+
+    // Send the notification event to this widget item.
+    QEvent e(QEvent::LayoutDirectionChange);
+    QApplication::sendEvent(q, &e);
+}
+
+void QGraphicsWidgetPrivate::resolveLayoutDirection()
+{
+    Q_Q(QGraphicsWidget);
+    if (q->testAttribute(Qt::WA_SetLayoutDirection)) {
+        return;
+    }
+    if (QGraphicsWidget *parentWidget = q->parentWidget()) {
+        setLayoutDirection_helper(parentWidget->layoutDirection());
+    } else if (scene) {
+        // ### shouldn't the scene have a layoutdirection really? how does
+        // ### QGraphicsWidget get changes from QApplication::layoutDirection?
+        setLayoutDirection_helper(QApplication::layoutDirection());
+    } else {
+        setLayoutDirection_helper(QApplication::layoutDirection());
+    }
+}
+
+QPalette QGraphicsWidgetPrivate::naturalWidgetPalette() const
+{
+    Q_Q(const QGraphicsWidget);
+    QPalette palette;
+    if (QGraphicsWidget *parent = q->parentWidget()) {
+        palette = parent->palette();
+    } else if (scene) {
+        palette = scene->palette();
+    }
+    palette.resolve(0);
+    return palette;
+}
+
+void QGraphicsWidgetPrivate::setFont_helper(const QFont &font)
+{
+    if (this->font == font && this->font.resolve() == font.resolve())
+        return;
+    updateFont(font);
+}
+
+void QGraphicsWidgetPrivate::resolveFont(uint inheritedMask)
+{
+    inheritedFontResolveMask = inheritedMask;
+    QFont naturalFont = naturalWidgetFont();
+    QFont resolvedFont = font.resolve(naturalFont);
+    updateFont(resolvedFont);
+}
+
+void QGraphicsWidgetPrivate::updateFont(const QFont &font)
+{
+    Q_Q(QGraphicsWidget);
+    // Update the local font setting.
+    this->font = font;
+
+    // Calculate new mask.
+    if (q->isWindow() && !q->testAttribute(Qt::WA_WindowPropagation))
+        inheritedFontResolveMask = 0;
+    int mask = font.resolve() | inheritedFontResolveMask;
+
+    // Propagate to children.
+    for (int i = 0; i < children.size(); ++i) {
+        QGraphicsItem *item = children.at(i);
+        if (item->isWidget()) {
+            QGraphicsWidget *w = static_cast<QGraphicsWidget *>(item);
+            if (!w->isWindow() || w->testAttribute(Qt::WA_WindowPropagation))
+                w->d_func()->resolveFont(mask);
+        } else {
+            item->d_ptr->resolveFont(mask);
+        }
+    }
+
+    // Notify change.
+    QEvent event(QEvent::FontChange);
+    QApplication::sendEvent(q, &event);
+}
+
+QFont QGraphicsWidgetPrivate::naturalWidgetFont() const
+{
+    Q_Q(const QGraphicsWidget);
+    QFont naturalFont; // ### no application font support
+    if (QGraphicsWidget *parent = q->parentWidget()) {
+        naturalFont = parent->font();
+    } else if (scene) {
+        naturalFont = scene->font();
+    }
+    naturalFont.resolve(0);
+    return naturalFont;
+}
+
+void QGraphicsWidgetPrivate::initStyleOptionTitleBar(QStyleOptionTitleBar *option)
+{
+    Q_Q(QGraphicsWidget);
+    q->initStyleOption(option);
+    option->rect.setHeight(titleBarHeight(*option));
+    option->titleBarFlags = windowFlags;
+    option->subControls = QStyle::SC_TitleBarCloseButton | QStyle::SC_TitleBarLabel | QStyle::SC_TitleBarSysMenu;
+    option->activeSubControls = hoveredSubControl;
+    bool isActive = q->isActiveWindow();
+    if (isActive) {
+        option->state |= QStyle::State_Active;
+        option->titleBarState = Qt::WindowActive;
+        option->titleBarState |= QStyle::State_Active;
+    } else {
+        option->state &= ~QStyle::State_Active;
+        option->titleBarState = Qt::WindowNoState;
+    }
+    QFont windowTitleFont = QApplication::font("QWorkspaceTitleBar");
+    QRect textRect = q->style()->subControlRect(QStyle::CC_TitleBar, option, QStyle::SC_TitleBarLabel, 0);
+    option->text = QFontMetrics(windowTitleFont).elidedText(windowTitle, Qt::ElideRight, textRect.width());
+}
+
+void QGraphicsWidgetPrivate::adjustWindowFlags(Qt::WindowFlags *flags)
+{
+    bool customize =  (*flags & (Qt::CustomizeWindowHint
+            | Qt::FramelessWindowHint
+            | Qt::WindowTitleHint
+            | Qt::WindowSystemMenuHint
+            | Qt::WindowMinimizeButtonHint
+            | Qt::WindowMaximizeButtonHint
+            | Qt::WindowContextHelpButtonHint));
+
+    uint type = (*flags & Qt::WindowType_Mask);
+    if (customize)
+        ;
+    else if (type == Qt::Dialog || type == Qt::Sheet)
+        *flags |= Qt::WindowTitleHint | Qt::WindowSystemMenuHint | Qt::WindowContextHelpButtonHint;
+    else if (type == Qt::Tool)
+        *flags |= Qt::WindowTitleHint | Qt::WindowSystemMenuHint;
+    else if (type == Qt::Window || type == Qt::SubWindow)
+        *flags |= Qt::WindowTitleHint | Qt::WindowSystemMenuHint
+                  | Qt::WindowMinimizeButtonHint | Qt::WindowMaximizeButtonHint;
+}
+
+void QGraphicsWidgetPrivate::windowFrameMouseReleaseEvent(QGraphicsSceneMouseEvent *event)
+{
+    Q_Q(QGraphicsWidget);
+    if (grabbedSection != Qt::NoSection) {
+        if (grabbedSection == Qt::TitleBarArea) {
+            buttonSunken = false;
+            QStyleOptionTitleBar bar;
+            initStyleOptionTitleBar(&bar);
+            // make sure that the coordinates (rect and pos) we send to the style are positive.
+            bar.rect = q->windowFrameRect().toRect();
+            bar.rect.moveTo(0,0);
+            bar.rect.setHeight(q->style()->pixelMetric(QStyle::PM_TitleBarHeight, &bar));
+            QPointF pos = event->pos();
+            pos.rx() += leftWindowFrameMargin;
+            pos.ry() += topWindowFrameMargin;
+            bar.subControls = QStyle::SC_TitleBarCloseButton;
+            if (q->style()->subControlRect(QStyle::CC_TitleBar, &bar,
+                                           QStyle::SC_TitleBarCloseButton,
+                                           event->widget()).contains(pos.toPoint())) {
+                q->close();
+            }
+        }
+        if (!(static_cast<QGraphicsSceneMouseEvent *>(event)->buttons()))
+            grabbedSection = Qt::NoSection;
+        event->accept();
+    }
+}
+
+void QGraphicsWidgetPrivate::windowFrameMousePressEvent(QGraphicsSceneMouseEvent *event)
+{
+    Q_Q(QGraphicsWidget);
+    if (event->button() != Qt::LeftButton)
+        return;
+
+    startGeometry = q->geometry();
+    grabbedSection = q->windowFrameSectionAt(event->pos());
+    switch (grabbedSection) {
+    case Qt::LeftSection:
+    case Qt::TopLeftSection:
+        mouseDelta = event->pos() - q->rect().topLeft();
+        break;
+    case Qt::TopSection:
+    case Qt::TopRightSection:
+        mouseDelta = event->pos() - q->rect().topRight();
+        break;
+    case Qt::RightSection:
+    case Qt::BottomRightSection:
+        mouseDelta = event->pos() - q->rect().bottomRight();
+        break;
+    case Qt::BottomSection:
+    case Qt::BottomLeftSection:
+        mouseDelta = event->pos() - q->rect().bottomLeft();
+        break;
+    case Qt::TitleBarArea:
+        if (hoveredSubControl == QStyle::SC_TitleBarCloseButton) {
+            buttonSunken = true;
+            q->update();
+        }
+        break;
+    case Qt::NoSection:
+        break;
+    }
+    event->setAccepted(grabbedSection != Qt::NoSection);
+}
+
+static void _q_boundGeometryToSizeConstraints(const QRectF &startGeometry,
+                                              QRectF *rect, Qt::WindowFrameSection section,
+                                              const QSizeF &min, const QSizeF &max)
+{
+    int height;
+    int width;
+    switch (section) {
+    case Qt::LeftSection:
+        width = qRound(qBound(min.width(), rect->width(), max.width()));
+        rect->setRect(startGeometry.right() - width, startGeometry.top(),
+                      width, startGeometry.height());
+        break;
+    case Qt::TopLeftSection:
+        width = qRound(qBound(min.width(), rect->width(), max.width()));
+        height = qRound(qBound(min.height(), rect->height(), max.height()));
+        rect->setRect(startGeometry.right() - width, startGeometry.bottom() - height,
+                      width, height);
+        break;
+    case Qt::TopSection:
+        height = qRound(qBound(min.height(), rect->height(), max.height()));
+        rect->setRect(startGeometry.left(), startGeometry.bottom() - height,
+                      startGeometry.width(), height);
+        break;
+    case Qt::TopRightSection:
+        height = qRound(qBound(min.height(), rect->height(), max.height()));
+        rect->setTop(rect->bottom() - height);
+        rect->setWidth(qBound(min.width(), rect->width(), max.width()));
+        break;
+    case Qt::RightSection:
+        rect->setWidth(qBound(min.width(), rect->width(), max.width()));
+        break;
+    case Qt::BottomRightSection:
+        rect->setWidth(qBound(min.width(), rect->width(), max.width()));
+        rect->setHeight(qBound(min.height(), rect->height(), max.height()));
+        break;
+    case Qt::BottomSection:
+        rect->setHeight(qBound(min.height(), rect->height(), max.height()));
+        break;
+    case Qt::BottomLeftSection:
+        height = qRound(qBound(min.height(), rect->height(), max.height()));
+        width = qRound(qBound(min.width(), rect->width(), max.width()));
+        rect->setRect(startGeometry.right() - width, startGeometry.top(),
+                      width, height);
+        break;
+    default:
+        break;
+    }
+}
+
+void QGraphicsWidgetPrivate::windowFrameMouseMoveEvent(QGraphicsSceneMouseEvent *event)
+{
+    Q_Q(QGraphicsWidget);
+    if (!(event->buttons() & Qt::LeftButton) || hoveredSubControl != QStyle::SC_TitleBarLabel)
+        return;
+
+    QLineF delta(q->mapFromScene(event->buttonDownScenePos(Qt::LeftButton)), event->pos());
+    QLineF parentDelta(q->mapToParent(delta.p1()), q->mapToParent(delta.p2()));
+    QLineF parentXDelta(q->mapToParent(QPointF(delta.p1().x(), 0)), q->mapToParent(QPointF(delta.p2().x(), 0)));
+    QLineF parentYDelta(q->mapToParent(QPointF(0, delta.p1().y())), q->mapToParent(QPointF(0, delta.p2().y())));
+
+    QRectF newGeometry;
+    switch (grabbedSection) {
+    case Qt::LeftSection:
+        newGeometry = QRectF(startGeometry.topLeft() + QPointF(parentXDelta.dx(), parentXDelta.dy()),
+                             startGeometry.size() - QSizeF(delta.dx(), delta.dy()));
+        break;
+    case Qt::TopLeftSection:
+        newGeometry = QRectF(startGeometry.topLeft() + QPointF(parentDelta.dx(), parentDelta.dy()),
+                             startGeometry.size() - QSizeF(delta.dx(), delta.dy()));
+        break;
+    case Qt::TopSection:
+        newGeometry = QRectF(startGeometry.topLeft() + QPointF(parentYDelta.dx(), parentYDelta.dy()),
+                             startGeometry.size() - QSizeF(0, delta.dy()));
+        break;
+    case Qt::TopRightSection:
+        newGeometry = QRectF(startGeometry.topLeft() + QPointF(parentYDelta.dx(), parentYDelta.dy()),
+                             startGeometry.size() - QSizeF(-delta.dx(), delta.dy()));
+        break;
+    case Qt::RightSection:
+        newGeometry = QRectF(startGeometry.topLeft(),
+                             startGeometry.size() + QSizeF(delta.dx(), 0));
+        break;
+    case Qt::BottomRightSection:
+        newGeometry = QRectF(startGeometry.topLeft(),
+                             startGeometry.size() + QSizeF(delta.dx(), delta.dy()));
+        break;
+    case Qt::BottomSection:
+        newGeometry = QRectF(startGeometry.topLeft(),
+                             startGeometry.size() + QSizeF(0, delta.dy()));
+        break;
+    case Qt::BottomLeftSection:
+        newGeometry = QRectF(startGeometry.topLeft() + QPointF(parentXDelta.dx(), parentXDelta.dy()),
+                             startGeometry.size() - QSizeF(delta.dx(), -delta.dy()));
+        break;
+    case Qt::TitleBarArea:
+        newGeometry = QRectF(startGeometry.topLeft() + QPointF(parentDelta.dx(), parentDelta.dy()),
+                             startGeometry.size());
+        break;
+    case Qt::NoSection:
+        break;
+    }
+
+    if (grabbedSection != Qt::NoSection) {
+        _q_boundGeometryToSizeConstraints(startGeometry, &newGeometry, grabbedSection,
+                                          q->effectiveSizeHint(Qt::MinimumSize),
+                                          q->effectiveSizeHint(Qt::MaximumSize));
+        q->setGeometry(newGeometry);
+    }
+}
+
+void QGraphicsWidgetPrivate::windowFrameHoverMoveEvent(QGraphicsSceneHoverEvent *event)
+{
+    Q_Q(QGraphicsWidget);
+    if (!hasDecoration())
+        return;
+
+    if (q->rect().contains(event->pos())) {
+        if (buttonMouseOver || hoveredSubControl != QStyle::SC_None)
+            windowFrameHoverLeaveEvent(event);
+        return;
+    }
+
+    bool wasMouseOver = buttonMouseOver;
+    QRect oldButtonRect = buttonRect;
+    buttonRect = QRect();
+    buttonMouseOver = false;
+    QPointF pos = event->pos();
+    QStyleOptionTitleBar bar;
+    // make sure that the coordinates (rect and pos) we send to the style are positive.
+    pos.rx() += leftWindowFrameMargin;
+    pos.ry() += topWindowFrameMargin;
+    initStyleOptionTitleBar(&bar);
+    bar.rect = q->windowFrameRect().toRect();
+    bar.rect.moveTo(0,0);
+    bar.rect.setHeight(int(titleBarHeight(bar)));
+
+    Qt::CursorShape cursorShape = Qt::ArrowCursor;
+    bool needsSetCursorCall = true;
+    switch (q->windowFrameSectionAt(event->pos())) {
+        case Qt::TopLeftSection:
+        case Qt::BottomRightSection:
+            cursorShape = Qt::SizeFDiagCursor;
+            break;
+        case Qt::TopRightSection:
+        case Qt::BottomLeftSection:
+            cursorShape = Qt::SizeBDiagCursor;
+            break;
+        case Qt::LeftSection:
+        case Qt::RightSection:
+            cursorShape = Qt::SizeHorCursor;
+            break;
+        case Qt::TopSection:
+        case Qt::BottomSection:
+            cursorShape = Qt::SizeVerCursor;
+            break;
+        case Qt::TitleBarArea:
+            buttonRect = q->style()->subControlRect(QStyle::CC_TitleBar, &bar, QStyle::SC_TitleBarCloseButton, 0);
+#ifdef Q_WS_MAC
+            // On mac we should hover if we are in the 'area' of the buttons
+            buttonRect |= q->style()->subControlRect(QStyle::CC_TitleBar, &bar, QStyle::SC_TitleBarMinButton, 0);
+            buttonRect |= q->style()->subControlRect(QStyle::CC_TitleBar, &bar, QStyle::SC_TitleBarMaxButton, 0);
+#endif
+            if (buttonRect.contains(pos.toPoint()))
+                buttonMouseOver = true;
+            event->ignore();
+            break;
+        default:
+            needsSetCursorCall = false;
+            event->ignore();
+        }
+#ifndef QT_NO_CURSOR
+    if (needsSetCursorCall)
+        q->setCursor(cursorShape);
+#endif
+    // update buttons if we hover over them
+    hoveredSubControl = q->style()->hitTestComplexControl(QStyle::CC_TitleBar, &bar, pos.toPoint(), 0);
+    if (hoveredSubControl != QStyle::SC_TitleBarCloseButton)
+        hoveredSubControl = QStyle::SC_TitleBarLabel;
+
+    if (buttonMouseOver != wasMouseOver) {
+        if (!oldButtonRect.isNull())
+            q->update(QRectF(oldButtonRect).translated(q->windowFrameRect().topLeft()));
+        if (!buttonRect.isNull())
+            q->update(QRectF(buttonRect).translated(q->windowFrameRect().topLeft()));
+    }
+}
+
+void QGraphicsWidgetPrivate::windowFrameHoverLeaveEvent(QGraphicsSceneHoverEvent *event)
+{
+    Q_UNUSED(event);
+    Q_Q(QGraphicsWidget);
+    if (hasDecoration()) {
+        // ### restore the cursor, don't override it
+#ifndef QT_NO_CURSOR
+        q->unsetCursor();
+#endif
+
+        bool needsUpdate = false;
+        if (hoveredSubControl == QStyle::SC_TitleBarCloseButton || buttonMouseOver)
+            needsUpdate = true;
+
+        // update the hover state (of buttons etc...)
+        hoveredSubControl = QStyle::SC_None;
+        buttonMouseOver = false;
+        buttonRect = QRect();
+        if (needsUpdate)
+            q->update(buttonRect);
+    }
+}
+
+bool QGraphicsWidgetPrivate::hasDecoration() const
+{
+    return (windowFlags & Qt::Window) && (windowFlags & Qt::WindowTitleHint);
+}
+
+/*!
+    \internal
+*/
+void QGraphicsWidgetPrivate::setFocusWidget()
+{
+    // Update focus child chain.
+    QGraphicsWidget *widget = static_cast<QGraphicsWidget *>(q_ptr);
+    QGraphicsWidget *parent = widget;
+    bool hidden = !visible;
+    do {
+        parent->d_func()->focusChild = widget;
+    } while (!parent->isWindow() && (parent = parent->parentWidget()) && (!hidden || !parent->d_func()->visible));
+}
+
+/*!
+    \internal
+*/
+void QGraphicsWidgetPrivate::clearFocusWidget()
+{
+    // Reset focus child chain.
+    QGraphicsWidget *parent = static_cast<QGraphicsWidget *>(q_ptr);
+    do {
+        if (parent->d_func()->focusChild != q_ptr)
+            break;
+        parent->d_func()->focusChild = 0;
+    } while (!parent->isWindow() && (parent = parent->parentWidget()));
+}
+
+/**
+ * is called after a reparent has taken place to fix up the focus chain(s)
+ */
+void QGraphicsWidgetPrivate::fixFocusChainBeforeReparenting(QGraphicsWidget *newParent, QGraphicsScene *newScene)
+{
+    Q_Q(QGraphicsWidget);
+
+    Q_ASSERT(focusNext && focusPrev);
+
+    QGraphicsWidget *n = q;     //last one in 'new' list
+    QGraphicsWidget *o = 0;     //last one in 'old' list
+
+    QGraphicsWidget *w = focusNext;
+
+    QGraphicsWidget *firstOld = 0;
+    bool wasPreviousNew = true;
+
+    if (focusChild) {
+        // Ensure that the current focus child doesn't leave pointers around
+        // before reparenting.
+        focusChild->clearFocus();
+    }
+    
+    while (w != q) {
+        bool isCurrentNew = q->isAncestorOf(w);
+        if (isCurrentNew) {
+            if (!wasPreviousNew) {
+                n->d_func()->focusNext = w;
+                w->d_func()->focusPrev = n;
+            }
+            n = w;
+        } else /*if (!isCurrentNew)*/ {
+            if (wasPreviousNew) {
+                if (o) {
+                    o->d_func()->focusNext = w;
+                    w->d_func()->focusPrev = o;
+                } else {
+                    firstOld = w;
+                }
+            }
+            o = w;
+        }
+        w = w->d_func()->focusNext;
+        wasPreviousNew = isCurrentNew;
+    }
+
+    // repair the 'old' chain
+    if (firstOld) {
+        o->d_func()->focusNext = firstOld;
+        firstOld->d_func()->focusPrev = o;
+    }
+
+    // update tabFocusFirst for oldScene if the item is going to be removed from oldScene
+    if (newParent)
+        newScene = newParent->scene();
+    QGraphicsScene *oldScene = q->scene();
+    if (oldScene && newScene != oldScene)
+        oldScene->d_func()->tabFocusFirst = firstOld;
+
+    QGraphicsItem *topLevelItem = newParent ? newParent->topLevelItem() : 0;
+    QGraphicsWidget *topLevel = 0;
+    if (topLevelItem && topLevelItem->isWidget())
+        topLevel = static_cast<QGraphicsWidget *>(topLevelItem);
+
+    if (topLevel && newParent) {
+        QGraphicsWidget *last = topLevel->d_func()->focusPrev;
+        // link last with new chain
+        last->d_func()->focusNext = q;
+        focusPrev = last;
+
+        // link last in chain with
+        topLevel->d_func()->focusPrev = n;
+        n->d_func()->focusNext = topLevel;
+    } else {
+        // q is the start of the focus chain
+        n->d_func()->focusNext = q;
+        focusPrev = n;
+    }
+
+}
+
+void QGraphicsWidgetPrivate::setLayout_helper(QGraphicsLayout *l)
+{
+    delete (this->layout);
+    layout = l;
+    if (!l) {
+        Q_Q(QGraphicsWidget);
+        q->updateGeometry();
+    }
+}
+
+QT_END_NAMESPACE
+
+#endif //QT_NO_GRAPHICSVIEW
diff --git a/src/gui/graphicsview/qgraphicswidget_p.h b/src/gui/graphicsview/qgraphicswidget_p.h
new file mode 100644
index 0000000..afa6812
--- /dev/null
+++ b/src/gui/graphicsview/qgraphicswidget_p.h
@@ -0,0 +1,232 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QGRAPHICSWIDGET_P_H
+#define QGRAPHICSWIDGET_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of qapplication_*.cpp, qwidget*.cpp and qfiledialog.cpp.  This header
+// file may change from version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <private/qobject_p.h>
+#include "qgraphicsitem_p.h"
+#include "qgraphicswidget.h"
+#include <QtGui/qfont.h>
+#include <QtGui/qpalette.h>
+#include <QtGui/qsizepolicy.h>
+#include <QtGui/qstyle.h>
+
+QT_BEGIN_NAMESPACE
+
+class QGraphicsLayout;
+class QStyleOptionTitleBar;
+
+#if !defined(QT_NO_GRAPHICSVIEW) || (QT_EDITION & QT_MODULE_GRAPHICSVIEW) != QT_MODULE_GRAPHICSVIEW
+
+class Q_GUI_EXPORT QGraphicsWidgetPrivate : public QGraphicsItemPrivate
+{
+    Q_DECLARE_PUBLIC(QGraphicsWidget)
+public:
+    QGraphicsWidgetPrivate()
+        : leftMargin(0),
+          topMargin(0),
+          rightMargin(0),
+          bottomMargin(0),
+          leftLayoutItemMargin(0),
+          topLayoutItemMargin(0),
+          rightLayoutItemMargin(0),
+          bottomLayoutItemMargin(0),
+          layout(0),
+          inheritedPaletteResolveMask(0),
+          inheritedFontResolveMask(0),
+          inSetGeometry(0),
+          focusPolicy(Qt::NoFocus),
+          focusNext(0),
+          focusPrev(0),
+          focusChild(0),
+          windowFlags(0),
+          hoveredSubControl(QStyle::SC_None),
+          grabbedSection(Qt::NoSection),
+          buttonMouseOver(false),
+          buttonSunken(false),
+          setWindowFrameMargins(false),
+          leftWindowFrameMargin(0),
+          topWindowFrameMargin(0),
+          rightWindowFrameMargin(0),
+          bottomWindowFrameMargin(0)
+    { }
+
+    void init(QGraphicsItem *parentItem, Qt::WindowFlags wFlags);
+    qreal titleBarHeight(const QStyleOptionTitleBar &options) const;
+
+    // Margins
+    qreal leftMargin;
+    qreal topMargin;
+    qreal rightMargin;
+    qreal bottomMargin;
+    QRectF contentsRect;
+
+    // Layout item margins
+    void getLayoutItemMargins(qreal *left, qreal *top, qreal *right, qreal *bottom) const;
+    void setLayoutItemMargins(qreal left, qreal top, qreal right, qreal bottom);
+    void setLayoutItemMargins(QStyle::SubElement element, const QStyleOption *opt = 0);
+
+    void fixFocusChainBeforeReparenting(QGraphicsWidget *newParent, QGraphicsScene *newScene = 0);
+    void setLayout_helper(QGraphicsLayout *l);
+
+    qreal leftLayoutItemMargin;
+    qreal topLayoutItemMargin;
+    qreal rightLayoutItemMargin;
+    qreal bottomLayoutItemMargin;
+
+    // Layouts
+    QGraphicsLayout *layout;
+    void setLayoutDirection_helper(Qt::LayoutDirection direction);
+    void resolveLayoutDirection();
+
+    // Style
+    QPalette palette;
+    uint inheritedPaletteResolveMask;
+    void setPalette_helper(const QPalette &palette);
+    void resolvePalette(uint inheritedMask);
+    void updatePalette(const QPalette &palette);
+    QPalette naturalWidgetPalette() const;
+    QFont font;
+    uint inheritedFontResolveMask;
+    void setFont_helper(const QFont &font);
+    void resolveFont(uint inheritedMask);
+    void updateFont(const QFont &font);
+    QFont naturalWidgetFont() const;
+
+    // Window specific
+    void initStyleOptionTitleBar(QStyleOptionTitleBar *option);
+    void adjustWindowFlags(Qt::WindowFlags *wFlags);
+    void windowFrameMouseReleaseEvent(QGraphicsSceneMouseEvent *event);
+    void windowFrameMousePressEvent(QGraphicsSceneMouseEvent *event);
+    void windowFrameMouseMoveEvent(QGraphicsSceneMouseEvent *event);
+    void windowFrameHoverMoveEvent(QGraphicsSceneHoverEvent *event);
+    void windowFrameHoverLeaveEvent(QGraphicsSceneHoverEvent *event);
+    bool hasDecoration() const;
+
+    // State
+    inline int attributeToBitIndex(Qt::WidgetAttribute att) const
+    {
+        int bit = -1;
+        switch (att) {
+        case Qt::WA_SetLayoutDirection: bit = 0; break;
+        case Qt::WA_RightToLeft: bit = 1; break;
+        case Qt::WA_SetStyle: bit = 2; break;
+        case Qt::WA_Resized: bit = 3; break;
+        case Qt::WA_DeleteOnClose: bit = 4; break;
+        case Qt::WA_NoSystemBackground: bit = 5; break;
+        case Qt::WA_OpaquePaintEvent: bit = 6; break;
+        case Qt::WA_SetPalette: bit = 7; break;
+        case Qt::WA_SetFont: bit = 8; break;
+        case Qt::WA_WindowPropagation: bit = 9; break;
+        default: break;
+        }
+        return bit;
+    }
+    inline void setAttribute(Qt::WidgetAttribute att, bool value)
+    {
+        int bit = attributeToBitIndex(att);
+        if (bit == -1) {
+            qWarning("QGraphicsWidget::setAttribute: unsupported attribute %d", int(att));
+            return;
+        }
+        if (value)
+            attributes |= (1 << bit);
+        else
+            attributes &= ~(1 << bit);
+    }
+    inline bool testAttribute(Qt::WidgetAttribute att) const
+    {
+        int bit = attributeToBitIndex(att);
+        if (bit == -1)
+            return false;
+        return (attributes & (1 << bit)) != 0;
+    }
+    quint32 attributes : 10;
+    quint32 inSetGeometry : 1;
+
+    // Focus
+    Qt::FocusPolicy focusPolicy;
+    QGraphicsWidget *focusNext;
+    QGraphicsWidget *focusPrev;
+    QGraphicsWidget *focusChild;
+    void setFocusWidget();
+    void clearFocusWidget();
+
+    // Windows
+    Qt::WindowFlags windowFlags;
+    QString windowTitle;
+    QStyle::SubControl hoveredSubControl;
+    Qt::WindowFrameSection grabbedSection;
+    uint buttonMouseOver : 1;
+    uint buttonSunken : 1;
+    QPointF mouseDelta; // to compensate for small error when interactively resizing
+    QRectF startGeometry;
+    QRect buttonRect;
+
+    bool setWindowFrameMargins;
+    qreal leftWindowFrameMargin;
+    qreal topWindowFrameMargin;
+    qreal rightWindowFrameMargin;
+    qreal bottomWindowFrameMargin;
+
+#ifndef QT_NO_ACTION
+    QList<QAction *> actions;
+#endif
+};
+
+#endif //!defined(QT_NO_GRAPHICSVIEW) || (QT_EDITION & QT_MODULE_GRAPHICSVIEW) != QT_MODULE_GRAPHICSVIEW
+
+QT_END_NAMESPACE
+
+#endif //QGRAPHICSWIDGET_P_H
+
diff --git a/src/gui/graphicsview/qgridlayoutengine.cpp b/src/gui/graphicsview/qgridlayoutengine.cpp
new file mode 100644
index 0000000..dc5ca21
--- /dev/null
+++ b/src/gui/graphicsview/qgridlayoutengine.cpp
@@ -0,0 +1,1542 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qglobal.h"
+
+#ifndef QT_NO_GRAPHICSVIEW
+
+#include <math.h>
+
+#include "qgraphicslayoutitem.h"
+#include "qgridlayoutengine_p.h"
+#include "qstyleoption.h"
+#include "qvarlengtharray.h"
+
+#include <QtDebug>
+
+QT_BEGIN_NAMESPACE
+
+template <typename T>
+static void insertOrRemoveItems(QVector<T> &items, int index, int delta)
+{
+    int count = items.count();
+    if (index < count) {
+        if (delta > 0) {
+            items.insert(index, delta, T());
+        } else if (delta < 0) {
+            items.remove(index, qMin(-delta, count - index));
+        }
+    }
+}
+
+static qreal growthFactorBelowPreferredSize(qreal desired, qreal sumAvailable, qreal sumDesired)
+{
+    Q_ASSERT(sumDesired != 0.0);
+    return desired * ::pow(sumAvailable / sumDesired, desired / sumDesired);
+}
+
+static qreal fixedDescent(qreal descent, qreal ascent, qreal targetSize)
+{
+    if (descent < 0.0)
+        return -1.0;
+
+    Q_ASSERT(descent >= 0.0);
+    Q_ASSERT(ascent >= 0.0);
+    Q_ASSERT(targetSize >= ascent + descent);
+
+    qreal extra = targetSize - (ascent + descent);
+    return descent + (extra / 2.0);
+}
+
+static qreal compare(const QGridLayoutBox &box1, const QGridLayoutBox &box2, int which)
+{
+    qreal size1 = box1.q_sizes(which);
+    qreal size2 = box2.q_sizes(which);
+
+    if (which == MaximumSize) {
+        return size2 - size1;
+    } else {
+        return size1 - size2;
+    }
+}
+
+void QGridLayoutBox::add(const QGridLayoutBox &other, int stretch, qreal spacing)
+{
+    Q_ASSERT(q_minimumDescent < 0.0);
+
+    q_minimumSize += other.q_minimumSize + spacing;
+    q_preferredSize += other.q_preferredSize + spacing;
+    q_maximumSize += ((stretch == 0) ? other.q_preferredSize : other.q_maximumSize) + spacing;
+}
+
+void QGridLayoutBox::combine(const QGridLayoutBox &other)
+{
+    q_minimumDescent = qMax(q_minimumDescent, other.q_minimumDescent);
+    q_minimumAscent = qMax(q_minimumAscent, other.q_minimumAscent);
+
+    q_minimumSize = qMax(q_minimumAscent + q_minimumDescent,
+                         qMax(q_minimumSize, other.q_minimumSize));
+    qreal maxMax;
+    if (q_maximumSize == FLT_MAX && other.q_maximumSize != FLT_MAX)
+        maxMax = other.q_maximumSize;
+    else if (other.q_maximumSize == FLT_MAX && q_maximumSize != FLT_MAX)
+        maxMax = q_maximumSize;
+    else
+        maxMax = qMax(q_maximumSize, other.q_maximumSize);
+
+    q_maximumSize = qMax(q_minimumSize, maxMax);
+    q_preferredSize = qBound(q_minimumSize, qMax(q_preferredSize, other.q_preferredSize),
+                             q_maximumSize);
+}
+
+void QGridLayoutBox::normalize()
+{
+    q_maximumSize = qMax(qreal(0.0), q_maximumSize);
+    q_minimumSize = qBound(qreal(0.0), q_minimumSize, q_maximumSize);
+    q_preferredSize = qBound(q_minimumSize, q_preferredSize, q_maximumSize);
+    q_minimumDescent = qMin(q_minimumDescent, q_minimumSize);
+
+    Q_ASSERT((q_minimumDescent < 0.0) == (q_minimumAscent < 0.0));
+}
+
+#ifdef QT_DEBUG
+void QGridLayoutBox::dump(int indent) const
+{
+    qDebug("%*sBox (%g <= %g <= %g [%g/%g])", indent, "", q_minimumSize, q_preferredSize,
+           q_maximumSize, q_minimumAscent, q_minimumDescent);
+}
+#endif
+
+bool operator==(const QGridLayoutBox &box1, const QGridLayoutBox &box2)
+{
+    for (int i = 0; i < NSizes; ++i) {
+        if (box1.q_sizes(i) != box2.q_sizes(i))
+            return false;
+    }
+    return box1.q_minimumDescent == box2.q_minimumDescent
+           && box1.q_minimumAscent == box2.q_minimumAscent;
+}
+
+void QGridLayoutRowData::reset(int count)
+{
+    ignore.fill(false, count);
+    boxes.fill(QGridLayoutBox(), count);
+    multiCellMap.clear();
+    stretches.fill(0, count);
+    spacings.fill(0.0, count);
+    hasIgnoreFlag = false;
+}
+
+void QGridLayoutRowData::distributeMultiCells()
+{
+    MultiCellMap::const_iterator i = multiCellMap.constBegin();
+    for (; i != multiCellMap.constEnd(); ++i) {
+        int start = i.key().first;
+        int span = i.key().second;
+        int end = start + span;
+        const QGridLayoutBox &box = i.value().q_box;
+        int stretch = i.value().q_stretch;
+
+        QGridLayoutBox totalBox = this->totalBox(start, end);
+        QVarLengthArray<QGridLayoutBox> extras(span);
+        QVarLengthArray<qreal> dummy(span);
+        QVarLengthArray<qreal> newSizes(span);
+
+        for (int j = 0; j < NSizes; ++j) {
+            qreal extra = compare(totalBox, box, j);
+            if (extra > 0.0) {
+                calculateGeometries(start, end, totalBox.q_sizes(j), dummy.data(), newSizes.data(),
+                                    0, totalBox);
+
+                for (int k = 0; k < span; ++k)
+                    extras[k].q_sizes(j) = newSizes[k];
+            }
+        }
+
+        for (int k = 0; k < span; ++k) {
+            boxes[start + k].combine(extras[k]);
+            stretches[start + k] = qMax(stretches[start + k], stretch);
+        }
+    }
+    multiCellMap.clear();
+}
+
+void QGridLayoutRowData::calculateGeometries(int start, int end, qreal targetSize, qreal *positions,
+                                             qreal *sizes, qreal *descents,
+                                             const QGridLayoutBox &totalBox)
+{
+    Q_ASSERT(end > start);
+
+    targetSize = qBound(totalBox.q_minimumSize, targetSize, totalBox.q_maximumSize);
+
+    int n = end - start;
+    QVarLengthArray<qreal> newSizes(n);
+    QVarLengthArray<qreal> factors(n);
+    qreal sumFactors = 0.0;
+    int sumStretches = 0;
+    qreal sumAvailable;
+
+    for (int i = 0; i < n; ++i) {
+        if (stretches[start + i] > 0)
+            sumStretches += stretches[start + i];
+    }
+
+    if (targetSize < totalBox.q_preferredSize) {
+        stealBox(start, end, MinimumSize, positions, sizes);
+
+        sumAvailable = targetSize - totalBox.q_minimumSize;
+        if (sumAvailable > 0.0) {
+            qreal sumDesired = totalBox.q_preferredSize - totalBox.q_minimumSize;
+
+            for (int i = 0; i < n; ++i) {
+                if (ignore.testBit(start + i)) {
+                    factors[i] = 0.0;
+                    continue;
+                }
+
+                const QGridLayoutBox &box = boxes.at(start + i);
+                qreal desired = box.q_preferredSize - box.q_minimumSize;
+                factors[i] = growthFactorBelowPreferredSize(desired, sumAvailable, sumDesired);
+                sumFactors += factors[i];
+            }
+
+            for (int i = 0; i < n; ++i) {
+                Q_ASSERT(sumFactors > 0.0);
+                qreal delta = sumAvailable * factors[i] / sumFactors;
+                newSizes[i] = sizes[i] + delta;
+            }
+        }
+    } else {
+        stealBox(start, end, PreferredSize, positions, sizes);
+
+        sumAvailable = targetSize - totalBox.q_preferredSize;
+        if (sumAvailable > 0.0) {
+            bool somethingHasAMaximumSize = false;
+
+            qreal sumPreferredSizes = 0.0;
+            for (int i = 0; i < n; ++i)
+                sumPreferredSizes += sizes[i];
+
+            for (int i = 0; i < n; ++i) {
+                if (ignore.testBit(start + i)) {
+                    newSizes[i] = 0.0;
+                    factors[i] = 0.0;
+                    continue;
+                }
+
+                const QGridLayoutBox &box = boxes.at(start + i);
+                qreal desired = box.q_maximumSize - box.q_preferredSize;
+                if (desired == 0.0) {
+                    newSizes[i] = sizes[i];
+                    factors[i] = 0.0;
+                } else {
+                    Q_ASSERT(desired > 0.0);
+
+                    int stretch = stretches[start + i];
+                    if (sumStretches == 0) {
+                        if (hasIgnoreFlag) {
+                            factors[i] = (stretch < 0) ? 1.0 : 0.0;
+                        } else {
+                            factors[i] = (stretch < 0) ? sizes[i] : 0.0;                        
+                        }
+                    } else if (stretch == sumStretches) {
+                        factors[i] = 1.0;
+                    } else if (stretch <= 0) {
+                        factors[i] = 0.0;
+                    } else {
+                        qreal ultimatePreferredSize;
+                        qreal ultimateSumPreferredSizes;
+                        qreal x = ((stretch * sumPreferredSizes)
+                                   - (sumStretches * box.q_preferredSize))
+                                  / (sumStretches - stretch);
+                        if (x >= 0.0) {
+                            ultimatePreferredSize = box.q_preferredSize + x;
+                            ultimateSumPreferredSizes = sumPreferredSizes + x;
+                        } else {
+                            ultimatePreferredSize = box.q_preferredSize;
+                            ultimateSumPreferredSizes = (sumStretches * box.q_preferredSize)
+                                                        / stretch;
+                        }
+
+                        /*
+                            We multiply these by 1.5 to give some space for a smooth transition
+                            (at the expense of the stretch factors, which are not fully respected
+                            during the transition).
+                        */
+                        ultimatePreferredSize = ultimatePreferredSize * 3 / 2;
+                        ultimateSumPreferredSizes = ultimateSumPreferredSizes * 3 / 2;
+
+                        qreal ultimateFactor = (stretch * ultimateSumPreferredSizes
+                                                / sumStretches)
+                                               - (box.q_preferredSize);
+                        qreal transitionalFactor = sumAvailable
+                                                   * (ultimatePreferredSize - box.q_preferredSize)
+                                                   / (ultimateSumPreferredSizes
+                                                      - sumPreferredSizes);
+
+                        qreal alpha = qMin(sumAvailable,
+                                           ultimateSumPreferredSizes - sumPreferredSizes);
+                        qreal beta = ultimateSumPreferredSizes - sumPreferredSizes;
+
+                        factors[i] = ((alpha * ultimateFactor)
+                                      + ((beta - alpha) * transitionalFactor)) / beta;
+                    }
+                    sumFactors += factors[i];
+                    if (desired < sumAvailable)
+                        somethingHasAMaximumSize = true;
+
+                    newSizes[i] = -1.0;
+                }
+            }
+
+            bool keepGoing = somethingHasAMaximumSize;
+            while (keepGoing) {
+                keepGoing = false;
+
+                for (int i = 0; i < n; ++i) {
+                    if (newSizes[i] >= 0.0)
+                        continue;
+
+                    const QGridLayoutBox &box = boxes.at(start + i);
+                    qreal avail = sumAvailable * factors[i] / sumFactors;
+                    if (sizes[i] + avail >= box.q_maximumSize) {
+                        newSizes[i] = box.q_maximumSize;
+                        sumAvailable -= box.q_maximumSize - sizes[i];
+                        sumFactors -= factors[i];
+                        keepGoing = (sumAvailable > 0.0);
+                        if (!keepGoing)
+                            break;
+                    }
+                }
+            }
+
+            for (int i = 0; i < n; ++i) {
+                if (newSizes[i] < 0.0) {
+                    qreal delta = (sumFactors == 0.0) ? 0.0
+                                                      : sumAvailable * factors[i] / sumFactors;
+                    newSizes[i] = sizes[i] + delta;
+                }
+            }
+        }
+    }
+
+    if (sumAvailable > 0) {
+        qreal offset = 0;
+        for (int i = 0; i < n; ++i) {
+            qreal delta = newSizes[i] - sizes[i];
+            positions[i] += offset;
+            sizes[i] += delta;
+            offset += delta;
+        }
+
+#if 0 // some "pixel allocation"
+        int surplus = targetSize - (positions[n - 1] + sizes[n - 1]);
+        Q_ASSERT(surplus >= 0 && surplus <= n);
+
+        int prevSurplus = -1;
+        while (surplus > 0 && surplus != prevSurplus) {
+            prevSurplus = surplus;
+
+            int offset = 0;
+            for (int i = 0; i < n; ++i) {
+                const QGridLayoutBox &box = boxes.at(start + i);
+                int delta = (!ignore.testBit(start + i) && surplus > 0
+                             && factors[i] > 0 && sizes[i] < box.q_maximumSize)
+                    ? 1 : 0;
+
+                positions[i] += offset;
+                sizes[i] += delta;
+                offset += delta;
+                surplus -= delta;
+            }
+        }
+        Q_ASSERT(surplus == 0);
+#endif
+    }
+
+    if (descents) {
+        for (int i = 0; i < n; ++i) {
+            if (ignore.testBit(start + i))
+                continue;
+            const QGridLayoutBox &box = boxes.at(start + i);
+            descents[i] = fixedDescent(box.q_minimumDescent, box.q_minimumAscent, sizes[i]);
+        }
+    }
+}
+
+QGridLayoutBox QGridLayoutRowData::totalBox(int start, int end) const
+{
+    QGridLayoutBox result;
+    if (start < end) {
+        result.q_maximumSize = 0.0;
+        qreal nextSpacing = 0.0;
+        for (int i = start; i < end; ++i) {
+            result.add(boxes.at(i), stretches.at(i), nextSpacing);
+            nextSpacing = spacings.at(i);
+        }
+    }
+    return result;
+}
+
+void QGridLayoutRowData::stealBox(int start, int end, int which, qreal *positions, qreal *sizes)
+{
+    qreal offset = 0.0;
+    qreal nextSpacing = 0.0;
+
+    for (int i = start; i < end; ++i) {
+        qreal avail = 0.0;
+
+        if (!ignore.testBit(i)) {
+            const QGridLayoutBox &box = boxes.at(i);
+            avail = box.q_sizes(which);
+            offset += nextSpacing;
+            nextSpacing = spacings.at(i);
+        }
+
+        *positions++ = offset;
+        *sizes++ = avail;
+        offset += avail;
+    }
+}
+
+#ifdef QT_DEBUG
+void QGridLayoutRowData::dump(int indent) const
+{
+    qDebug("%*sData", indent, "");
+
+    for (int i = 0; i < ignore.count(); ++i) {
+        qDebug("%*s Row %d (stretch %d, spacing %g)", indent, "", i, stretches.at(i),
+               spacings.at(i));
+        if (ignore.testBit(i))
+            qDebug("%*s  Ignored", indent, "");
+        boxes.at(i).dump(indent + 2);
+    }
+
+    MultiCellMap::const_iterator it = multiCellMap.constBegin();
+    while (it != multiCellMap.constEnd()) {
+        qDebug("%*s Multi-cell entry <%d, %d> (stretch %d)", indent, "", it.key().first,
+               it.key().second, it.value().q_stretch);
+        it.value().q_box.dump(indent + 2);
+    }
+}
+#endif
+
+QGridLayoutItem::QGridLayoutItem(QGridLayoutEngine *engine, QGraphicsLayoutItem *layoutItem,
+                                 int row, int column, int rowSpan, int columnSpan,
+                                 Qt::Alignment alignment)
+    : q_engine(engine), q_layoutItem(layoutItem), q_alignment(alignment)
+{
+    q_firstRows[Hor] = column;
+    q_firstRows[Ver] = row;
+    q_rowSpans[Hor] = columnSpan;
+    q_rowSpans[Ver] = rowSpan;
+    q_stretches[Hor] = -1;
+    q_stretches[Ver] = -1;
+
+    q_engine->addItem(this);
+}
+
+int QGridLayoutItem::firstRow(Qt::Orientation orientation) const
+{
+    return q_firstRows[orientation == Qt::Vertical];
+}
+
+int QGridLayoutItem::firstColumn(Qt::Orientation orientation) const
+{
+    return q_firstRows[orientation == Qt::Horizontal];
+}
+
+int QGridLayoutItem::lastRow(Qt::Orientation orientation) const
+{
+    return firstRow(orientation) + rowSpan(orientation) - 1;
+}
+
+int QGridLayoutItem::lastColumn(Qt::Orientation orientation) const
+{
+    return firstColumn(orientation) + columnSpan(orientation) - 1;
+}
+
+int QGridLayoutItem::rowSpan(Qt::Orientation orientation) const
+{
+    return q_rowSpans[orientation == Qt::Vertical];
+}
+
+int QGridLayoutItem::columnSpan(Qt::Orientation orientation) const
+{
+    return q_rowSpans[orientation == Qt::Horizontal];
+}
+
+void QGridLayoutItem::setFirstRow(int row, Qt::Orientation orientation)
+{
+    q_firstRows[orientation == Qt::Vertical] = row;
+}
+
+void QGridLayoutItem::setRowSpan(int rowSpan, Qt::Orientation orientation)
+{
+    q_rowSpans[orientation == Qt::Vertical] = rowSpan;
+}
+
+int QGridLayoutItem::stretchFactor(Qt::Orientation orientation) const
+{
+    int stretch = q_stretches[orientation == Qt::Vertical];
+    if (stretch >= 0)
+        return stretch;
+
+    QSizePolicy::Policy policy = sizePolicy(orientation);
+
+    if (policy & QSizePolicy::ExpandFlag) {
+        return 1;
+    } else if (policy & QSizePolicy::GrowFlag) {
+        return -1;  // because we max it up
+    } else {
+        return 0;
+    }
+}
+
+void QGridLayoutItem::setStretchFactor(int stretch, Qt::Orientation orientation)
+{
+    Q_ASSERT(stretch >= 0); // ### deal with too big stretches
+    q_stretches[orientation == Qt::Vertical] = stretch;
+}
+
+QSizePolicy::Policy QGridLayoutItem::sizePolicy(Qt::Orientation orientation) const
+{
+    QSizePolicy sizePolicy(q_layoutItem->sizePolicy());
+    return (orientation == Qt::Horizontal) ? sizePolicy.horizontalPolicy()
+                                           : sizePolicy.verticalPolicy();
+}
+
+QSizePolicy::ControlTypes QGridLayoutItem::controlTypes(LayoutSide /* side */) const
+{
+    return q_layoutItem->sizePolicy().controlType();
+}
+
+QSizeF QGridLayoutItem::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
+{
+    return q_layoutItem->effectiveSizeHint(which, constraint);
+}
+
+QGridLayoutBox QGridLayoutItem::box(Qt::Orientation orientation, qreal constraint) const
+{
+    QGridLayoutBox result;
+    QSizePolicy::Policy policy = sizePolicy(orientation);
+
+    if (orientation == Qt::Horizontal) {
+        QSizeF constraintSize(-1.0, constraint);
+
+        result.q_preferredSize = sizeHint(Qt::PreferredSize, constraintSize).width();
+
+        if (policy & QSizePolicy::ShrinkFlag) {
+            result.q_minimumSize = sizeHint(Qt::MinimumSize, constraintSize).width();
+        } else {
+            result.q_minimumSize = result.q_preferredSize;
+        }
+
+        if (policy & (QSizePolicy::GrowFlag | QSizePolicy::ExpandFlag)) {
+            result.q_maximumSize = sizeHint(Qt::MaximumSize, constraintSize).width();
+        } else {
+            result.q_maximumSize = result.q_preferredSize;
+        }
+    } else {
+        QSizeF constraintSize(constraint, -1.0);
+
+        result.q_preferredSize = sizeHint(Qt::PreferredSize, constraintSize).height();
+
+        if (policy & QSizePolicy::ShrinkFlag) {
+            result.q_minimumSize = sizeHint(Qt::MinimumSize, constraintSize).height();
+        } else {
+            result.q_minimumSize = result.q_preferredSize;
+        }
+
+        if (policy & (QSizePolicy::GrowFlag | QSizePolicy::ExpandFlag)) {
+            result.q_maximumSize = sizeHint(Qt::MaximumSize, constraintSize).height();
+        } else {
+            result.q_maximumSize = result.q_preferredSize;
+        }
+
+        result.q_minimumDescent = sizeHint(Qt::MinimumDescent, constraintSize).height();
+        if (result.q_minimumDescent >= 0.0)
+            result.q_minimumAscent = result.q_minimumSize - result.q_minimumDescent;
+    }
+    if (policy & QSizePolicy::IgnoreFlag)
+        result.q_preferredSize = result.q_minimumSize;
+
+    return result;
+}
+
+QRectF QGridLayoutItem::geometryWithin(qreal x, qreal y, qreal width, qreal height,
+                                       qreal rowDescent) const
+{
+    rowDescent = -1.0; // ### This disables the descent
+
+    QGridLayoutBox vBox = box(Qt::Vertical);
+    if (vBox.q_minimumDescent < 0.0 || rowDescent < 0.0) {
+        qreal cellWidth = width;
+        qreal cellHeight = height;
+
+        QSizeF size = effectiveMaxSize().boundedTo(QSizeF(cellWidth, cellHeight));
+        width = size.width();
+        height = size.height();
+        
+        Qt::Alignment align = q_engine->effectiveAlignment(this);
+        switch (align & Qt::AlignHorizontal_Mask) {
+        case Qt::AlignHCenter:
+            x += (cellWidth - width)/2;
+            break;
+        case Qt::AlignRight:
+            x += cellWidth - width;
+            break;
+        default:
+            break;
+        }
+        switch (align & Qt::AlignVertical_Mask) {
+        case Qt::AlignVCenter:
+            y += (cellHeight - height)/2;
+            break;
+        case Qt::AlignBottom:
+            y += cellHeight - height;
+            break;
+        default:
+            break;
+        }
+        return QRectF(x, y, width, height);
+    } else {
+        qreal descent = vBox.q_minimumDescent;
+        qreal ascent = vBox.q_minimumSize - descent;
+        return QRectF(x, y + height - rowDescent - ascent, width, ascent + descent);
+    }
+}
+
+void QGridLayoutItem::setGeometry(const QRectF &rect)
+{
+    q_layoutItem->setGeometry(rect);
+}
+
+void QGridLayoutItem::transpose()
+{
+    qSwap(q_firstRows[Hor], q_firstRows[Ver]);
+    qSwap(q_rowSpans[Hor], q_rowSpans[Ver]);
+    qSwap(q_stretches[Hor], q_stretches[Ver]);
+}
+
+void QGridLayoutItem::insertOrRemoveRows(int row, int delta, Qt::Orientation orientation)
+{
+    int oldFirstRow = firstRow(orientation);
+    if (oldFirstRow >= row) {
+        setFirstRow(oldFirstRow + delta, orientation);
+    } else if (lastRow(orientation) >= row) {
+        setRowSpan(rowSpan(orientation) + delta, orientation);
+    }
+}
+/*!
+    \internal
+    returns the effective maximumSize, will take the sizepolicy into
+    consideration. (i.e. if sizepolicy does not have QSizePolicy::Grow, then
+    maxSizeHint will be the preferredSize)
+    Note that effectiveSizeHint does not take sizePolicy into consideration,
+    (since it only evaluates the hints, as the name implies)
+*/
+QSizeF QGridLayoutItem::effectiveMaxSize() const
+{
+    QSizeF size;
+    bool vGrow = (sizePolicy(Qt::Vertical) & QSizePolicy::GrowFlag) == QSizePolicy::GrowFlag;
+    bool hGrow = (sizePolicy(Qt::Horizontal) & QSizePolicy::GrowFlag) == QSizePolicy::GrowFlag;
+    if (!vGrow || !hGrow) {
+        QSizeF pref = layoutItem()->effectiveSizeHint(Qt::PreferredSize);
+        if (!vGrow)
+            size.setHeight(pref.height());
+        if (!hGrow)
+            size.setWidth(pref.width());
+    }
+
+    if (!size.isValid()) {
+        QSizeF maxSize = layoutItem()->effectiveSizeHint(Qt::MaximumSize);
+        if (size.width() == -1)
+            size.setWidth(maxSize.width());
+        if (size.height() == -1)
+            size.setHeight(maxSize.height());
+    }
+    return size;
+}
+
+#ifdef QT_DEBUG
+void QGridLayoutItem::dump(int indent) const
+{
+    qDebug("%*s%p (%d, %d) %d x %d", indent, "", q_layoutItem, firstRow(), firstColumn(),
+           rowSpan(), columnSpan());
+
+    if (q_stretches[Hor] >= 0)
+        qDebug("%*s Horizontal stretch: %d", indent, "", q_stretches[Hor]);
+    if (q_stretches[Ver] >= 0)
+        qDebug("%*s Vertical stretch: %d", indent, "", q_stretches[Ver]);
+    if (q_alignment != 0)
+        qDebug("%*s Alignment: %x", indent, "", uint(q_alignment));
+    qDebug("%*s Horizontal size policy: %x Vertical size policy: %x",
+        indent, "", sizePolicy(Qt::Horizontal), sizePolicy(Qt::Vertical));
+}
+#endif
+
+void QGridLayoutRowInfo::insertOrRemoveRows(int row, int delta)
+{
+    count += delta;
+    
+    insertOrRemoveItems(stretches, row, delta);
+    insertOrRemoveItems(spacings, row, delta);
+    insertOrRemoveItems(alignments, row, delta);
+    insertOrRemoveItems(boxes, row, delta);
+}
+
+#ifdef QT_DEBUG
+void QGridLayoutRowInfo::dump(int indent) const
+{
+    qDebug("%*sInfo (count: %d)", indent, "", count);
+    for (int i = 0; i < count; ++i) {
+        QString message;
+
+        if (stretches.value(i).value() >= 0)
+            message += QString::fromAscii(" stretch %1").arg(stretches.value(i).value());
+        if (spacings.value(i).value() >= 0.0)
+            message += QString::fromAscii(" spacing %1").arg(spacings.value(i).value());
+        if (alignments.value(i) != 0)
+            message += QString::fromAscii(" alignment %1").arg(int(alignments.value(i)), 16);
+
+        if (!message.isEmpty() || boxes.value(i) != QGridLayoutBox()) {
+            qDebug("%*s Row %d:%s", indent, "", i, qPrintable(message));
+            if (boxes.value(i) != QGridLayoutBox())
+                boxes.value(i).dump(indent + 1);
+        }
+    }
+}
+#endif
+
+QGridLayoutEngine::QGridLayoutEngine()
+{
+    m_visualDirection = Qt::LeftToRight;
+    invalidate();
+}
+
+int QGridLayoutEngine::rowCount(Qt::Orientation orientation) const
+{
+    return q_infos[orientation == Qt::Vertical].count;
+}
+
+int QGridLayoutEngine::columnCount(Qt::Orientation orientation) const
+{
+    return q_infos[orientation == Qt::Horizontal].count;
+}
+
+int QGridLayoutEngine::itemCount() const
+{
+    return q_items.count();
+}
+
+QGridLayoutItem *QGridLayoutEngine::itemAt(int index) const
+{
+    Q_ASSERT(index >= 0 && index < itemCount());
+    return q_items.at(index);
+}
+
+int QGridLayoutEngine::effectiveFirstRow(Qt::Orientation orientation) const
+{
+    ensureEffectiveFirstAndLastRows();
+    return q_cachedEffectiveFirstRows[orientation == Qt::Vertical];
+}
+
+int QGridLayoutEngine::effectiveLastRow(Qt::Orientation orientation) const
+{
+    ensureEffectiveFirstAndLastRows();
+    return q_cachedEffectiveLastRows[orientation == Qt::Vertical];
+}
+
+void QGridLayoutEngine::setSpacing(qreal spacing, Qt::Orientations orientations)
+{
+    Q_ASSERT(spacing >= 0.0);
+    if (orientations & Qt::Horizontal)
+        q_defaultSpacings[Hor].setUserValue(spacing);
+    if (orientations & Qt::Vertical)
+        q_defaultSpacings[Ver].setUserValue(spacing);
+
+    invalidate();
+}
+
+qreal QGridLayoutEngine::spacing(const QLayoutStyleInfo &styleInfo, Qt::Orientation orientation) const
+{
+    if (q_defaultSpacings[orientation == Qt::Vertical].isDefault()) {
+        QStyle *style = styleInfo.style();
+        QStyleOption option;
+        option.initFrom(styleInfo.widget());
+        qreal defaultSpacing = (qreal)style->pixelMetric(orientation == Qt::Vertical ? QStyle::PM_LayoutVerticalSpacing
+                                               : QStyle::PM_LayoutHorizontalSpacing, &option, styleInfo.widget());
+        q_defaultSpacings[orientation == Qt::Vertical].setCachedValue(defaultSpacing);
+    }
+    return q_defaultSpacings[orientation == Qt::Vertical].value();
+}
+
+void QGridLayoutEngine::setRowSpacing(int row, qreal spacing, Qt::Orientation orientation)
+{
+    Q_ASSERT(row >= 0);
+
+    QGridLayoutRowInfo &rowInfo = q_infos[orientation == Qt::Vertical];
+    if (row >= rowInfo.spacings.count())
+        rowInfo.spacings.resize(row + 1);
+    if (spacing >= 0)
+        rowInfo.spacings[row].setUserValue(spacing);
+    else
+        rowInfo.spacings[row] = QLayoutParameter<qreal>();
+    invalidate();
+}
+
+qreal QGridLayoutEngine::rowSpacing(int row, Qt::Orientation orientation) const
+{
+    QLayoutParameter<qreal> spacing = q_infos[orientation == Qt::Vertical].spacings.value(row);
+    if (!spacing.isDefault())
+        return spacing.value();
+    return q_defaultSpacings[orientation == Qt::Vertical].value();
+}
+
+void QGridLayoutEngine::setRowStretchFactor(int row, int stretch, Qt::Orientation orientation)
+{
+    Q_ASSERT(row >= 0);
+    Q_ASSERT(stretch >= 0);
+
+    maybeExpandGrid(row, -1, orientation);
+
+    QGridLayoutRowInfo &rowInfo = q_infos[orientation == Qt::Vertical];
+    if (row >= rowInfo.stretches.count())
+        rowInfo.stretches.resize(row + 1);
+    rowInfo.stretches[row].setUserValue(stretch);
+}
+
+int QGridLayoutEngine::rowStretchFactor(int row, Qt::Orientation orientation) const
+{
+    QStretchParameter stretch = q_infos[orientation == Qt::Vertical].stretches.value(row);
+    if (!stretch.isDefault())
+        return stretch.value();
+    return 0;
+}
+
+void QGridLayoutEngine::setStretchFactor(QGraphicsLayoutItem *layoutItem, int stretch,
+                                         Qt::Orientation orientation)
+{
+    Q_ASSERT(stretch >= 0);
+
+    if (QGridLayoutItem *item = findLayoutItem(layoutItem))
+        item->setStretchFactor(stretch, orientation);
+}
+
+int QGridLayoutEngine::stretchFactor(QGraphicsLayoutItem *layoutItem, Qt::Orientation orientation) const
+{
+    if (QGridLayoutItem *item = findLayoutItem(layoutItem))
+        return item->stretchFactor(orientation);
+    return 0;
+}
+
+void QGridLayoutEngine::setRowSizeHint(Qt::SizeHint which, int row, qreal size,
+                                       Qt::Orientation orientation)
+{
+    Q_ASSERT(row >= 0);
+    Q_ASSERT(size >= 0.0);
+
+    maybeExpandGrid(row, -1, orientation);
+
+    QGridLayoutRowInfo &rowInfo = q_infos[orientation == Qt::Vertical];
+    if (row >= rowInfo.boxes.count())
+        rowInfo.boxes.resize(row + 1);
+    rowInfo.boxes[row].q_sizes(which) = size;
+}
+
+qreal QGridLayoutEngine::rowSizeHint(Qt::SizeHint which, int row, Qt::Orientation orientation) const
+{
+    return q_infos[orientation == Qt::Vertical].boxes.value(row).q_sizes(which);
+}
+
+void QGridLayoutEngine::setRowAlignment(int row, Qt::Alignment alignment,
+                                        Qt::Orientation orientation)
+{
+    Q_ASSERT(row >= 0);
+
+    maybeExpandGrid(row, -1, orientation);
+
+    QGridLayoutRowInfo &rowInfo = q_infos[orientation == Qt::Vertical];
+    if (row >= rowInfo.alignments.count())
+        rowInfo.alignments.resize(row + 1);
+    rowInfo.alignments[row] = alignment;
+}
+
+Qt::Alignment QGridLayoutEngine::rowAlignment(int row, Qt::Orientation orientation) const
+{
+    Q_ASSERT(row >= 0);
+    return q_infos[orientation == Qt::Vertical].alignments.value(row);
+}
+
+void QGridLayoutEngine::setAlignment(QGraphicsLayoutItem *layoutItem, Qt::Alignment alignment)
+{
+    if (QGridLayoutItem *item = findLayoutItem(layoutItem))
+        item->setAlignment(alignment);
+    invalidate();
+}
+
+Qt::Alignment QGridLayoutEngine::alignment(QGraphicsLayoutItem *layoutItem) const
+{
+    if (QGridLayoutItem *item = findLayoutItem(layoutItem))
+        return item->alignment();
+    return 0;
+}
+
+Qt::Alignment QGridLayoutEngine::effectiveAlignment(const QGridLayoutItem *layoutItem) const
+{
+    Qt::Alignment align = layoutItem->alignment();
+    if (!(align & Qt::AlignVertical_Mask)) {
+        // no vertical alignment, respect the row alignment
+        int y = layoutItem->firstRow();
+        align |= (rowAlignment(y, Qt::Vertical) & Qt::AlignVertical_Mask);
+    }
+    if (!(align & Qt::AlignHorizontal_Mask)) {
+        // no horizontal alignment, respect the column alignment
+        int x = layoutItem->firstColumn();
+        align |= (rowAlignment(x, Qt::Horizontal) & Qt::AlignHorizontal_Mask);
+    }
+    return align;
+}
+
+void QGridLayoutEngine::addItem(QGridLayoutItem *item)
+{
+    maybeExpandGrid(item->lastRow(), item->lastColumn());
+
+    q_items.append(item);
+
+    for (int i = item->firstRow(); i <= item->lastRow(); ++i) {
+        for (int j = item->firstColumn(); j <= item->lastColumn(); ++j) {
+            if (itemAt(i, j))
+                qWarning("QGridLayoutEngine::addItem: Cell (%d, %d) already taken", i, j);
+            setItemAt(i, j, item);
+        }
+    }
+}
+
+void QGridLayoutEngine::removeItem(QGridLayoutItem *item)
+{
+    Q_ASSERT(q_items.contains(item));
+
+    invalidate();
+
+    for (int i = item->firstRow(); i <= item->lastRow(); ++i) {
+        for (int j = item->firstColumn(); j <= item->lastColumn(); ++j) {
+            if (itemAt(i, j) == item)
+                setItemAt(i, j, 0);
+        }
+    }
+
+    q_items.removeAll(item);
+}
+
+QGridLayoutItem *QGridLayoutEngine::findLayoutItem(QGraphicsLayoutItem *layoutItem) const
+{
+    for (int i = q_items.count() - 1; i >= 0; --i) {
+        QGridLayoutItem *item = q_items.at(i);
+        if (item->layoutItem() == layoutItem)
+            return item;
+    }
+    return 0;
+}
+
+QGridLayoutItem *QGridLayoutEngine::itemAt(int row, int column, Qt::Orientation orientation) const
+{
+    if (orientation == Qt::Horizontal)
+        qSwap(row, column);
+    if (uint(row) >= uint(rowCount()) || uint(column) >= uint(columnCount()))
+        return 0;
+    return q_grid.at((row * internalGridColumnCount()) + column);
+}
+
+void QGridLayoutEngine::invalidate()
+{
+    q_cachedEffectiveFirstRows[Hor] = -1;
+    q_cachedEffectiveFirstRows[Ver] = -1;
+    q_cachedEffectiveLastRows[Hor] = -1;
+    q_cachedEffectiveLastRows[Ver] = -1;
+    q_cachedDataForStyleInfo.invalidate();
+    q_cachedSize = QSizeF();
+}
+
+static void visualRect(QRectF *geom, Qt::LayoutDirection dir, const QRectF &contentsRect)
+{
+    if (dir == Qt::RightToLeft)
+        geom->moveRight(contentsRect.right() - (geom->left() - contentsRect.left()));
+}
+
+void QGridLayoutEngine::setGeometries(const QLayoutStyleInfo &styleInfo,
+                                      const QRectF &contentsGeometry)
+{
+    if (rowCount() < 1 || columnCount() < 1)
+        return;
+
+    ensureGeometries(styleInfo, contentsGeometry.size());
+
+    for (int i = q_items.count() - 1; i >= 0; --i) {
+        QGridLayoutItem *item = q_items.at(i);
+
+        qreal x = q_xx[item->firstColumn()];
+        qreal y = q_yy[item->firstRow()];
+        qreal width = q_widths[item->lastColumn()];
+        qreal height = q_heights[item->lastRow()];
+
+        if (item->columnSpan() != 1)
+            width += q_xx[item->lastColumn()] - x;
+        if (item->rowSpan() != 1)
+            height += q_yy[item->lastRow()] - y;
+
+        QRectF geom = item->geometryWithin(contentsGeometry.x() + x, contentsGeometry.y() + y,
+                                               width, height, q_descents[item->lastRow()]);
+        visualRect(&geom, visualDirection(), contentsGeometry);
+        item->setGeometry(geom);
+    }
+}
+
+// ### candidate for deletion
+QRectF QGridLayoutEngine::cellRect(const QLayoutStyleInfo &styleInfo,
+                                   const QRectF &contentsGeometry, int row, int column, int rowSpan,
+                                   int columnSpan) const
+{
+    if (uint(row) >= uint(rowCount()) || uint(column) >= uint(columnCount())
+            || rowSpan < 1 || columnSpan < 1)
+        return QRectF();
+
+    ensureGeometries(styleInfo, contentsGeometry.size());
+
+    int lastColumn = qMax(column + columnSpan, columnCount()) - 1;
+    int lastRow = qMax(row + rowSpan, rowCount()) - 1;
+
+    qreal x = q_xx[column];
+    qreal y = q_yy[row];
+    qreal width = q_widths[lastColumn];
+    qreal height = q_heights[lastRow];
+
+    if (columnSpan != 1)
+        width += q_xx[lastColumn] - x;
+    if (rowSpan != 1)
+        height += q_yy[lastRow] - y;
+
+    return QRectF(contentsGeometry.x() + x, contentsGeometry.y() + y, width, height);
+}
+
+QSizeF QGridLayoutEngine::sizeHint(const QLayoutStyleInfo &styleInfo, Qt::SizeHint which,
+                                   const QSizeF & /* constraint */) const
+{
+    ensureColumnAndRowData(styleInfo);
+
+    switch (which) {
+    case Qt::MinimumSize:
+        return QSizeF(q_totalBoxes[Hor].q_minimumSize, q_totalBoxes[Ver].q_minimumSize);
+    case Qt::PreferredSize:
+        return QSizeF(q_totalBoxes[Hor].q_preferredSize, q_totalBoxes[Ver].q_preferredSize);
+    case Qt::MaximumSize:
+        return QSizeF(q_totalBoxes[Hor].q_maximumSize, q_totalBoxes[Ver].q_maximumSize);
+    case Qt::MinimumDescent:
+        return QSizeF(-1.0, q_totalBoxes[Hor].q_minimumDescent);    // ### doesn't work
+    default:
+        break;
+    }
+    return QSizeF();
+} 
+
+QSizePolicy::ControlTypes QGridLayoutEngine::controlTypes(LayoutSide side) const
+{
+    Qt::Orientation orientation = (side == Top || side == Bottom) ? Qt::Vertical : Qt::Horizontal;
+    int row = (side == Top || side == Left) ? effectiveFirstRow(orientation)
+                                            : effectiveLastRow(orientation);
+    QSizePolicy::ControlTypes result = 0;
+
+    for (int column = columnCount(orientation) - 1; column >= 0; --column) {
+        if (QGridLayoutItem *item = itemAt(row, column, orientation))
+            result |= item->controlTypes(side);
+    }
+    return result;
+}
+
+void QGridLayoutEngine::transpose()
+{
+    invalidate();
+
+    for (int i = q_items.count() - 1; i >= 0; --i)
+        q_items.at(i)->transpose();
+
+    qSwap(q_defaultSpacings[Hor], q_defaultSpacings[Ver]);
+    qSwap(q_infos[Hor], q_infos[Ver]);
+
+    regenerateGrid();
+}
+
+void QGridLayoutEngine::setVisualDirection(Qt::LayoutDirection direction)
+{
+    m_visualDirection = direction;
+}
+
+Qt::LayoutDirection QGridLayoutEngine::visualDirection() const
+{
+    return m_visualDirection;
+}
+
+#ifdef QT_DEBUG
+void QGridLayoutEngine::dump(int indent) const
+{
+    qDebug("%*sEngine", indent, "");
+
+    qDebug("%*s Items (%d)", indent, "", q_items.count());
+    int i;
+    for (i = 0; i < q_items.count(); ++i)
+        q_items.at(i)->dump(indent + 2);
+
+    qDebug("%*s Grid (%d x %d)", indent, "", internalGridRowCount(),
+           internalGridColumnCount());
+    for (int row = 0; row < internalGridRowCount(); ++row) {
+        QString message = QLatin1String("[ ");
+        for (int column = 0; column < internalGridColumnCount(); ++column) {
+            message += QString::number(q_items.indexOf(itemAt(row, column))).rightJustified(3);
+            message += QLatin1String(" ");
+        }
+        message += QLatin1String("]");
+        qDebug("%*s  %s", indent, "", qPrintable(message));
+    }
+
+    if (q_defaultSpacings[Hor].value() >= 0.0 || q_defaultSpacings[Ver].value() >= 0.0)
+        qDebug("%*s Default spacings: %g %g", indent, "", q_defaultSpacings[Hor].value(),
+               q_defaultSpacings[Ver].value());
+
+    qDebug("%*s Column and row info", indent, "");
+    q_infos[Hor].dump(indent + 2);
+    q_infos[Ver].dump(indent + 2);
+
+    qDebug("%*s Column and row data", indent, "");
+    q_columnData.dump(indent + 2);
+    q_rowData.dump(indent + 2);
+
+    qDebug("%*s Geometries output", indent, "");
+    for (int pass = 0; pass < 2; ++pass) {
+        QVector<qreal> &cellPos = q_yy;
+        QString message;
+        for (i = 0; i < cellPos.count(); ++i) {
+            message += QLatin1String((message.isEmpty() ? "[" : ", "));
+            message += QString::number(cellPos.at(i));
+        }
+        message += QLatin1String("]");
+        qDebug("%*s %s %s", indent, "", (pass == 0 ? "rows:" : "columns:"), qPrintable(message));
+        cellPos = q_xx;
+    }
+}
+#endif
+
+void QGridLayoutEngine::maybeExpandGrid(int row, int column, Qt::Orientation orientation)
+{
+    invalidate();   // ### move out of here?
+
+    if (orientation == Qt::Horizontal)
+        qSwap(row, column);
+
+    if (row < rowCount() && column < columnCount())
+        return;
+
+    int oldGridRowCount = internalGridRowCount();
+    int oldGridColumnCount = internalGridColumnCount();
+
+    q_infos[Ver].count = qMax(row + 1, rowCount());
+    q_infos[Hor].count = qMax(column + 1, columnCount());
+
+    int newGridRowCount = internalGridRowCount();
+    int newGridColumnCount = internalGridColumnCount();
+
+    int newGridSize = newGridRowCount * newGridColumnCount;
+    if (newGridSize != q_grid.count()) {
+        q_grid.resize(newGridSize);
+
+        if (newGridColumnCount != oldGridColumnCount) {
+            for (int i = oldGridRowCount - 1; i >= 1; --i) {
+                for (int j = oldGridColumnCount - 1; j >= 0; --j) {
+                    int oldIndex = (i * oldGridColumnCount) + j;
+                    int newIndex = (i * newGridColumnCount) + j;
+
+                    Q_ASSERT(newIndex > oldIndex);
+                    q_grid[newIndex] = q_grid[oldIndex];
+                    q_grid[oldIndex] = 0;
+                }
+            }
+        }
+    }
+}
+
+void QGridLayoutEngine::regenerateGrid()
+{
+    q_grid.fill(0);
+
+    for (int i = q_items.count() - 1; i >= 0; --i) {
+        QGridLayoutItem *item = q_items.at(i);
+
+        for (int j = item->firstRow(); j <= item->lastRow(); ++j) {
+            for (int k = item->firstColumn(); k <= item->lastColumn(); ++k) {
+                setItemAt(j, k, item);
+            }
+        }
+    }
+}
+
+void QGridLayoutEngine::setItemAt(int row, int column, QGridLayoutItem *item)
+{
+    Q_ASSERT(row >= 0 && row < rowCount());
+    Q_ASSERT(column >= 0 && column < columnCount());
+    q_grid[(row * internalGridColumnCount()) + column] = item;
+}
+
+void QGridLayoutEngine::insertOrRemoveRows(int row, int delta, Qt::Orientation orientation)
+{
+    int oldRowCount = rowCount(orientation);
+    Q_ASSERT(uint(row) <= uint(oldRowCount));
+
+    invalidate();
+
+    // appending rows (or columns) is easy
+    if (row == oldRowCount && delta > 0) {
+        maybeExpandGrid(oldRowCount + delta - 1, -1, orientation);
+        return;
+    }
+
+    q_infos[orientation == Qt::Vertical].insertOrRemoveRows(row, delta);
+
+    for (int i = q_items.count() - 1; i >= 0; --i)
+        q_items.at(i)->insertOrRemoveRows(row, delta, orientation);
+
+    q_grid.resize(internalGridRowCount() * internalGridColumnCount());
+    regenerateGrid();
+}
+
+void QGridLayoutEngine::fillRowData(QGridLayoutRowData *rowData, const QLayoutStyleInfo &styleInfo,
+                                    Qt::Orientation orientation) const
+{
+    const int ButtonMask = QSizePolicy::ButtonBox | QSizePolicy::PushButton;
+    const QGridLayoutRowInfo &rowInfo = q_infos[orientation == Qt::Vertical];
+    const QGridLayoutRowInfo &columnInfo = q_infos[orientation == Qt::Horizontal];
+    LayoutSide top = (orientation == Qt::Vertical) ? Top : Left;
+    LayoutSide bottom = (orientation == Qt::Vertical) ? Bottom : Right;
+
+    QStyle *style = styleInfo.style();
+    QStyleOption option;
+    option.initFrom(styleInfo.widget());
+
+    const QLayoutParameter<qreal> &defaultSpacing = q_defaultSpacings[orientation == Qt::Vertical];
+    qreal innerSpacing = 0.0;
+    if (style)
+        innerSpacing = (qreal)style->pixelMetric(orientation == Qt::Vertical ? QStyle::PM_LayoutVerticalSpacing
+                                                       : QStyle::PM_LayoutHorizontalSpacing,
+                           &option, styleInfo.widget());
+    if (innerSpacing >= 0.0)
+        defaultSpacing.setCachedValue(innerSpacing);
+
+    for (int row = 0; row < rowInfo.count; ++row) {
+        bool rowIsEmpty = true;
+        bool rowIsIdenticalToPrevious = (row > 0);
+
+        for (int column = 0; column < columnInfo.count; ++column) {
+            QGridLayoutItem *item = itemAt(row, column, orientation);
+
+            if (rowIsIdenticalToPrevious && item != itemAt(row - 1, column, orientation))
+                rowIsIdenticalToPrevious = false;
+
+            if (item)
+                rowIsEmpty = false;
+        }
+
+        if ((rowIsEmpty || rowIsIdenticalToPrevious)
+                && rowInfo.spacings.value(row).isDefault()
+                && rowInfo.stretches.value(row).isDefault()
+                && rowInfo.boxes.value(row) == QGridLayoutBox())
+            rowData->ignore.setBit(row, true);
+
+        if (rowInfo.spacings.value(row).isUser()) {
+            rowData->spacings[row] = rowInfo.spacings.at(row).value();
+        } else if (!defaultSpacing.isDefault()) {
+            rowData->spacings[row] = defaultSpacing.value();
+        }
+
+        rowData->stretches[row] = rowInfo.stretches.value(row).value();
+    }
+
+    struct RowAdHocData {
+        int q_row;
+        unsigned int q_hasButtons : 8;
+        unsigned int q_hasNonButtons : 8;
+
+        inline RowAdHocData() : q_row(-1), q_hasButtons(false), q_hasNonButtons(false) {}
+        inline void init(int row) {
+            this->q_row = row;
+            q_hasButtons = false;
+            q_hasNonButtons = false;
+        }
+        inline bool hasOnlyButtons() const { return q_hasButtons && !q_hasNonButtons; }
+        inline bool hasOnlyNonButtons() const { return q_hasNonButtons && !q_hasButtons; }
+    };
+    RowAdHocData lastRowAdHocData;
+    RowAdHocData nextToLastRowAdHocData;
+    RowAdHocData nextToNextToLastRowAdHocData;
+
+    rowData->hasIgnoreFlag = false;
+    for (int row = 0; row < rowInfo.count; ++row) {
+        if (rowData->ignore.testBit(row))
+            continue;
+
+        QGridLayoutBox &rowBox = rowData->boxes[row];
+        if (option.state & QStyle::State_Window) {
+            nextToNextToLastRowAdHocData = nextToLastRowAdHocData;
+            nextToLastRowAdHocData = lastRowAdHocData;
+            lastRowAdHocData.init(row);
+        }
+
+        bool userRowStretch = rowInfo.stretches.value(row).isUser();
+        int &rowStretch = rowData->stretches[row];
+
+        bool hasIgnoreFlag = true;
+        for (int column = 0; column < columnInfo.count; ++column) {
+            QGridLayoutItem *item = itemAt(row, column, orientation);
+            if (item) {
+                int itemRow = item->firstRow(orientation);
+                int itemColumn = item->firstColumn(orientation);
+
+                if (itemRow == row && itemColumn == column) {
+                    int itemStretch = item->stretchFactor(orientation);
+                    if (!(item->sizePolicy(orientation) & QSizePolicy::IgnoreFlag))
+                        hasIgnoreFlag = false;
+                    int itemRowSpan = item->rowSpan(orientation);
+
+                    int effectiveRowSpan = 1;
+                    for (int i = 1; i < itemRowSpan; ++i) {
+                        if (!rowData->ignore.testBit(i))
+                            ++effectiveRowSpan;
+                    }
+
+                    QGridLayoutBox *box;
+                    if (effectiveRowSpan == 1) {
+                        box = &rowBox;
+                        if (!userRowStretch)
+                            rowStretch = qMax(rowStretch, itemStretch);
+                    } else {
+                        QGridLayoutMultiCellData &multiCell =
+                                rowData->multiCellMap[qMakePair(row, effectiveRowSpan)];
+                        box = &multiCell.q_box;
+                        multiCell.q_stretch = itemStretch;
+                    }
+                    box->combine(item->box(orientation));
+
+                    if (effectiveRowSpan == 1) {
+                        QSizePolicy::ControlTypes controls = item->controlTypes(top);
+                        if (controls & ButtonMask)
+                            lastRowAdHocData.q_hasButtons = true;
+                        if (controls & ~ButtonMask)
+                            lastRowAdHocData.q_hasNonButtons = true;
+                    }
+                }
+            }
+        }
+        if (row < rowInfo.boxes.count()) {
+            QGridLayoutBox rowBoxInfo = rowInfo.boxes.at(row);
+            rowBoxInfo.normalize();
+            rowBox.q_minimumSize = qMax(rowBox.q_minimumSize, rowBoxInfo.q_minimumSize);
+            rowBox.q_maximumSize = qMax(rowBox.q_minimumSize,
+                                        (rowBoxInfo.q_maximumSize != FLT_MAX ?
+                                        rowBoxInfo.q_maximumSize : rowBox.q_maximumSize));
+            rowBox.q_preferredSize = qBound(rowBox.q_minimumSize,
+                                            qMax(rowBox.q_preferredSize, rowBoxInfo.q_preferredSize),
+                                            rowBox.q_maximumSize);
+        }
+        if (hasIgnoreFlag)
+            rowData->hasIgnoreFlag = true;
+    }
+
+    /*
+        Heuristic: Detect button boxes that don't use QSizePolicy::ButtonBox.
+        This is somewhat ad hoc but it usually does the trick.
+    */
+    bool lastRowIsButtonBox = (lastRowAdHocData.hasOnlyButtons()
+                               && nextToLastRowAdHocData.hasOnlyNonButtons());
+    bool lastTwoRowsIsButtonBox = (lastRowAdHocData.hasOnlyButtons()
+                                   && nextToLastRowAdHocData.hasOnlyButtons()
+                                   && nextToNextToLastRowAdHocData.hasOnlyNonButtons()
+                                   && orientation == Qt::Vertical);
+
+    if (defaultSpacing.isDefault()) {
+        int prevRow = -1;
+        for (int row = 0; row < rowInfo.count; ++row) {
+            if (rowData->ignore.testBit(row))
+                continue;
+
+            if (prevRow != -1 && !rowInfo.spacings.value(prevRow).isUser()) {
+                qreal &rowSpacing = rowData->spacings[prevRow];
+                for (int column = 0; column < columnInfo.count; ++column) {
+                    QGridLayoutItem *item1 = itemAt(prevRow, column, orientation);
+                    QGridLayoutItem *item2 = itemAt(row, column, orientation);
+
+                    if (item1 && item2 && item1 != item2) {
+                        QSizePolicy::ControlTypes controls1 = item1->controlTypes(bottom);
+                        QSizePolicy::ControlTypes controls2 = item2->controlTypes(top);
+
+                        if (controls2 & QSizePolicy::PushButton) {
+                            if ((row == nextToLastRowAdHocData.q_row && lastTwoRowsIsButtonBox)
+                                    || (row == lastRowAdHocData.q_row && lastRowIsButtonBox)) {
+                                controls2 &= ~QSizePolicy::PushButton;
+                                controls2 |= QSizePolicy::ButtonBox;
+                            }
+                        }
+
+                        qreal spacing = style->combinedLayoutSpacing(controls1, controls2,
+                                                                     orientation, &option,
+                                                                     styleInfo.widget());
+                        if (orientation == Qt::Horizontal) {
+                            qreal width1 = rowData->boxes.at(prevRow).q_minimumSize;
+                            qreal width2 = rowData->boxes.at(row).q_minimumSize;
+                            QRectF rect1 = item1->geometryWithin(0.0, 0.0, width1, FLT_MAX, -1.0);
+                            QRectF rect2 = item2->geometryWithin(0.0, 0.0, width2, FLT_MAX, -1.0);
+                            spacing -= (width1 - (rect1.x() + rect1.width())) + rect2.x();
+                        } else {
+                            const QGridLayoutBox &box1 = rowData->boxes.at(prevRow);
+                            const QGridLayoutBox &box2 = rowData->boxes.at(row);
+                            qreal height1 = box1.q_minimumSize;
+                            qreal height2 = box2.q_minimumSize;
+                            qreal rowDescent1 = fixedDescent(box1.q_minimumDescent,
+                                                             box1.q_minimumAscent, height1);
+                            qreal rowDescent2 = fixedDescent(box2.q_minimumDescent,
+                                                             box2.q_minimumAscent, height2);
+                            QRectF rect1 = item1->geometryWithin(0.0, 0.0, FLT_MAX, height1,
+                                                                 rowDescent1);
+                            QRectF rect2 = item2->geometryWithin(0.0, 0.0, FLT_MAX, height2,
+                                                                 rowDescent2);
+                            spacing -= (height1 - (rect1.y() + rect1.height())) + rect2.y();
+                        }
+                        rowSpacing = qMax(spacing, rowSpacing);
+                    }
+                }
+            }
+            prevRow = row;
+        }
+    } else if (lastRowIsButtonBox || lastTwoRowsIsButtonBox) {
+        /*
+            Even for styles that define a uniform spacing, we cheat a
+            bit and use the window margin as the spacing. This
+            significantly improves the look of dialogs.
+        */
+        int prevRow = lastRowIsButtonBox ? nextToLastRowAdHocData.q_row
+                                         : nextToNextToLastRowAdHocData.q_row;
+        if (!defaultSpacing.isUser() && !rowInfo.spacings.value(prevRow).isUser()) {
+            qreal windowMargin = style->pixelMetric(orientation == Qt::Vertical
+                                                          ? QStyle::PM_LayoutBottomMargin
+                                                          : QStyle::PM_LayoutRightMargin,
+                                                  &option, styleInfo.widget());
+
+            qreal &rowSpacing = rowData->spacings[prevRow];
+            rowSpacing = qMax(windowMargin, rowSpacing);
+        }
+    }
+}
+
+void QGridLayoutEngine::ensureEffectiveFirstAndLastRows() const
+{
+    if (q_cachedEffectiveFirstRows[Hor] == -1 && !q_items.isEmpty()) {
+        int rowCount = this->rowCount();
+        int columnCount = this->columnCount();
+
+        q_cachedEffectiveFirstRows[Ver] = rowCount;
+        q_cachedEffectiveFirstRows[Hor] = columnCount;
+        q_cachedEffectiveLastRows[Ver] = -1;
+        q_cachedEffectiveLastRows[Hor] = -1;
+
+        for (int i = q_items.count() - 1; i >= 0; --i) {
+            const QGridLayoutItem *item = q_items.at(i);
+
+            for (int j = 0; j < NOrientations; ++j) {
+                Qt::Orientation orientation = (j == Hor) ? Qt::Horizontal : Qt::Vertical;
+                if (item->firstRow(orientation) < q_cachedEffectiveFirstRows[j])
+                    q_cachedEffectiveFirstRows[j] = item->firstRow(orientation);
+                if (item->lastRow(orientation) > q_cachedEffectiveLastRows[j])
+                    q_cachedEffectiveLastRows[j] = item->lastRow(orientation);
+            }
+        }
+    }
+}
+
+void QGridLayoutEngine::ensureColumnAndRowData(const QLayoutStyleInfo &styleInfo) const
+{
+    if (q_cachedDataForStyleInfo == styleInfo)
+        return;
+
+    q_columnData.reset(columnCount());
+    q_rowData.reset(rowCount());
+
+    fillRowData(&q_columnData, styleInfo, Qt::Horizontal);
+    fillRowData(&q_rowData, styleInfo, Qt::Vertical);
+
+    q_columnData.distributeMultiCells();
+    q_rowData.distributeMultiCells();
+
+    q_totalBoxes[Hor] = q_columnData.totalBox(0, columnCount());
+    q_totalBoxes[Ver] = q_rowData.totalBox(0, rowCount());
+
+    q_cachedDataForStyleInfo = styleInfo;
+}
+
+void QGridLayoutEngine::ensureGeometries(const QLayoutStyleInfo &styleInfo,
+                                         const QSizeF &size) const
+{
+    ensureColumnAndRowData(styleInfo);
+    if (q_cachedSize == size)
+        return;
+
+    q_xx.resize(columnCount());
+    q_yy.resize(rowCount());
+    q_widths.resize(columnCount());
+    q_heights.resize(rowCount());
+    q_descents.resize(rowCount());
+    q_columnData.calculateGeometries(0, columnCount(), size.width(), q_xx.data(), q_widths.data(),
+                                     0, q_totalBoxes[Hor]);
+    q_rowData.calculateGeometries(0, rowCount(), size.height(), q_yy.data(), q_heights.data(),
+                                  q_descents.data(), q_totalBoxes[Ver]);
+
+    q_cachedSize = size;
+}
+
+QT_END_NAMESPACE
+        
+#endif //QT_NO_GRAPHICSVIEW
diff --git a/src/gui/graphicsview/qgridlayoutengine_p.h b/src/gui/graphicsview/qgridlayoutengine_p.h
new file mode 100644
index 0000000..acc96de
--- /dev/null
+++ b/src/gui/graphicsview/qgridlayoutengine_p.h
@@ -0,0 +1,449 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QGRIDLAYOUTENGINE_P_H
+#define QGRIDLAYOUTENGINE_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of the graphics view layout classes.  This header
+// file may change from version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "qalgorithms.h"
+#include "qbitarray.h"
+#include "qlist.h"
+#include "qmap.h"
+#include "qpair.h"
+#include "qvector.h"
+
+#include <float.h>
+
+QT_BEGIN_NAMESPACE
+
+class QGraphicsLayoutItem;
+class QStyle;
+class QWidget;
+
+// ### deal with Descent in a similar way
+enum {
+    MinimumSize = Qt::MinimumSize,
+    PreferredSize = Qt::PreferredSize,
+    MaximumSize = Qt::MaximumSize,
+    NSizes
+};
+
+// do not reorder
+enum {
+    Hor,
+    Ver,
+    NOrientations
+};
+
+// do not reorder
+enum LayoutSide {
+    Left,
+    Top,
+    Right,
+    Bottom
+};
+
+template <typename T>
+class QLayoutParameter
+{
+public:
+    enum State { Default, User, Cached };
+
+    inline QLayoutParameter() : q_value(T()), q_state(Default) {}
+    inline QLayoutParameter(T value, State state = Default) : q_value(value), q_state(state) {}
+
+    inline void setUserValue(T value) {
+        q_value = value;
+        q_state = User;
+    }
+    inline void setCachedValue(T value) const {
+        if (q_state != User) {
+            q_value = value;
+            q_state = Cached;
+        }
+    }
+    inline T value() const { return q_value; }
+    inline T value(T defaultValue) const { return isUser() ? q_value : defaultValue; }
+    inline bool isDefault() const { return q_state == Default; }
+    inline bool isUser() const { return q_state == User; }
+    inline bool isCached() const { return q_state == Cached; }
+
+private:
+    mutable T q_value;
+    mutable State q_state;
+};
+
+class QStretchParameter : public QLayoutParameter<int>
+{
+public:
+    QStretchParameter() : QLayoutParameter<int>(-1) {}
+
+};
+
+class QLayoutStyleInfo
+{
+public:
+    inline QLayoutStyleInfo() { invalidate(); }
+    inline QLayoutStyleInfo(QStyle *style, QWidget *widget)
+        : q_valid(true), q_style(style), q_widget(widget) {}
+
+    inline void invalidate() { q_valid = false; q_style = 0; q_widget = 0; }
+
+    inline QStyle *style() const { return q_style; }
+    inline QWidget *widget() const { return q_widget; }
+
+    inline bool operator==(const QLayoutStyleInfo &other)
+        { return q_style == other.q_style && q_widget == other.q_widget; }
+    inline bool operator!=(const QLayoutStyleInfo &other)
+        { return !(*this == other); }
+
+private:
+    bool q_valid;
+    QStyle *q_style;
+    QWidget *q_widget;
+};
+
+class QGridLayoutBox
+{
+public:
+    inline QGridLayoutBox()
+        : q_minimumSize(0), q_preferredSize(0), q_maximumSize(FLT_MAX),
+          q_minimumDescent(-1), q_minimumAscent(-1) {}
+
+    void add(const QGridLayoutBox &other, int stretch, qreal spacing);
+    void combine(const QGridLayoutBox &other);
+    void normalize();
+
+#ifdef QT_DEBUG
+    void dump(int indent = 0) const;
+#endif
+    // This code could use the union-struct-array trick, but a compiler
+    // bug prevents this from working.
+    qreal q_minimumSize;
+    qreal q_preferredSize;
+    qreal q_maximumSize;
+    qreal q_minimumDescent;
+    qreal q_minimumAscent;
+    inline qreal &q_sizes(int which)
+    {
+        qreal *t;
+        switch (which) {
+        case Qt::MinimumSize:
+            t = &q_minimumSize;
+            break;
+        case Qt::PreferredSize:
+            t = &q_preferredSize;
+            break;
+        case Qt::MaximumSize:
+            t = &q_maximumSize;
+            break;
+        case Qt::MinimumDescent:
+            t = &q_minimumDescent;
+            break;
+        case (Qt::MinimumDescent + 1):
+            t = &q_minimumAscent;
+            break;
+        default:
+            t = 0;
+            break;
+        }
+        return *t;
+    }
+    inline const qreal &q_sizes(int which) const
+    {
+        const qreal *t;
+        switch (which) {
+        case Qt::MinimumSize:
+            t = &q_minimumSize;
+            break;
+        case Qt::PreferredSize:
+            t = &q_preferredSize;
+            break;
+        case Qt::MaximumSize:
+            t = &q_maximumSize;
+            break;
+        case Qt::MinimumDescent:
+            t = &q_minimumDescent;
+            break;
+        case (Qt::MinimumDescent + 1):
+            t = &q_minimumAscent;
+            break;
+        default:
+            t = 0;
+            break;
+        }
+        return *t;
+    }
+};
+
+bool operator==(const QGridLayoutBox &box1, const QGridLayoutBox &box2);
+inline bool operator!=(const QGridLayoutBox &box1, const QGridLayoutBox &box2)
+    { return !operator==(box1, box2); }
+
+class QGridLayoutMultiCellData
+{
+public:
+    inline QGridLayoutMultiCellData() : q_stretch(-1) {}
+
+    QGridLayoutBox q_box;
+    int q_stretch;
+};
+
+typedef QMap<QPair<int, int>, QGridLayoutMultiCellData> MultiCellMap;
+
+class QGridLayoutRowData
+{
+public:
+    void reset(int count);
+    void distributeMultiCells();
+    void calculateGeometries(int start, int end, qreal targetSize, qreal *positions, qreal *sizes,
+                             qreal *descents, const QGridLayoutBox &totalBox);
+    QGridLayoutBox totalBox(int start, int end) const;
+    void stealBox(int start, int end, int which, qreal *positions, qreal *sizes);
+
+#ifdef QT_DEBUG
+    void dump(int indent = 0) const;
+#endif
+
+    QBitArray ignore;   // ### rename q_
+    QVector<QGridLayoutBox> boxes;
+    MultiCellMap multiCellMap;
+    QVector<int> stretches;
+    QVector<qreal> spacings;
+    bool hasIgnoreFlag;
+};
+
+class QGridLayoutEngine;
+
+class QGridLayoutItem
+{
+public:
+    QGridLayoutItem(QGridLayoutEngine *engine, QGraphicsLayoutItem *layoutItem, int row, int column,
+                    int rowSpan = 1, int columnSpan = 1, Qt::Alignment alignment = 0);
+
+    inline int firstRow() const { return q_firstRows[Ver]; }
+    inline int firstColumn() const { return q_firstRows[Hor]; }
+    inline int rowSpan() const { return q_rowSpans[Ver]; }
+    inline int columnSpan() const { return q_rowSpans[Hor]; }
+    inline int lastRow() const { return firstRow() + rowSpan() - 1; }
+    inline int lastColumn() const { return firstColumn() + columnSpan() - 1; }
+
+    int firstRow(Qt::Orientation orientation) const;
+    int firstColumn(Qt::Orientation orientation) const;
+    int lastRow(Qt::Orientation orientation) const;
+    int lastColumn(Qt::Orientation orientation) const;
+    int rowSpan(Qt::Orientation orientation) const;
+    int columnSpan(Qt::Orientation orientation) const;
+    void setFirstRow(int row, Qt::Orientation orientation = Qt::Vertical);
+    void setRowSpan(int rowSpan, Qt::Orientation orientation = Qt::Vertical);
+
+    int stretchFactor(Qt::Orientation orientation) const;
+    void setStretchFactor(int stretch, Qt::Orientation orientation);
+
+    inline Qt::Alignment alignment() const { return q_alignment; }
+    inline void setAlignment(Qt::Alignment alignment) { q_alignment = alignment; }
+
+    QSizePolicy::Policy sizePolicy(Qt::Orientation orientation) const;
+    QSizePolicy::ControlTypes controlTypes(LayoutSide side) const;
+    QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint = QSizeF()) const;
+    QGridLayoutBox box(Qt::Orientation orientation, qreal constraint = -1.0) const;
+    QRectF geometryWithin(qreal x, qreal y, qreal width, qreal height, qreal rowDescent) const;
+
+    QGraphicsLayoutItem *layoutItem() const { return q_layoutItem; }
+
+    void setGeometry(const QRectF &rect);
+    void transpose();
+    void insertOrRemoveRows(int row, int delta, Qt::Orientation orientation = Qt::Vertical);
+    QSizeF effectiveMaxSize() const;
+
+#ifdef QT_DEBUG
+    void dump(int indent = 0) const;
+#endif
+
+private:
+    QGridLayoutEngine *q_engine;   // ### needed?
+    QGraphicsLayoutItem *q_layoutItem;
+    int q_firstRows[NOrientations];
+    int q_rowSpans[NOrientations];
+    int q_stretches[NOrientations];
+    Qt::Alignment q_alignment;
+};
+
+class QGridLayoutRowInfo
+{
+public:
+    inline QGridLayoutRowInfo() : count(0) {}
+
+    void insertOrRemoveRows(int row, int delta);
+
+#ifdef QT_DEBUG
+    void dump(int indent = 0) const;
+#endif
+
+    int count;
+    QVector<QStretchParameter> stretches;
+    QVector<QLayoutParameter<qreal> > spacings;
+    QVector<Qt::Alignment> alignments;
+    QVector<QGridLayoutBox> boxes;
+};
+
+class QGridLayoutEngine
+{
+public:
+    QGridLayoutEngine();
+    inline ~QGridLayoutEngine() { qDeleteAll(q_items); }
+
+    int rowCount(Qt::Orientation orientation) const;
+    int columnCount(Qt::Orientation orientation) const;
+    inline int rowCount() const { return q_infos[Ver].count; }
+    inline int columnCount() const { return q_infos[Hor].count; }
+    // returns the number of items inserted, which may be less than (rowCount * columnCount)
+    int itemCount() const;
+    QGridLayoutItem *itemAt(int index) const;
+
+    int effectiveFirstRow(Qt::Orientation orientation = Qt::Vertical) const;
+    int effectiveLastRow(Qt::Orientation orientation = Qt::Vertical) const;
+
+    void setSpacing(qreal spacing, Qt::Orientations orientations);
+    qreal spacing(const QLayoutStyleInfo &styleInfo, Qt::Orientation orientation) const;
+    // ### setSpacingAfterRow(), spacingAfterRow()
+    void setRowSpacing(int row, qreal spacing, Qt::Orientation orientation = Qt::Vertical);
+    qreal rowSpacing(int row, Qt::Orientation orientation = Qt::Vertical) const;
+
+    void setRowStretchFactor(int row, int stretch, Qt::Orientation orientation = Qt::Vertical);
+    int rowStretchFactor(int row, Qt::Orientation orientation = Qt::Vertical) const;
+
+    void setStretchFactor(QGraphicsLayoutItem *layoutItem, int stretch,
+                          Qt::Orientation orientation);
+    int stretchFactor(QGraphicsLayoutItem *layoutItem, Qt::Orientation orientation) const;
+
+    void setRowSizeHint(Qt::SizeHint which, int row, qreal size,
+                        Qt::Orientation orientation = Qt::Vertical);
+    qreal rowSizeHint(Qt::SizeHint which, int row,
+                      Qt::Orientation orientation = Qt::Vertical) const;
+
+    void setRowAlignment(int row, Qt::Alignment alignment, Qt::Orientation orientation);
+    Qt::Alignment rowAlignment(int row, Qt::Orientation orientation) const;
+
+    void setAlignment(QGraphicsLayoutItem *layoutItem, Qt::Alignment alignment);
+    Qt::Alignment alignment(QGraphicsLayoutItem *layoutItem) const;
+    Qt::Alignment effectiveAlignment(const QGridLayoutItem *layoutItem) const;
+
+
+    void addItem(QGridLayoutItem *item);
+    void removeItem(QGridLayoutItem *item);
+    QGridLayoutItem *findLayoutItem(QGraphicsLayoutItem *layoutItem) const;
+    QGridLayoutItem *itemAt(int row, int column, Qt::Orientation orientation = Qt::Vertical) const;
+    inline void insertRow(int row, Qt::Orientation orientation = Qt::Vertical)
+        { insertOrRemoveRows(row, +1, orientation); }
+    inline void removeRow(int row, Qt::Orientation orientation = Qt::Vertical)
+        { insertOrRemoveRows(row, -1, orientation); }
+
+    void invalidate();
+    void setGeometries(const QLayoutStyleInfo &styleInfo, const QRectF &contentsGeometry);
+    QRectF cellRect(const QLayoutStyleInfo &styleInfo, const QRectF &contentsGeometry, int row,
+                    int column, int rowSpan, int columnSpan) const;
+    QSizeF sizeHint(const QLayoutStyleInfo &styleInfo, Qt::SizeHint which,
+                    const QSizeF &constraint) const;
+    QSizePolicy::ControlTypes controlTypes(LayoutSide side) const;
+    void transpose();
+    void setVisualDirection(Qt::LayoutDirection direction);
+    Qt::LayoutDirection visualDirection() const;
+#ifdef QT_DEBUG
+    void dump(int indent = 0) const;
+#endif
+
+private:
+    static int grossRoundUp(int n) { return ((n + 2) | 0x3) - 2; }
+
+    void maybeExpandGrid(int row, int column, Qt::Orientation orientation = Qt::Vertical);
+    void regenerateGrid();
+    inline int internalGridRowCount() const { return grossRoundUp(rowCount()); }
+    inline int internalGridColumnCount() const { return grossRoundUp(columnCount()); }
+    void setItemAt(int row, int column, QGridLayoutItem *item);
+    void insertOrRemoveRows(int row, int delta, Qt::Orientation orientation = Qt::Vertical);
+    void fillRowData(QGridLayoutRowData *rowData, const QLayoutStyleInfo &styleInfo,
+                     Qt::Orientation orientation = Qt::Vertical) const;
+    void ensureEffectiveFirstAndLastRows() const;
+    void ensureColumnAndRowData(const QLayoutStyleInfo &styleInfo) const;
+    void ensureGeometries(const QLayoutStyleInfo &styleInfo, const QSizeF &size) const;
+
+    // User input
+    QVector<QGridLayoutItem *> q_grid;
+    QList<QGridLayoutItem *> q_items;
+    QLayoutParameter<qreal> q_defaultSpacings[NOrientations];
+    QGridLayoutRowInfo q_infos[NOrientations];
+    Qt::LayoutDirection m_visualDirection;
+
+    // Lazily computed from the above user input
+    mutable int q_cachedEffectiveFirstRows[NOrientations];
+    mutable int q_cachedEffectiveLastRows[NOrientations];
+
+    // Layout item input
+    mutable QLayoutStyleInfo q_cachedDataForStyleInfo;
+    mutable QGridLayoutRowData q_columnData;
+    mutable QGridLayoutRowData q_rowData;
+    mutable QGridLayoutBox q_totalBoxes[NOrientations];
+
+    // Output
+    mutable QSizeF q_cachedSize;
+    mutable QVector<qreal> q_xx;
+    mutable QVector<qreal> q_yy;
+    mutable QVector<qreal> q_widths;
+    mutable QVector<qreal> q_heights;
+    mutable QVector<qreal> q_descents;
+
+    friend class QGridLayoutItem;
+};
+
+QT_END_NAMESPACE
+
+#endif